US-20x20 RM EN
D01268420A
US-20x20
USB Audio MIDI Interface with Mic Pre/Mixer
REFERENCE MANUAL
Before connecting this unit to a computer, you must download and install dedicated software on the computer.
Contents
1 – Introduction...............................................3
Features................................................................................... 3
Conventions used in this manual................................... 3
2 – Names and functions of parts...................4
Front panel............................................................................. 4
Rear panel............................................................................... 5
3 – Installation.................................................6
System requirements......................................................... 6
Windows........................................................................... 6
Mac..................................................................................... 6
iOS devices...................................................................... 6
Supported audio drivers............................................ 6
Installing the dedicated software.................................. 6
Installing the Windows driver................................... 7
Installing the Mac Settings Panel............................ 8
Working with Gatekeeper.......................................... 8
Uninstalling the dedicated software..................... 9
4 – Preparation...............................................10
Attaching the rack mount angles................................10
Connecting the power.....................................................10
Changing the outlet plug.........................................10
5 – Connections.............................................. 11
Examples of connections with other equipment... 11
Computer connections....................................................12
Audio connections............................................................12
Microphones.................................................................12
Guitar...............................................................................13
Electronic devices and other audio
equipment.....................................................................13
Analog record players...............................................13
Monitor speakers.........................................................13
Headphones..................................................................13
MIDI connections...............................................................13
Connecting with iOS devices.........................................13
6 – Using the Settings Panel.........................14
Opening the Settings Panel...........................................14
Windows OS..................................................................14
Mac OS X........................................................................14
Settings Panel overview..................................................14
MIXER page..........................................................................15
EQUALIZER (4-band parametric EQ) display
area overview...............................................................18
COMPRESSOR display area overview...................19
REVERB display area overview................................19
LINK button overview................................................20
INTERFACE page.................................................................21
Status display area......................................................21
Setting area...................................................................21
OUTPUT SETTING page....................................................22
Using the Settings Panel View menu..........................23
Initializing the Settings Panel.................................23
2 TASCAM
US-20x20
Resetting the reverb settings.................................24
Using the SceneMemory menu....................................25
Saving Settings Panel settings...............................25
Loading Settings Panel settings............................26
Changing scene memory names..........................26
Resetting all scene memories.................................27
Saving Settings Panel settings to the unit.........27
7 – Operation modes.....................................28
Using the unit as a microphone preamp...................28
Changing the sampling frequency in mic
preamp mode...............................................................28
Input and output channels in mic preamp
mode...............................................................................29
Using the unit in audio interface mode.....................29
Changing the sampling frequency in audio
interface mode.............................................................29
Using the unit in digital mixer mode..........................29
The sampling frequency can be changed in
digital mixer mode.....................................................29
8 – Application Guide....................................30
DAW software.....................................................................30
Windows Media Player.....................................................30
Windows 10...................................................................30
Windows 8.....................................................................30
Windows 7.....................................................................31
Mac OS X and iTunes.........................................................31
iOS...........................................................................................31
9 – MIDI Implementation Chart....................32
10 – Troubleshooting....................................33
11 – Specifications.........................................36
Ratings...................................................................................36
Input/output ratings.........................................................36
Analog inputs...............................................................36
Analog outputs............................................................36
Digital audio input/output ratings.......................36
Control input/output ratings..................................37
Audio performance....................................................37
Computer system requirements..................................37
Windows.........................................................................37
Mac OS X........................................................................38
iOS devices....................................................................38
Supported audio drivers..........................................38
General..................................................................................38
Dimensional drawings.....................................................39
Block diagrams....................................................................40
Mic preamp mode......................................................40
Audio interface mode................................................41
Digital mixer mode.....................................................42
Level diagrams....................................................................43
1 – Introduction
Features
• Ultra-HDDA (High Definition Discrete Architecture) mic
preamps with −125dBu EIN
• 8 Ultra-HDDA mic preamps, 8 XLR/TRS inputs and 2 TRS
input jacks
• Three switchable modes: interface, mic preamp, mixer
• Support for high-resolution recording formats up to
24-bit/192kHz
• Supports Windows and Mac
• Connect with computers using USB 3.0 (Windows 10 only)
• Connect with iOS devices including iPad
• Can provide +48V phantom power
• Supports direct guitar input.
• Input level specifications boast a 56dB range and support
dynamic mic input
• Tough metal casing can endure even hard use
• Angled design provides excellent usability on a desktop
• Two 70mW+70mW standard TRS headphone output jacks
• Separate controls for line and headphone output volumes
• MIDI input and output enable connection with keyboards
and other MIDI devices
• Low latency monitoring through the DSP mixer
• DSP mixer with 4-band EQ and compression on each input
channel (usable in interface and mixer modes)
• Patch bay allows outputs to be assigned freely (usable in
interface and mixer modes)
• Ten scene memories (can be renamed) for saving DSP mixer
settings
• Ten analog TRS output jacks
• S/PDIF COAXIAL digital input and output jacks
• TOSLINK multichannel optical digital input and output
connectors (support SMUX2/SMUX4)
• BNC word clock input and output connectors
• Supports USB Audio Class 2.0
• Operation confirmed with major DAW software, including
Sonar, ProTools, Cubase, Live, Studio One and GarageBand
• Product compliant with RoHS
• Rack mount adapters and hex key included
• AC adapter included
Conventions used in this manual
In this manual, we use the following conventions:
• Switches, connectors and other physical parts of this unit
are written using a bold font like this: PHONES knob.
• Information shown on a computer display is written like
this: “OK”.
• As necessary, additional information is provided under TIP,
NOTE and CAUTION headings.
TIP
These are tips about how to use the unit.
NOTE
These provide additional explanations and describe special
cases.
CAUTION
Failure to follow these instructions could result in injury,
damage to equipment or lost recording data, for example.
88 Note about computer operation
If you are unsure about anything related to the basic operation
of a computer when it is mentioned in an explanation in this
manual, please refer to the computer operation manual.
TASCAM US-20x20
3
2 – Names and functions of parts
Front panel
1 STANDBY/ON switch and indicator
Press to turn the unit on and to put it into standby. The
STANDBY/ON indicator lights green when the unit is on.
2 MODE button and indicators
Use to change the operation mode. (See “7 – Operation
modes” on page 28.)
MIC PRE
This lights when the unit is operating as a microphone
preamp.
AUDIO I/F
This lights when the unit is operating as an audio
interface.
MIXER
This lights when the unit is operating as a digital mixer.
4 MIC/INST IN1–IN2 jacks (balanced/unbalanced)
These analog inputs are XLR/TRS combo jacks.
They support high impedance input, including direct guitar
input.
oo XLR (1: GND, 2: HOT, 3: COLD)
oo TRS (Tip: HOT, Ring: COLD, Sleeve: GND)
Use the gain knobs to set input gains.
5 MIC/LINE IN3–IN8 jacks (balanced)
These analog inputs are XLR/TRS combo jacks.
These jacks support line input from audio equipment and
keyboards, for example.
oo XLR (1: GND, 2: HOT, 3: COLD)
NOTE
If the signal stops being input from the sample clock source
set by the Sample Clock Source item on the “INTERFACE”
page or synchronization with it becomes impossible, this
unit's sample clock will become unlocked and the indicator
for the set operation mode will blink. (See “Setting area” on
page 21.)
3 Phantom power switches
Use these switches to provide +48V phantom power to the
IN1–IN4 and IN5–IN8 jacks.
You can change the Phantom power setting for four
channels of inputs at a time. Phantom power is supplied
when the switch is set to +48V.
oo TRS (Tip: HOT, Ring: COLD, Sleeve: GND)
Use the gain knobs to set input gains.
6 Signal/overload indicators
These light red when signals are about to distort (−1 dBFS)
and the light green when signals are being input (−32 dBFS
or higher).
7 Gain knobs
Use these knobs to adjust the gains of IN1–IN8
independently.
The gains of IN1–IN8 can each be set in a range between
−12 dBu and −68 dBu.
8 LINE OUT 1–2 knob
CAUTION
• Do not connect or disconnect mics when the phantom
power switch is set to +48V. Doing so could cause a
loud noise and might damage this unit and connected
equipment.
• Set the phantom power switch to +48V only when using
a condenser microphone that requires phantom power.
Setting phantom power to +48V when a dynamic mic
or other mic that does not require it is connected could
damage this unit and connected equipment.
• When using condenser mics that require phantom power
and dynamic mics together, be sure to use balanced
dynamic mics. Unbalanced dynamic mics cannot be used
when phantom power is enabled.
• Supplying phantom power to some ribbon mics will break
them. If you are unsure, do not supply phantom power to a
ribbon mic.
• Set the LINE OUT 1–2 and PHONES 1/2 knobs to their
minimum values before changing a phantom power
switch setting. Failure to do so could cause sudden loud
4 TASCAM
noises from monitoring equipment, and this could damage
equipment or harm hearing.
US-20x20
Use to adjust the output level of the LINE OUT 1–2 jacks on
the back of the unit.
9 PHONES 1/2 knobs
Use to adjust the output levels of the PHONES 1/2 jacks.
CAUTION
Before connecting headphones to a jack, minimize its
PHONES knob. Failure to do so might cause sudden loud
noises, which could harm your hearing or result in other
trouble.
0 USB indicator
This lights orange when the USB connection is enabled.
q PHONES 1/2 jacks
Use these standard stereo jacks to connect stereo
headphones. The same signal is output from the LINE OUT
1/2 jacks.
Use an adapter to connect headphones with a mini plug.
2 – Names and Functions of Parts
Rear panel
w COAXIAL IN jack
This digital audio input jack complies with the S/PDIF
standard.
e USB port
Use the included USB cable to connect the unit to a
computer or iOS device (supports USB 2.0/3.0).
CAUTION
• The included USB cable (USB 2.0 or USB 3.0) that can be used
depends on the the computer and OS you are using. (See
“Computer connections” on page 12.)
• USB 1.1 is not supported.
r OPTICAL (S/MUX) IN/OUT connectors
These input and output multichannel digital audio in optical
format.
44.1, 48, 88.2, 96, 176.4 and 192kHz sampling frequencies
are supported.
SMUX2 is supported for 88.2/96kHz formats, and SMUX4 is
supported for 176.4/192kHz formats.
t MIDI OUT connector
This 5-pin DIN is a standard MIDI output jack.
This outputs MIDI signals.
y MIDI IN connector
This 5-pin DIN is a standard MIDI input jack.
Use this to input MIDI signals.
u WORD IN/OUT connectors
These BNC connectors are for the input and output of word
clock signals.
Word clock signals of 44.1, 48, 88.2, 96, 176.4 and 192 kHz
can be input and output.
CAUTION
o LINE IN 9-10 (BALANCED) jacks and LEVEL switch
These standard TRS jacks are line inputs. (Tip: HOT, Ring:
COLD, Sleeve: GND)
Use the LEVEL switch to set the nominal level to −10dBV or
+4dBu.
NOTE
The input gain cannot be adjusted for these jacks.
p COAXIAL OUT jack
This digital audio input jack complies with S/PDIF and AES/
EBU standards.
Set the digital signal format on the “INTERFACE” page of the
Settings Panel.
a LINE OUT (BALANCED) 1–10 jacks
These standard TRS jacks are analog line outputs. The
nominal output level is +4 dBu.
(Tip: HOT, Ring: COLD, Sleeve: GND)
s AUTO POWER SAVE switch
Use this switch to have the unit turn itself off automatically
(start standby) when operating in mic preamp mode if no
input signal above −60 dBFS is detected for 30 minutes.
CAUTION
If you want to turn the unit on again after it has turned itself
off (started standby) automatically, press the STANDBY/
ON button once, wait at least 8 seconds and then press the
STANDBY/ON button again.
d Cord holder
Hook the cord of the included AC adapter here to prevent
accidental disconnection.
f DC IN 12V connector
Connect the included AC adapter (GPE248-120200-Z) here.
If a digital system has multiple word clock masters, serious
problems, including damage to equipment, could occur.
i 75Ω ON/OFF/THRU/WORD OUT switch
Use this switch to make the following settings.
• Whether or not the WORD IN connector has 75Ω
termination
• WORD output THRU/OUT setting (OUT is for WORD only)
TASCAM US-20x20
5
3 – Installation
System requirements
Check the TEAC Global Site (http://teac-global.com/) for the
latest information about supported operating systems.
Windows
88 Supported operating systems
Windows 10 32-bit
Windows 10 64-bit
Windows 8 (including 8.1) 32-bit
Windows 8 (including 8.1) 64-bit
Windows 7 32-bit SP1 or later
Windows 7 64-bit SP1 or later
88 Computer hardware requirements
Windows computer with a USB 2.0 or USB 3.0 port
88 CPU/processor speed
2 GHz or faster dual core processor (x86)
88 Memory
2 GB or more
88 Display resolution
1280×800 or greater
Mac
88 Supported operating systems
OS X Yosemite (10.10.1 or later)
OS X Mavericks (10.9.5)
OS X Mountain Lion (10.8.5)
88 Computer hardware requirements
Mac with a USB 3.0 or USB 2.0 port
88 CPU/processor speed
2 GHz or faster dual core processor
88 Memory
2 GB or more
88 Display resolution
1280×800 or greater
CAUTION
The included USB cable (USB 2.0 or USB 3.0) and the USB
specification that can be used depends on the the computer
and OS you are using.(See “Computer connections” on page
12.)
iOS devices
Device made by Apple Inc. running iOS 7 or later
CAUTION
• The included USB cable (USB 2.0 or USB 3.0) and the USB
specification that can be used depend on the computer and
OS you are using. (See “Computer connections” on page
12.)
• Operation of this unit was confirmed using standard
computers that meet the above requirements. This does
not guarantee operation with all computers that meet the
above requirements. Even computers that meet the same
system requirements might have processing capabilities
that differ according to their settings and other operating
conditions
NOTE
Since noise could occur depending on the computer system
used, we recommend selecting “High performance” in the
Power Options Control Panel.
Supported audio drivers
88 Windows
USB Audio Class 2.0, ASIO 2.0, WDM (MME), MIDI
88 Mac
Core Audio, Core MIDI
Installing the dedicated software
To use this unit with a computer, dedicated software must be
installed on the computer.
Download the latest software for the operating system you are
using from the TEAC Global Site (http://teac-global.com/).
• To use this unit with a Windows computer, install the
Windows driver.
When you install the Windows driver, the Windows Settings
Panel application will be installed at the same time.
• To use this unit with a Mac, install the Mac Settings Panel
application.
The standard OS driver will be used.
• When using this unit with an iOS device, the standard OS
driver will be used, so there is no need to install dedicated
software.
CAUTION
Before starting to install software, quit other applications.
6 TASCAM
US-20x20
3 – Installation
Installing the Windows driver
7. Click the “Install (I)” button.
CAUTION
• Complete installation of the Windows driver on the
computer before connecting the unit to it with the USB
cable.
• If you already connected the unit to the computer using
the USB cable before installing the Windows driver and the
Found New Hardware Wizard launched, close the message
and disconnect the USB cable.
88 Windows driver installation procedures
1. Download the latest Windows driver for the operating
system you are using from the TEAC Global Site (http://
teac-global.com/) and save it on the computer to be used
with the unit.
2. Open the saved Windows driver (zip file) on, for example, the
computer desktop.
3. Double-click the “US-20x20_Installer” file in the folder that
appears after uncompression to automatically launch the
installation software.
8. Next, click the “Install (I)” button to start installation.
9. The following screen appears when installation has
completed.
Click the “Finish (F)” button.
CAUTION
If you open a zip file without uncompressing it and doubleclick the “US-20x20_Installer.exe” file in the folder that
opens, installation will not start. Right-click the zip file and
select “Extract All", for example, to uncompress it and then
try again.
4. When a “Security Warning” or “User Account Control” screens
appear, click the “Yes” button.
5. When the InstallShield Wizard screen appears, click the “Next
(N)” button.
The installer will quit and the Windows Settings Panel will
launch.
NOTE
6. Read the contents of the License Agreement, and select
“Agree (A)” if you agree to the terms. Then, click the “Next
(N)” button.
After installing the driver, the device driver will be installed
the first time the unit is connected by USB. At this time,
Windows will automatically search Windows Update, and
it may take some time to recognize the unit connection.
If the unit is still not recognized after some time, open the
software installation screen from the message area at
the bottom right of the computer display, and click “Skip
Obtaining Drivers From Windows Update” to cancel the
search.
TASCAM US-20x20
7
3 – Installation
Installing the Mac Settings Panel
NOTE
• Install the Mac Settings Panel on the computer before
connecting the unit to it with the USB cable.
• During installation of the Mac Settings Panel, a warning
message such as “'US-20x20.pkg' can't be opened because
it was not downloaded from the Mac App Store.” might
appear. If a message like this appears, follow the instructions in “Working with Gatekeeper” on page 8 and then
proceed with the installation.
6. Next, click the “Install” button to start installation.
88 Mac Settings Panel installation procedures
1. Download the latest Mac Settings Panel for the operating
system you are using from the TEAC Global Site (http://
teac-global.com/) and save it on the computer to be used
with the unit.
2. Double-click “US-20x20_Installer.dmg", which is the saved
disk image file for the Mac Settings Panel, and double-click
“US-20x20.pkg” inside the folder that opens.
7. The following screen appears when installation has
completed.
Click the “Close” button.
NOTE
Depending on the computer’s settings, the downloaded zip
file might not have opened automatically. In this case, open
the zip file first and then double-click the disk image file.
3. When the installer starts, click the “Continue” button.
The Mac Settings Panel will launch.
Working with Gatekeeper
4. Next, select the desired language and click the “Continue”
button.
When using Mac OS X, depending on the Gatekeeper security
function setting, a warning message might appear during
installation.
The solution depends on the warning message shown.
See the following explanations for details.
88 When the Gatekeeper setting is “Allow applications
downloaded from: the Mac App Store"
The following security warning might be shown: “US-20x20.
pkg' can't be opened because it was not downloaded from
the Mac App Store."
5. Click the “Read License” button and check the contents
of the Software License Agreement. If you agree to the
contents, click “Agree”.
Then, click the “Next” button.
8 TASCAM
US-20x20
In this case, click the OK button to close the message. Then,
control-click (or right-click) the file and click “Open”.
3 – Installation
When the “'US-20x20.pkg' can't be opened because it was
not downloaded from the Mac App Store. Are you sure you
want to open it?” security warning message appears, click
the “Open” button.
Uninstalling the dedicated software
NOTE
Normally, there is no need to uninstall a driver or Settings
Panel. Follow these procedures if a problem occurs or you no
longer intend to use the unit with the computer.
88 Windows
This warning message might also appear when the
Gatekeeper setting is something other than “Allow applications downloaded from: the Mac App Store”.
The file still might not open and “'US-20x20.pkg' can't be
opened because it was not downloaded from the Mac App
Store.” might appear again.
In this case, copy the file from the folder where it is to the
desktop or another folder, and then open it. Alternatively,
change the Gatekeeper setting to “Allow applications
downloaded from: the Mac App Store and identified developers” and try opening it again.
88 Changing the Gatekeeper setting
Uninstall from the “Programs and Features” Control Panel.
1. From the Start menu, open the Control Panel application,
click Programs and then click Programs and Features.
NOTE
• In Windows 10, right-click the Start button and click the
Control Panel that appears.
• In Windows 8, to open the Control Panel, right-click the
Start screen and click the All apps button (or  button that
appears at the bottom left of the screen in Windows 8.1).
2. If “View by:” is set to “Category", click “Uninstall a program”
under the “Program” item.
If “View by:” is set to “Large icons” or “Small icons", click
“Programs and Features”.
3. Double-click “TASCAM US-20x20 version X.XX” ("X.XX” is the
driver software version) in the list.
4. Then, follow the instructions that appear on the screen.
88 Mac
Delete “US-20x20” from the Application folder to complete
uninstallation.
The Gatekeeper setting can be changed using the “Allow
applications downloaded from:” item on the “General” page
of the “Security & Privacy” pane of the System Preferences.
To change this, you must click the lock icon ( ) at the
bottom left and enter a password to unlock the settings.
This setting will lock again when you quit the System Preferences by typing command-Q or clicking the button, for
example, or when you click the “Show All” button to close
the open pane.
CAUTION
Changing the Gatekeeper setting could result in security
risks.
If you changed the Gatekeeper setting to decrease security
(use one of the lower settings), set it back to the original
setting after updating the driver and/or firmware.
TASCAM US-20x20
9
4 – Preparation
Attaching the rack mount angles
In order to prevent the cord from becoming disconnected
during use, wrap it around the cord holder when connecting it.
Before mounting this unit in a rack, you must remove the frame
pieces and install the included rack mount angles. Follow these
procedures to attach the rack mount angles. (Prepare a Phillips
screwdriver in advance.)
1. Use the hex key included with this product to remove the
four screws from each side frame as shown in the illustration
below.
CAUTION
2. Remove the frames from both ends of the unit.
3. Use the Phillips screwdriver that you prepared to attach the
included rack mount angles using the included rack mount
angle installation screws.
Always use the AC adapter (GPE248-120200-Z) that was
shipped with the unit. Using a different AC adapter could
cause malfunction, overheating, fire or other problems.
NOTE
The AC adapter for the unit includes two types of outlet
plugs. Attach the type of plug that matches the power outlet
that you are using. (See “Changing the outlet plug” on page
10.)
Changing the outlet plug
3
NOTE
2
Reverse these procedures to reinstall the frames that were
originally attached to the unit.
1
Connecting the power
Use the included AC adapter (GPE248-120200-Z) to connect a
power supply to the unit as shown below.
$
5
%
4
1 Move the latch on the AC adapter in the direction of
the arrow.
2 Pull off the outlet plug.
3 R
eplace it with the other outlet plug (A or B).
4 Move the latch on the AC adapter in the direction of
Power outlet
the arrow again.
5 Attach the outlet plug to the AC adapter.
GPE248-120200-Z (included)
DC plug
After changing the outlet plug, confirm that it is not loose
or crooked and that everything is normal before plugging it
into an outlet
CAUTION
Do not use the adapter if there is anything abnormal about
the plug after changing it. Use when the plug is abnormal
could cause fire or electric shock. Contact the retailer where
you purchased the unit or a TEAC service center (on the back
cover) to request repair.
10 TASCAM
US-20x20
5 – Connections
Examples of connections with other equipment
Guitar
Drums
Bass Guitar
Headphones
Sound module
Digital recorder
Powered speakers or
amplifier and speakers
Computer
Drum machine
Example using a US-20x20
CAUTION
• Before making connections, turn this unit and all equipment to be connected off (standby).
• The phantom power switches set four input channels at a time. Do not set phantom power to +48V when connecting an unbalanced
dynamic mic.
• Do not connect or disconnect mics while phantom power is set to +48V. Doing so could cause a loud noise and might damage this
unit and connected equipment.
• Set the LINE OUT 1–2 and PHONES 1/2 knobs to their minimum values before changing a phantom power switch setting. Failure to
do so could cause sudden loud noises from monitoring equipment, and this could damage equipment or harm hearing.
• Supplying phantom power to some ribbon mics will break them. If you are unsure, do not supply phantom power to a ribbon mic.
TASCAM US-20x20
11
5 – Connections
Computer connections
Audio connections
Two types of USB cables (USB 2.0 or USB 3.0) are included.
Use an included USB cable to connect the unit to a computer
USB 2.0 or USB 3.0 port according to the computer and OS that
you are using.
When the USB connection is working, the USB indicator on the
front of the unit lights.
Check the TEAC Global Site (http://teac-global.com/) for the
latest information about supported operating systems.
88 Windows
Supported operating
systems
Windows 10 32-bit
Windows 10 64-bit
Windows 8 (including
8.1) 32-bit
Windows 8 (including
8.1) 64-bit
Windows 7 32-bit SP1 or
later
Windows 7 64-bit SP1 or
later
USB standard
USB 2.0 USB 3.0
ü
ü*
ü
ü*
ü
-
ü
-
ü
-
ü
-
USB cable
connected
USB 3.0 cable*
USB 2.0 cable
USB 2.0 cable
USB 2.0 cable
88 Mac
USB standard
USB 2.0 USB 3.0
USB cable
connected
ü
-
USB 2.0 cable
ü
-
USB 2.0 cable
ü
-
USB 2.0 cable
CAUTION
If you connect this unit to a computer via a USB hub, for
example, audio signal dropouts, clicking noises and other
interference could occur due to the influence of other USB
devices connected to that hub. For this reason, we strongly
recommend connecting this unit to a separate USB port.
Connecting USB keyboards and mice, however, to the same
bus should not be a problem.
12 TASCAM
US-20x20
CAUTION
Before connecting audio equipment, set the unit’s 1–8
gain, LINE OUT 1-2 and PHONES 1/2 knobs to their lowest
values. Failure to do so could cause sudden loud noises
from monitoring equipment, and this could damage the
equipment or harm hearing.
Microphones
88 Dynamic mics
Connect to the IN1–IN8 jacks on the front of the unit.
88 Condenser mics
* Connect with the included USB 3.0 cable to use the USB 3.0
standard.
Supported operating
systems
OS X Yosemite (10.10.1
or later)
OS X Mavericks (10.9.5)
OS X Mountain Lion
(10.8.5)
Analog audio signals input into this device from mics, guitars,
keyboards and other audio equipment can be converted into
digital signals and transmitted to the computer via USB. In
addition, by connecting speakers (through an amplifier if not
powered) or headphones to this unit, you can monitor audio
signals that are input to this unit and output from the computer.
When using a condenser microphone that requires phantom
power, connect it to an IN1–IN8 jack and then set the
phantom power switch to +48V.
CAUTION
• Before making connections, turn this unit and all equipment
to be connected off (standby).
• The phantom power switches set four input channels at a
time. Do not set phantom power to +48V when connecting
a mic that does not require phantom power.
• Set the LINE OUT 1–2 and PHONES 1/2 knobs to their
minimum values before changing a phantom power
switch setting. Failure to do so could cause sudden loud
noises from monitoring equipment, and this could damage
equipment or harm hearing.
• Do not connect or disconnect mics when the phantom
power switch is set to +48V. Doing so could cause a
loud noise and might damage this unit and connected
equipment.
• Set the phantom power switch to +48V only when using
a condenser microphone that requires phantom power.
Setting phantom power to +48V when a dynamic mic
or other mic that does not require it is connected could
damage this unit and connected equipment.
• When using condenser mics that require phantom power
and dynamic mics together, be sure to use balanced
dynamic mics. Unbalanced dynamic mics cannot be used
when phantom power is enabled.
• Supplying phantom power to some ribbon mics will break
them. If you are unsure, do not supply phantom power to a
ribbon mic.
5 – Connections
Guitar
When connecting a guitar or bass guitar directly to this unit, use
the IN1 or IN2 jack on the front of the unit.
Electronic devices and other audio
equipment
Connect electronic instruments and other audio equipment
to the IN3–IN8 jacks on the front of the unit and the IN9–
IN10 jacks on the back of the unit. Set the LEVEL switch for
the the IN9–IN10 jacks to −10dBV when connecting unbalanced equipment and to +4dBu when connecting balanced
equipment.
Analog record players
The output of an analog record player cannot be connected
directly to this unit. To connect an analog record player to this
unit, a phono amp and equalizer (or an audio amplifier that has
phono input jacks) must be connected between them.
Monitor speakers
Connect monitor speakers (powered speakers or an amplifier
and speaker system) to the LINE OUT 1-2 jacks on the back of
the unit.
Use the LINE OUT 1-2 knob on the front of the unit to adjust the
speaker volume.
Headphones
Connect headphones to the PHONES 1 and PHONES 2 jacks
(standard stereo) on the front of the unit.
CAUTION
MIDI connections
Connect sound modules, keyboards, synthesizers, drum
machines and other MIDI devices to the unit in the following
manner.
• If you want to monitor sound from a MIDI device, connect
its outputs to the IN1–IN8 jacks on the front of the unit or
the IN9–IN10 jacks on the back of the unit. You could also
use an external mixer for monitoring.
• You can also use the MIDI IN and MIDI OUT connectors
on the back of the unit to send and receive MIDI timecode
(MTC). By doing this, you can use an application that
supports MTC to synchronize a multitrack recorder (MTR)
and MIDI devices.
CAUTION
When using Windows Media Player, if the “Sound and Audio
Devices Properties” Control Panel “MIDI music playback
(default device)” is set to “Microsoft GS Wavetable SW
Synth", you will not be able to hear MIDI performances
through this unit's LINE OUT 1–10, PHONES 1, PHONES 2,
COAXIAL OUT and OPTICAL (S/MUX) OUT connectors.
Connecting with iOS devices
You can use a Lightning to USB Camera Adapter* to connect the
unit to an iOS device and use it as an interface with that device.
* *You will need to prepare an Apple genuine Lightning to USB
Camera Adapter (sold separately).
NOTE
• When connected, this unit will not provide power to the iOS
device.
• iOS does not support 176.4/192kHz sampling frequencies.
Before connecting headphones, minimize the volumes with
the PHONES 1 and PHONES 2 knobs. Failure to do so might
cause sudden loud noises, which could harm your hearing
or result in other trouble.
TASCAM US-20x20
13
6 – Using the Settings Panel
You can use the Settings Panel to change and save settings for
the various functions of the unit.
Opening the Settings Panel
Open the Settings Panel installed on the computer to view it on
the computer display.
You can open the Settings Panel in the following ways.
NOTE
The Settings Panel cannot be used with an iPad or other iOS
device.
Windows OS
88 Select the Settings Panel from “All Programs” or “All
Windows 7
1. Click the Start button and select “Control Panel” to open the
Control Panel.
2. If the Control Panel is showing categories, set the “View by:”
item to “Large icons (L)” or “Small icons (S)”.
3. Select “US-20x20 Settings Panel” and open the Settings
Panel.
Mac OS X
• Using the Finder, open the Applications folder and
double-click “US-20x20 Settings Panel” to open the Settings
Panel.
• In the Audio Devices window of the Audio MIDI Setup
application, right-click (control-click) “US-20x20” (or click
the settings icon when the unit name is selected) and click
“Configure device…” to open the Settings Panel.
apps"
Settings Panel overview
Windows 10
Right-click the Start button w All Programs w select
“US-20x20 Settings Panel” under TASCAM and open the
Settings Panel.
Windows 8
In Windows 8, right-click the Start screen and click the “All
apps” button (in Windows 8.1, the  button that appears at
the bottom left of the Start screen) to open the Apps screen.
On this screen, click the “US-20x20 Settings Panel” item
under “TASCAM” and open the Settings Panel.
Windows 7
Start button w All Programs w select “US-20x20
Settings Panel” under TASCAM and open the Settings Panel.
88 In Windows 8, select “US-20x20 Settings Panel” on
the Start screen and open the Settings Panel.
NOTE
In Windows 8.1, the application is not automatically added
to the Start screen.
88 Open the Settings Panel from the Control Panel.
Windows 10
1. Right-click the Start button and select “Control Panel” to
open the Control Panel.
2. If the Control Panel is showing categories, set the “View by:”
item to “Large icons (L)” or “Small icons (S)”.
3. Select “US-20x20 Settings Panel” and open the Settings
Panel.
Windows 8
1. In Windows 8, right-click the Start screen and click the “All
apps” button (or  button that appears at the bottom left of
the screen in Windows 8.1), and click “Control Panel” to open
it.
2. If the Control Panel is showing categories, set the “View by:”
item to “Large icons (L)” or “Small icons (S)”.
3. Select “US-20x20 Settings Panel” and open the Settings
Panel.
NOTE
In Windows 8, you can also open the Control Panel by, for
example, clicking the Control Panel item in the menu that
appears if you right-click the bottom left corner of the
desktop.
14 TASCAM
US-20x20
The Settings Panel has three tabbed pages.
Click a tab at the top of the Settings Panel to open that page.
“MIXER”: Make built-in mixer and effect settings.
“INTERFACE”: Shows the current status of the driver and
information about connections. Make various settings.
“OUTPUT SETTING”: Make output settings.
CAUTION
When you open the Settings Panel, the setting values on
each page (“MIXER”, “INTERFACE”, and “OUTPUT SETTING”)
will be the same as when last closed, but they have not
been saved in a scene memory. To save settings in a scene
memory, use the Scene Memory menu. (See “Using the
SceneMemory menu” on page 25.)
6 – Using the Settings Panel
MIXER page
Windows Settings Panel screen
NOTE
When the unit is in MIC PRE mode, you cannot make settings
on the “MIXER” page even if you click the “MIXER” tab. (See
“Using the unit as a microphone preamp” on page 28.)
1EQUALIZER
This unit has a 4-band equalizer (with HIGH, HIGH MID, LOW
MID and LOW bands).
Use the equalizer to increase or decrease the levels of
specific frequency ranges. This can be used, for example,
to enhance the sound of individual instruments, to adjust
the balance of a wide frequency range and to cut specific
unwanted frequencies. (See “EQUALIZER (4-band parametric
EQ) display area overview” on page 18.)
Click the Select (5) button of a channel to make equalizer
settings for it.
Equalizer settings are shown here for the channel selected
using its Select (5) button.
“MIXER” page channels 1–2
TASCAM US-20x20
15
6 – Using the Settings Panel
2COMPRESSOR
When the input volume exceeds the THRESHOLD level,
the input volume is compressed, reducing output volume
variation.
For example, by reducing the levels of sounds that are high
level, lower level sounds become relatively louder, creating
a more even volume level throughout and a more sustained
sound. (See “COMPRESSOR display area overview” on page
19.)
Click the Select (5) button of a channel to make
compressor settings for it.
Compressor settings are shown here for the channel
selected using its Select (5) button.
NOTE
• If the input is a stereo signal (stereo-linked channel or
master), compression will start and be applied to both
channels when either the left or right input channel exceeds
the threshold level.
• When the compressor is off, the compressor curve will
appear but the meters will not be active.
8 COMP buttons
Use these to turn the compressor on/off for each channel.
Click a COMP button to activate the compressor for that
channel. The COMP button will light and the COMPRESSOR
(2) display area will show the active compressor settings.
NOTE
The compressor cannot be turned on if the sampling
frequency is 176.4/192kHz.
9 Effects AUX selection buttons
Set whether the signal sent to the AUX bus is pre-fader or
post-fader.
The selected button lights.
PRE button unlit
POST button unlit
(default)
PRE button lit
3Mode
This shows the operation mode of the unit set using the
MODE button on its front panel.
POST button lit
4REVERB
This effect adds reverberations to the original sound.
Multiple sounds are delayed at various times with damping
over time that is as natural as possible to produce reverberations like those of a hall, live-music club or studio, for
example. (See “REVERB display area overview” on page
19.)
5 Select buttons
Click this button for a channel to show the equalizer and
compressor settings for that channel.
Settings cannot be shown for more than one channel at a
time.
Off (default): Select button unlit
ON: Select button lit
Activate one of these buttons to show the equalizer and
compressor settings for that channel in the EQUALIZER (1)
and COMPRESSOR (2) display areas.
To select a different channel, click that channel's button. The
previously selected channel button will become unlit, and
the newly selected channel button will light.
6 PHASE buttons
Use these to change the phases of the signals on each
channel.
If the phase becomes reversed due to the wiring of microphones or other causes, click these buttons to reverse the
phases of those channels.
PHASE button unlit (default)
Normal
PHASE button lit
Reversed
7 EQ buttons
Use these to turn the equalizer on/off for each channel.
Click an EQ button to activate the equalizer for that channel.
The EQ button will light and the EQUALIZER (1) display area
will show the active equalizer settings.
NOTE
The equalizer cannot be turned on if the sampling frequency
is 176.4/192kHz.
16 TASCAM
US-20x20
The signal is not sent to the AUX bus.
The signal is sent to the AUX bus
before adjustment by the channel
fader.
The AUX level will not be affected by
the channel fader.
The signal is sent to the AUX bus after
adjustment by the channel fader.
The AUX level will be affected by the
channel fader.
0 AUX 1–4 knobs and indicators
Use to adjust the levels of the signals sent to the AUX bus
(AUX levels).
Range: inf to 6 dB (default: inf )
Use the mouse to click and drag an AUX knob up or down to
adjust that AUX level.
While dragging the mouse, the value being adjusted is
shown below and to the right of the AUX knob.
The indicator lights blue at levels of 0 dB or less and yellow
at levels from 0 dB to 6 dB.
q SOLO buttons
The SOLO buttons change according to the current mode.
When the unit is in AUDIO I/F mode, if a channel is
soloed (SOLO button turned on), channels that have not
been soloed will automatically be muted (in place solo
monitoring).
When the unit is in MIXER mode, channels that are soloed
(SOLO buttons turned on) will be sent to the SOLO bus and
channels that have not been soloed will automatically be
muted (PFL solo monitoring).
The MUTE buttons of muted channels will light. (Default: off )
Multiple channels can also be soloed at the same time when
the unit is in AUDIO I/F or MIXER mode.
NOTE
• When the unit is in AUDIO I/F mode and all the SOLO
buttons are off, clicking a SOLO button will solo that
channel and automatically mute the other channels,
lighting their MUTE buttons.
• When the unit is in AUDIO I/F mode if every SOLO button is
turned off, channels that had been automatically muted
will become unmuted. Channels that had been individually
muted before any channel was soloed will remain muted.
• The MASTER L/R channel MUTE button will not turn on
automatically when the unit enters solo mode.
6 – Using the Settings Panel
w MUTE buttons
Click a MUTE button to mute that channel. These buttons
light for channels that are muted. (Default: off )
NOTE
In addition to turning the MUTE button on and off, channels
will be automatically muted and unmuted when SOLO
buttons are used
e Pan sliders
Use to adjust the stereo positions of the signals input to
each channel.
Use the mouse to click and drag a pan slider left or right to
adjust the stereo position.
While dragging the mouse, the adjusted position is shown
above the channel level fader (t).
The value is L20 when set all the way to the left, R20 when
set all the way to the right and C when centered.
Setting range: L20–L1, C (default value), R1–R20 (41
steps total)
The pan slider appears blue when centered (C) and yellow at
all other positions.
NOTE
• When the pan slider is centered (C), signals are reduced by 3
dB and sent to the left and right buses.
• Double-click the pan slider to return it to the center (C)
position.
• When the pan slider is at the left end (L20), the signal is sent
only to the left bus of the stereo bus. It is not sent to the right
bus.
• When the pan slider is at the right end (R20), the signal is
sent only to the right bus of the stereo bus. It is not sent to
the left bus.
r Channel faders
Use these to adjust the levels of the signals sent from each
channel to the stereo bus.
Range: −infinity to 6 dB (default: −infinity)
Use the mouse to click and drag a channel fader up or down
to adjust its level.
The gain value of the channel fader is shown in the fader
level display area (y).
NOTE
Double-click the fader to set it to 0 dB.
t Channel level meters
These meters show the signal levels of each channel.
The channel level meters appear green at levels of -12 dB or
less, yellow at levels from −12 dB to −6 dB and red at levels
above −6 dB.
Each level meter has an overload indicator at its top.
NOTE
The channel meters show the levels before being adjusted
by the faders. Level meters are not affected by fader adjustments or even their channels being muted.
y Fader level display areas
These show the levels of the channel faders above them as
decibel values.
u LINK buttons
Click a LINK button to unite odd and even channels as a
single stereo channel. When linked, this button lights for
those channels. (Default: unlit)
When a pair is stereo linked, the buttons and knobs of the
channels are combined. The channel level meters are also
shown is a stereo pair.
See “LINK button overview” on page 20 for details.
i Channel notes
You can input up to six alphanumeric characters.
oo Character input
Click one of these areas. The cursor will blink when ready
for input.
When the unit is ready, use a computer keyboard to
input characters.
When done inputting, press the computer Enter key to
confirm.
oo When done inputting characters, you must press the
computer Enter key to confirm. If you do not press the
Enter key, the input characters will continue to be shown
but will not be saved when you switch to a different page
from the “MIXER” page.
o REVERB button
Click the REVERB button to apply reverb. (Default: on)
When the reverb is on, the REVERB button lights.
NOTE
The reverb cannot be turned on if the sampling frequency is
176.4/192kHz.
p RETURN knob and indicator
Use to adjust the return level, which is the signal from the
reverb effect returned to the stereo bus.
Range: inf to 6 dB (default: inf )
Use the mouse to click and drag the Return knob up or
down to adjust the level.
While dragging the mouse, the value being adjusted is
shown to the bottom right of the RETURN knob.
The indicator lights blue at levels of 0 dB or less and yellow
at levels from 0 dB to 6 dB.
a AUX MASTER 1/REVERB knob and indicator
Use this to adjust the send master level of the signal sent to
the AUX 1 bus and reverb effect.
Range: inf to 6 dB (default: 0 dB)
Use the mouse to click and drag the 1/REVERB knob up or
down to adjust the send level.
While dragging the mouse, the value being adjusted is
shown below and to the right of the 1/REVERB knob.
The indicator lights blue at levels of 0 dB or less and yellow
at levels from 0 dB to 6 dB.
TASCAM US-20x20
17
6 – Using the Settings Panel
s AUX MASTER 2–4 knobs and indicators
Use these to adjust the send master levels of the signals sent
to the AUX 2–4 buses.
Range: inf to 6 dB (default: 0 dB)
Use the mouse to click and drag the 2–4 knobs up or down
to adjust the send levels.
While dragging the mouse, the value being adjusted is
shown below and to the right of the 2–4 knobs.
The indicator lights blue at levels of 0 dB or less and yellow
at levels from 0 dB to 6 dB.
EQUALIZER (4-band parametric EQ) display
area overview
Use this to increase or decrease the levels of specific frequency
ranges. This can be used, for example, to enhance the sound
of individual instruments, to adjust the balance of a wide
frequency range and to cut specific unwanted frequencies.
d STEREO MASTER fader
Use to adjust the level of the output signal.
Use the mouse to click and drag the master fader up or
down to adjust the master level.
The value being being adjusted is shown in the master fader
level display area (g).
f STEREO MASTER level meters
The master levels are shown by this stereo level meter.
The STEREO MASTER level meters appear green at levels of
-12 dB or less, yellow at levels from -12 dB to -6 dB and red at
levels above -6 dB.
Each level meter has an overload indicator at its top.
The equalizer has a high-shelf HIGH band, a low-shelf LOW band
and peaking (bell-shaped) HIGH MID and LOW MID bands.
1 EQ graph
The frequency response at the current settings is shown as
a graph.
The graph is shown even when the equalizer is off.
2 GAIN (HIGH/HIGH MID/LOW MID/LOW) knobs
NOTE
The master level meters show the levels after being adjusted
by the fader (post fader). The level meters are affected by
fader adjustments and channels being muted.
g STEREO MASTER fader level display area
This shows the level of the master fader as a numerical
decibel value.
Set the amount the levels are increased or decreased for the
HIGH, HIGH MID, LOW MID and LOW bands.
Range: ±12 dB (default: 0 dB)
3 FREQ (HIGH/HIGH MID/LOW MID/LOW) knobs
Set the cutoff frequencies of the HIGH, HIGH MID, LOW MID
and LOW bands.
Ranges
HIGH: 1.7 kHz – 18.0 kHz (default: 5 kHz)
HIGH MID: 32 Hz – 18.0 kHz (default: 1.2 kHz)
LOW MID: 32 Hz – 18.0 kHz (default: 300 Hz)
LOW: 32 Hz – 1.6 kHz (default: 80 Hz)
4 Q (HIGH MID/LOW MID) knobs
Set the acutenesses of the peaks of the HIGH MID and LOW
MID bands.
The higher the value the more acute it becomes, making it
affect a narrower frequency band. The lower the value, the
less acute it becomes, making it affect a broader frequency
band.
Ranges
HIGH MID: 0.25 – 16.00 (default: 1.00)
LOW MID: 0.25 – 16.00 (default: 1.00)
5 LCF button
Click the LCF button to enable a low cut filter that cuts noise
and other sounds at low frequencies. The LCF button lights
when enabled. (Default: off )
18 TASCAM
US-20x20
6 – Using the Settings Panel
COMPRESSOR display area overview
When the input volume exceeds the THRESHOLD level, the input
volume is compressed, reducing output volume variation.
For example, by reducing the levels of sounds that are high
level, lower level sounds become relatively louder, creating
a more even volume level throughout and a more sustained
sound.
REVERB display area overview
This effect adds reverberations to the original sound. Multiple
sounds are delayed at various times with damping over time
that is as natural as possible to produce reverberations like
those of a hall, live-music club or studio, for example.
1 Reverb status display
1 Compressor status display
Three meters show the level of the signal input to the
compressor (INPUT), the level of the signal output from the
compressor (OUTPUT) and the gain reduction caused by the
compressor (GR).
2 THRESHOLD knob
Sets the threshold level that will cause the compressor to
start.
Range: −32 dB – 0 dB (default: 0 dB)
3 RATIO knob
Sets the compression ratio for the input volume.
Turning it right raises the compression ratio, increasing the
amount of compression.
Range: 1.0:1 – inf:1 (default: 1.0:1)
4 GAIN knob
Sets the gain of the output signal.
When the volume is compressed, the output level becomes
lower than the input level. Use the GAIN knob to increase
the output level so that it is close to the input level.
Range: 0 dB – 20 dB (default: 0 dB)
This shows the setting status of the PRE DELAY and REVERB
TIME knobs.
2 Reverb type switch
Use to select the type of reverb.
Depending on the type, the density and level of the reverb
sound changes.
Options: HALL (default), ROOM, LIVE, STUDIO, PLATE
3 PRE DELAY knob
Set the amount of delay until the first reverberations.
The larger the value, the larger the reverberations make the
room sound.
Range: 0 ms – 250 ms (default: 90 ms)
4 REVERB TIME knob
Set the amount of time that the reverberations continue.
The larger the value, the longer they continue.
Range: 0.1 s – 10 s (default: 2.7 s)
5 DIFFUSION knob
Sets the breadth of the reverberations.
Range: 0 – 100 (default: 20)
5 ATTACK knob
Sets the amount of time until the compression reaches the
compression RATIO setting after the input volume exceeds
the threshold.
Range: 2 ms – 200 ms (default: 2 ms)
6 RELEASE knob
Sets the amount of time until the compression stops and
the sound returns to its uncompressed level after the input
sound goes below the threshold.
Range: 10 ms – 1000 ms (default: 10 ms)
NOTE
• If the input is a stereo signal (stereo-linked channel or
master), compression will start and be applied to both
channels when either the left or right input channel exceeds
the threshold level.
• When the compressor is off, the compressor curve will
appear but the meters will not be active.
TASCAM US-20x20
19
6 – Using the Settings Panel
LINK button overview
When a LINK button on the “MIXER” page is turned on/off, the
settings differ according to whether the stereo link is enabled or
disabled.
The details of the settings are as follows.
88 When a LINK button is turned on
Button/knob
Select buttons
PHASE buttons
EQ buttons
COMP buttons
Effect AUX selection
buttons
AUX knobs (1–4)
SOLO buttons
MUTE buttons
Pan sliders
Channel faders
Channel level meters
Fader level display areas
Setting status
On if a Select button was on (lit) for
either channel.
Off if the Select buttons were off
(unlit) for both channels.
Settings are not combined.
Both channels retain their previous
settings.
The setting of the odd channel is
used for both.
The setting of the odd channel is
used for both.
The setting of the odd channel is
used for both.
The setting of the odd channel is
used for both.
The setting of the odd channel is
used for both.
The setting of the odd channel is
used for both.
Settings are not combined.
Odd and even channels can each be
set independently.
The setting of the odd channel is
used for both.
The channel level meters are shown
as a stereo pair.
The setting of the odd channel is
shown.
NOTE
When a LINK button is turned on (lit), the select button
name changes to a name used when the stereo link is active.
Examples
When the “M/INST 1” and “M/INST 2” buttons are linked,
the name of the button changes to “M/INST 1-2”.
20 TASCAM
US-20x20
88 When a LINK button is turned off
Button/knob
Select buttons
PHASE buttons
EQ buttons
COMP buttons
Effect AUX selection
buttons
AUX knobs (1–4)
SOLO buttons
MUTE buttons
Pan sliders
Channel faders
Channel level meters
Fader level display areas
Setting status
If the Select button was on (lit) for
either channel, the odd channel will
be turned on and the even channel
will be turned off.
If the Select buttons were off (unlit)
for both channels, they will both
stay off.
Settings do not change. Both
channels retain their previous
settings.
Both channels use the settings they
shared when stereo-linked.
Both channels use the settings they
shared when stereo-linked.
Both channels use the settings they
shared when stereo-linked.
Both channels use the settings they
shared when stereo-linked.
If a SOLO button was on (lit) when
stereo-linked, this button will be on
for both channels.
If the SOLO buttons were off (unlit)
for both channels, they will both
stay off.
If a MUTE button was on (lit) when
stereo-linked, this button will be on
for both channels.
If the MUTE buttons were off (unlit)
for both channels, they will both
stay off.
Both channels use the settings they
shared when stereo-linked.
Both channels use the settings they
shared when stereo-linked.
The channel level meters are shown
independently again.
These setting values of each
channel are shown.
6 – Using the Settings Panel
INTERFACE page
Status display area
This shows the current status of the unit.
88 Windows
Status display area
Setting area
Item displayed
Meaning
Software Version
Sample Rate
Version of the software being used
Version of the firmware used by
the unit
Unit model
Name of the currently selected
clock source
Current sampling frequency
Digital Input Status
Current status of digital input
Firmware Version
Device
Clock Source
Depending on the status of the digital input, the following will
appear for the Digital Input Statusitem.
Item
displayed
Lock
Windows “INTERFACE” page in AUDIO I/F mode
Unlock
Meaning
A valid digital signal is being input.
No valid digital signal is being detected.
NOTE
Status display area
Setting area
• ("No Device” is shown for the “Firmware Version” and
“Device” items when the unit and the computer are not
connected.)
• "No ASIO Driver” is show for the “Sample Rate” item if no
ASIO driver has been installed.
Setting area
1 Sample Clock Source
Mac “INTERFACE” page in AUDIO I/F mode
The “INTERFACE” page is divided into two areas. One shows the
status of the unit and the other shows settings.
An image of the rear panel of the unit is shown at the bottom
of the page so you can check the layout of connectors, for
example. (No setting changes or other operations are possible
using this image.)
Use this to set the sampling clock source.
Options:
COAXIAL
The clock signal input through the COAXIAL IN
connector is used.
OPTICAL(TASCAM Auto Mode)
The clock signal input through the OPTICAL IN
connector is used.
If the connected device is a TASCAM device, the input
clock signal will be automatically identified and set.
OPTICAL(44.1kHz/48kHz/88.2kHz/96kHz)
The clock signal input through the OPTICAL IN
connector is used.
Use this setting if the connected device is not a
TASCAM device and the input clock signal is 44.1, 48,
88.2 or 96 kHz.
OPTICAL(176.4kHz/192kHz)
The clock signal input through the OPTICAL IN
connector is used.
Use this setting if the connected device is not a
TASCAM device and the input clock signal is 176.4 or
192 kHz.
WORD
The clock signal input through the WORD IN connector
is used.
INTERNAL
The unit's built-in clock is always used.
NOTE
• When set to COAXIAL, OPTICAL or WORD, if no signal is
input through the corresponding connector or synchroniTASCAM US-20x20
21
6 – Using the Settings Panel
zation becomes impossible, “Unlock” will appear for the
Digital Input Status item and the unit's MODE indicator will
blink.
• When connecting multiple digital devices to the US-20x20,
synchronize them to a system word clock and input word
clock supplied by the master clock device to the US-20x20.
OUTPUT SETTING page
2 Internal Sample Rate
Set the sampling frequency of the unit's internal clock.
Options: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz,
192kHz
NOTE
When the unit is in AUDIO I/F mode, you cannot set the
Internal Sample Rate.
3 Coaxial Digital Output Format
Use this to set the digital output format.
Options: S/PDIF, AES/EBU
Windows Settings Panel page in AUDIO I/F mode
4 Digital Input (176.k/192k Hz)
Use this to set the digital input destination. (Only when
176.4/192 kHz)
Options: COAXIAL, OPTICAL 1/2
5 Buffer Size (Windows only)
The Windows driver for the unit stores the audio signals
transferred to and from the computer temporarily in a
buffer. This buffer size can be adjusted.
Smaller buffer sizes result in less audio signal delay (latency),
but require high-speed processing by the computer.
If the processing cannot keep up, for example, due to other
system operations, clicking and popping noises might occur
and the audio signal might even drop out.
Increasing the buffer size will stabilize operation and
suppress negative effects on audio signals, but the delay in
audio signals sent to the computer will increase.
You can use the slider on the panel to adjust the buffer size,
according to the use conditions.
Use the slider to select fixed values that increase from left to
right.
Options: 64 Samples, 128 Samples, 256 Samples, 512
Samples, 1024 Samples, 2048 Samples
Windows Settings Panel page in MIXER mode
On the “OUTPUT SETTING” page, set the signal lines output from
the unit's output jacks.
NOTE
When the unit is in MIC PRE mode, you cannot change
settings in the output signal selection area of the “OUTPUT
SETTING” page. (See “Using the unit as a microphone
preamp” on page 28.)
1Mode
NOTE
When the unit is in MIC PRE or MIXER mode, you cannot set
the Buffer Size.
This shows the operation mode of the unit set using the
MODE button on its front panel.
2 Output signal selection area
Click the output signal selection area to open a pull-down
menu from which you can select the signal you want to
output from the options. The options shown depend on the
operation mode.
Options:
MASTER L/MASTER R
Output the L/R signals from the Stereo BUS
AUX 1–AUX 4
Output the signals from an AUX BUS (1–4)
COMPUTER 1–COMPUTER 20
When the operation mode is AUDIO I/F, signals are
output from Computer BUS (1–20)
SOLO L/SOLO R:
When the operation mode is MIXER, signals are output
from SOLO BUS (L/R).
22 TASCAM
US-20x20
6 – Using the Settings Panel
NOTE
The same signals are output from the PHONES 1 and
PHONES 2 jacks as the output signals selected in the output
signal selection area for LINE OUT 1 and LINE OUT 2.
3 Status display area
This shows the connections between the signals selected
in the output signal selection area (2) and the output
connectors.
Using the Settings Panel View menu
Initializing the Settings Panel
You can reset all settings in the Settings Panel.
NOTE
The items on the “INTERFACE” page cannot be initialized.
CAUTION
After resetting, you cannot restore the previous settings.
1. In the menu bar, open the View menu (Windows/Mac), and
click “Initialize”.
The following confirmation message will appear.
Use the View menu in the menu bar to reset the Settings
Panel and reverb settings to their original values, as well as to
minimize the Settings Panel.
Windows version
Windows version
Mac version
88 Initialize
Select this to reset all settings in the Settings Panel.
See “Initializing the Settings Panel” on page 23 for details.
88 Initialize Reverb
Select this to reset the settings in REVERB area on the
“MIXER” page.
See “Resetting the reverb settings” on page 24 for details.
88 Minimize
This minimizes the Settings Panel software to the Windows
Taskbar or Mac Dock.
88 Close
Close the Settings Panel and quit/exit the software.
2. Click the “OK” button in the message window to reset the
Settings Panel settings to their default values.
The items reset are as follows.
“MIXER” page items
oo EQUALIZER area settings: all initialized
oo COMPRESSOR area settings: all initialized
oo REVERB area settings: all initialized
oo PHASE buttons (all channels): off
oo EQ buttons (all channels): off
oo COMP buttons (all channels): off
oo Effect AUX selection buttons: off
oo AUX 1–4 knobs (all channels): inf
oo SOLO buttons (all channels): off
oo MUTE buttons (all channels): off
oo Pan sliders (all channels): center (C)
oo Channel faders (all channels): −infinity
oo LINK buttons (all channel pairs): off
oo REVERB buttons: on
oo RETURN knob: inf
oo AUX MASTER 1/REVERB knob: 0
oo AUX MASTER 2–4 knobs: 0
oo STEREO MASTER fader: −infinity
The following “OUTPUT SETTING” page items when the unit
is in AUDIO I/O mode
oo LINE OUT 1: COMPUTER 1
oo LINE OUT 2: COMPUTER 2
oo LINE OUT 3: COMPUTER 3
oo LINE OUT 4: COMPUTER 4
oo LINE OUT 5: COMPUTER 5
oo LINE OUT 6: COMPUTER 6
oo LINE OUT 7: COMPUTER 7
oo LINE OUT 8: COMPUTER 8
oo LINE OUT 9: COMPUTER 9
oo LINE OUT 10: COMPUTER 10
oo COAX L: COMPUTER 11
oo COAX R: COMPUTER 12
oo OPT 1: COMPUTER 13
oo OPT 2: COMPUTER 14
oo OPT 3: COMPUTER 15
oo OPT 4: COMPUTER 16
TASCAM US-20x20
23
6 – Using the Settings Panel
oo OPT 5: COMPUTER 17
oo OPT 6: COMPUTER 18
oo OPT 7: COMPUTER 19
oo OPT 8: COMPUTER 20
The following “OUTPUT SETTING” page items when the unit
is in MIXER mode
oo LINE OUT 1: MASTER L
oo LINE OUT 2: MASTER R
oo LINE OUT 3: AUX 1
oo LINE OUT 4: AUX 2
oo LINE OUT 5: AUX 3
oo LINE OUT 6: AUX 4
oo LINE OUT 7: AUX 1
oo LINE OUT 8: AUX 2
oo LINE OUT 9: AUX 3
oo LINE OUT 10: AUX 4
oo COAX L: MASTER L
oo COAX R: MASTER R
oo OPT 1: AUX 1
oo OPT 2: AUX 2
oo OPT 3: AUX 3
oo OPT 4: AUX 4
oo OPT 5: AUX 1
oo OPT 6: AUX 2
oo OPT 7: AUX 3
oo OPT 8: AUX 4
NOTE
• Click the “Cancel” button to return to the Settings Panel
without resetting.
• If you turn the unit on without launching the Settings Panel,
the default values for the “OUTPUT SETTING” page will be
used for the input and output settings.
• There is no iOS device Settings Panel, so the unit will operate
using the default values.
24 TASCAM
US-20x20
Resetting the reverb settings
You can reset the settings in the REVERB area on the “MIXER”
page.
CAUTION
After resetting, you cannot restore the previous settings.
1. In the menu bar, open the View menu (Windows/Mac), and
click “Initialize Reverb”.
The following confirmation message will appear.
Windows version
2. Click the “OK” button in the message window to reset the
reverb settings to their default values.
The items reset are as follows.
Reverb type
Reverb knobs
PRE DELAY
REVERB TIME DIFFUSION
HALL
90 ms
2.7 s
20
ROOM
25 ms
1.4 s
60
6 ms
2.6 s
50
STUDIO
60 ms
0.4 s
70
PLATE
42 ms
2.7 s
50
LIVE
The reverb type will also be set to HALL (default value).
NOTE
Click the “Cancel” button to return to the Settings Panel
without resetting.
6 – Using the Settings Panel
Using the SceneMemory menu
Use the “SceneMemory” menu to save the current Settings Panel
settings in a scene memory or to initialize those settings.
Saving Settings Panel settings
You can save the current Settings Panel settings as a scene
memory.
CAUTION
Only one set of Settings Panel settings can be saved in each
scene memory. For this reason, saving settings will erase the
previously saved settings.
1. Open the “SceneMemory” menu from the menu bar, and
click the name of the scene memory where you want the
settings to be saved to open a submenu.
2. Click “Save” in the submenu to save the current Settings
Panel settings to the selected scene memory.
Windows version
Windows version
Mac version
88 SceneMemory1–10 items
Use to save the current Settings Panel settings as a scene
memory. Ten scene memories have been prepared in
advance.
88 Initialize Memory item
Use to reset all scene memories to their default values. See
“Resetting all scene memories” on page 27 for details.
88 Save into the unit item
You can transfer the current Settings Panel settings to the
unit.
By transferring the settings saved in the Settings Panel to
the unit, you can use them to operate the unit in standalone
mode when it is not connected to a computer by USB.
See “Saving Settings Panel settings to the unit” on page 27
for details.
Mac version
NOTE
Select button settings on the “MIXER” page are not saved.
NOTE
The Buffer Size item on the “INTERFACE” page is not saved.
TASCAM US-20x20
25
6 – Using the Settings Panel
Loading Settings Panel settings
You can change the current Settings Panel settings by loading
settings stored in a scene memory.
CAUTION
After loading a scene memory, you cannot restore the
previous settings. You can save the current settings in a
different scene memory beforehand if you like.
1. Open the “SceneMemory” menu from the menu bar, and
click the name of the scene memory to be loaded to open a
submenu.
2. Click “Load” in the submenu to change the Settings Panel
settings to the settings in the selected scene memory.
Changing scene memory names
You can change the names of scene memories.
1. Open the “SceneMemory” menu from the menu bar, and
click the scene memory name that you want to change to
open a submenu.
2. Select “Rename” in the submenu.
Windows version
Windows version
Mac version
3. A window where you can change the scene memory name
will open.
Mac version
CAUTION
Windows version
A scene memory that has never been saved contains no
Settings Panel settings. If you try to load such a scene, the
following message will appear.
Windows version
26 TASCAM
US-20x20
4. Input a new name for the scene memory, and click the “OK”
button to confirm the change.
6 – Using the Settings Panel
Resetting all scene memories
You can reset the 10 scene memories to the default values.
CAUTION
After resetting, you cannot restore the previous settings.
1. In the menu bar, open the “SceneMemory” menu, and click
“Initialize Memory”.
Saving Settings Panel settings to the unit
You can save the current Settings Panel settings to the unit.
1. In the menu bar, open the “SceneMemory” menu, and click
“Save into the unit”.
Windows version
Windows version
Mac version
Mac version
2. The following confirmation message, which explains that all
the current Settings Panel settings will be saved to the unit,
will appear.
2. The following confirmation message, which explains that all
scene memories will be reset, will appear.
Windows version
Windows version
3. Click the “OK” button to initialize all the scene memories.
NOTE
3. Click the “OK” button on the screen to save all the current
Settings Panel settings to the unit memory.
NOTE
The Buffer Size item on the “INTERFACE” page is not saved.
Click the “Cancel” button to return to the Settings Panel
without initializing the 10 scene memories.
TASCAM US-20x20
27
7 – Operation modes
Press the MODE button on the front of the unit to change the
operation mode used.
The MODE indicator lights for the currently active operating
mode.
This unit has the following three operating modes.
• MIC PRE
The unit operates as a microphone preamp.
• AUDIO I/F
The unit operates as an audio interface.
• MIXER
The unit operates as a digital mixer.
Using the unit as a microphone
preamp
When the MIC PRE MODE indicator on the front of the unit is lit,
you can use the unit as a microphone preamp.
NOTE
• The default sampling frequency in mic preamp mode is 44.1
kHz.
• When the unit is in mic preamp mode, you cannot make
settings on the “MIXER” page. If you click the “MIXER” tab,
the following message will appear.
• When the unit is in mic preamp mode, you cannot change
settings in the output signal selection area of the “OUTPUT
SETTING” page. The following message will appear if you
try to change the settings. (See “OUTPUT SETTING page” on
page 22.)
28 TASCAM
US-20x20
Changing the sampling frequency in mic
preamp mode
Use the following settings to change the sampling frequency
(44.1 kHz by default) in mic preamp mode.
88 Windows
Control Panel w Sound window w Speakers TASCAM
US-20x20 w Properties (p) w US-20x20 Properties
Advanced tab w Default Format
88 Mac
Applications folder w Utilities folder w Audio MIDI Setup
w Audio Devices window w US-20x20 w Format
NOTE
In mic preamp mode, the sampling frequency can also be
changed from DAW software.
7 – Operation modes
Input and output channels in mic preamp mode
In mic preamp mode, the routings between input and output channels are fixed as shown below.
The input channels that can be output from the OPTICAL OUT jacks depends on the set sampling frequency.
Input
44.1/48 kHz
88.2/96 kHz
176.4/192 kHz
Output
MIC/INST IN1
MIC/INST IN1
MIC/INST IN1
LINE OUT 1
MIC/INST IN2
MIC/INST IN2
MIC/INST IN2
LINE OUT 2
MIC/LINE IN3
MIC/LINE IN3
MIC/LINE IN3
LINE OUT 3
MIC/LINE IN4
MIC/LINE IN4
MIC/LINE IN4
LINE OUT 4
MIC/LINE IN5
MIC/LINE IN5
MIC/LINE IN5
LINE OUT 5
MIC/LINE IN6
MIC/LINE IN6
MIC/LINE IN6
LINE OUT 6
MIC/LINE IN7
MIC/LINE IN7
MIC/LINE IN7
LINE OUT 7
MIC/LINE IN8
MIC/LINE IN8
MIC/LINE IN8
LINE OUT 8
MIC/INST IN1-2 + MIC/LINE IN3-8
MIC/INST IN1-2 + MIC/LINE IN3-4
MIC/INST IN1-2
OPTICAL OUT
MIC/INST IN1-2
MIC/INST IN1-2
MIC/INST IN1-2
COAXIAL OUT
MIC/INST IN1-2
MIC/INST IN1-2
MIC/INST IN1-2
LINE OUT 9-10
You can use the gain knobs of the channels to adjust each of their output levels.
NOTE
When shipped new from the factory, the LINE OUT 1–2 knobs are set at their minimum values, so no signals will be output from the
LINE OUT 1–2 jacks.
When using mic preamp mode, set the LINE OUT 1–2 knobs to their maximum values.
Using the unit in audio interface mode
When the AUDIO I/F MODE indicator on the front of the unit is
lit, you can use the unit as an audio interface.
NOTE
The default sampling frequency in audio interface mode is
44.1 kHz.
Changing the sampling frequency in audio
interface mode
Set it in the DAW software you are using.
Using the unit in digital mixer mode
When the MIXER MODE indicator on the front of the unit is lit,
you can use the unit as a digital mixer.
NOTE
The default sampling frequency in digital mixer mode is
44.1 kHz.
The sampling frequency can be changed in
digital mixer mode.
You can change the sampling frequency (44.1 kHz by default) in
digital mixer mode in the following manner.
88 Windows
Control Panel w Sound window w Speakers TASCAM
US-20x20 w Properties (p) w US-20x20 Properties
Advanced tab w Default Format
88 Mac
Applications folder w Utilities folder w Audio MIDI Setup
w Audio Devices window w US-20x20 w Format
NOTE
In digital mixer mode, the sampling frequency can also be
changed from DAW software.
TASCAM US-20x20
29
8 – Application Guide
In this chapter, we explain how to set some audio applications
for use with this unit.
DAW software
The ways that settings are made differ among DAWs.
When using a DAW, consult its operation manual.
Windows Media Player
Windows 10
1. Quit all applications, right-click the Start button menu and
open the Control Panel.
2. Open “Sound”.
Windows 8
1. Quit all applications and right-click the Start screen and then
click the All apps button to open the Apps screen.
NOTE
In Windows 8.1, click the  icon that appears at the bottom
left of the start screen to open the Apps screen.
2. Click Control Panel.
3. Click “Hardware and Sound", and then open the “Sound”
window.
4. On the Playback page, right-click “Speakers TASCAM
US-20x20", and click “Set as Default Device” in the pop-up
menu that appears.
When you do this, the green check mark (ü) appears next to
“Speakers TASCAM US-20x20”.
NOTE
If you do not see this item, click Hardware and Sound.
3. On the Playback page, right-click “Speakers TASCAM
US-20x20", and click “Set as Default Device” in the pop-up
menu that appears.
When you do this, the green check mark (ü) appears next to
“Speakers TASCAM US-20x20”.
NOTE
To use this unit as the recording device, open the
“Recording” page and use “Set as Default Device” for “Line
In TASCAM US-20x20”.
5. After completing the setting, click the OK button.
6. Launch Windows Media Player, select an audio file and start
playback.
NOTE
NOTE
To use this unit as the recording device, open the
“Recording” page and use “Set as Default Device” for “Line
In TASCAM US-20x20”.
4. After completing the setting, click the OK button.
5. Start Windows Media Player, select an audio file and begin
playback.
NOTE
• If you change the setting while Windows Media Player is
running, the software will not recognize that the device has
been changed. In this case, restart Windows Media Player.
• If you still cannot hear sound after making the settings and
completing the procedures above, restart the computer.
• If you make this setting, sound will be output through this
unit, but no sound will be output by the computer’s speakers
or headphone jack.
30 TASCAM
US-20x20
• If you change the setting while Windows Media Player is
running, the software will not recognize that the device has
been changed. In this case, restart Windows Media Player.
• If you still cannot hear sound after making the settings and
completing the procedures above, restart the computer.
• If you make this setting, sound will be output through
this unit, but no sound will be output from the computer’s
speakers or headphone jack.
8 – Application Guide
Windows 7
1. Quit all applications and open the Control Panel from the
Start button menu.
2. Open “Sound”.
NOTE
If you do not see this item, click Hardware and Sound.
Mac OS X and iTunes
1. Open the Utilities folder in the Applications folder, and
double-click “Audio MIDI Setup”. Then open the “Audio
Devices” window.
2. Click “US-20x20” to select it and right-click or control-click it.
Then, click “Use this device for sound output” in the pop-up
menu.
The speaker mark appears next to “US-20x20”.
3. On the Playback page, right-click “Speakers TASCAM
US-20x20", and click “Set as Default Device” in the pop-up
menu that appears.
When you do this, the green check mark (ü) appears next to
“Speakers TASCAM US-20x20”.
NOTE
To use this device as the recording device, select “Use this
device for sound input” for the “US-20x20”.
3. Launch iTunes, select an audio file and start playback.
NOTE
NOTE
To use this unit as the recording device, open the
“Recording” page and use “Set as Default Device” for “Line
In TASCAM US-20x20”.
4. After completing the setting, click the OK button.
5. Start Windows Media Player, select an audio file and begin
playback.
NOTE
• If you change the setting while Windows Media Player is
running, the software will not recognize that the device has
been changed. In this case, restart Windows Media Player.
• If you still cannot hear sound after making the settings and
completing the procedures above, restart the computer.
• If you make this setting, sound will be output through this
unit, but no sound will be output by the computer’s speakers
or headphone jack.
• On a Mac, when setting the sampling rate to 176.4/192kHz,
in “Audio MIDI” Setup set the input and output formats to
“12ch-24bit Integer” before changing the DAW sampling
frequency.
• Do not change the sampling frequency when YouTube,
iTunes or another application is playing back.
iOS
When using this unit with an iOS device, no special settings are
necessary. You can use the unit immediately after connecting it
to the device by USB.
NOTE
Connecting headphones or other equipment to the
headphone jack of the iOS device will interrupt USB communication with the unit.
TASCAM US-20x20
31
9 – MIDI Implementation Chart
88 MIDI Implementation Chart
Function
Basic channels
Transmit
Recognize
When power on
×
×
Settable
×
×
When power on
×
×
×
×
Thru
Thru
Messages
Mode
Remarks
Thru
Altered
....................
Range
×
×
Note on
×
×
Note off
×
×
Polyphonic
×
×
Channel
×
×
Pitch bend
×
×
Thru
Control change
×
×
Thru
×
×
Note number
Velocity
Aftertouch
Program change
Settable range
System exclusive
System common
System real-time
Other
....................
×
×
Position
×
×
Song select
×
×
Tune
×
×
Clock
×
×
Command
×
×
Local on/off
×
×
All notes off
×
×
Active sense
×
×
Reset
×
×
Notes
Mode 1: OMNI ON, POLY Mode 3: OMNI OFF, POLY 32 TASCAM
US-20x20
Mode 2: OMNI ON, MONO
Mode 4: OMNI OFF, MONO
–: YES
×: NO
Thru
Thru
Thru
Thru
Thru
Thru
Thru
10 – Troubleshooting
Please read this chapter if you are unable to use the unit
properly even after setting it up following the procedures in this
manual.
If you are still unable to resolve your problems please contact
TASCAM customer support (see the end of this manual) with the
following information about the operating environment and
details about the trouble.
88
•
•
•
•
•
•
•
•
Operating environment
Computer manufacturer
Model
CPU
Memory (RAM)
Operating system
Applications used
Antivirus software
Wireless LAN use
See the end of this document for contact information.
88 The dedicated software cannot be installed
1. Check the operating system
The operating system you are using might not be supported
by the software that you are trying to install.
Check the operating systems supported by the software that
you are trying to install.
2. Stop software that is running in the background
Antivirus software and other software running in the
background can interfere with installation. Quit software
running in the background and try installing again.
88 There is no sound even when playing back on the
computer.
The audio output must be set on the computer.
Please confirm the following while the unit is connected to the
computer. Moreover, if you make the following settings, sound
will be output through this unit, but no sound will be output by
the computer’s speakers or headphone jack.
Windows 10/Windows 8/Windows 7
See the “Windows Media Player” section in “8 – Application
Guide” on page 30 of this manual, and make settings for
the default playback device according to the OS.
Mac OS X
1. Quit all applications and open “System Preferences…” from
the Apple menu.
2. Open “Sound”.
3. On the Output tab, select “US-20x20”.
After completing the setting, restart the computer and check
the sound of playback. Depending on the application that you
are using, you might need to make additional device settings.
In particular, DAW applications operate using audio engines
with settings that are different from the OS settings, so confirm
the DAW settings first after installing the driver and Settings
Panel software for this unit.
Please see the manuals for the applications that you are using
for detailed setting procedures.
88 The unit is connected, but the computer does not
recognize it.
1. Install the dedicated software
oo If you have not done so, install the dedicated software.
(See “Installing the dedicated software” on page 6.)
2. Change the USB port
oo This unit will not work with USB 1.1. Use a USB 3.0 or USB
2.0 port.
oo Do not use a USB hub. Always connect the unit directly to
a USB port on the computer.
oo If the above steps do not resolve the problem, connect the
unit to a different USB port on the computer.
TASCAM US-20x20
33
10 – Troubleshooting
88 Sound breaks up or there is noise.
The processing load on the computer causes sound to break up
and noise to occur.
Here are some methods to reduce the load on the computer.
1. A wireless LAN and software running in the background,
including antivirus software, regularly put processing
loads on the computer, which can cause sound to break up
and other noise. Stop wireless LAN transmission, antivirus
software and other software running in the background
when using this unit.
2. Set the buffer size (latency) in the audio application that
you are using or in this unit's Settings Panel to a larger value
(Windows only).
NOTE
Consult the maker of the audio application that you are
using for methods to reduce its load on your computer.
3. Change the settings of your computer so that they are
optimal for audio processing.
Windows 10
1. Click the Start button and click “Explorer”.
2. Right-click “PC” and select “Properties”.
3. Click “Advanced system settings”.
4. Click “Settings” in the “Performance” section of the
“Advanced” tab of the “System Properties” window.
5. In the “Visual Effects” tab of the “Performance Options”
window, select “Adjust for best performance”.
Windows 8
1. In Windows 8, right-click the ordinary start screen
(Metro user interface screen) and then click “All apps”.
2. Right-click “Computer” and select “Properties”.
3. Click “Advanced system settings”.
4. Click “Settings” in the “Performance” section of the
“Advanced” tab of the “System Properties” window.
5. In the “Visual Effects” tab of the “Performance Options”
window, select “Adjust for best performance”.
Windows 7
a) Turn Aero off.
1. Right-click the desktop and select “Personalize”.
2. Select a “Basic” or “High Contrast” theme.
b) Performance settings
1. Right-click “Computer” and select “Properties”.
2. Click “Advanced system settings”.
3. Click “Settings” in the “Performance” section of the
“Advanced” tab of the “System Properties” window.
4. In the “Visual Effects” tab of the “Performance Options”
window, select “Adjust for best performance”.
34 TASCAM
US-20x20
Mac OS X
1. Open “System Preferences…” from the Apple menu,
and select “Energy Saver”.
2. Set “Computer sleep” to “Never”.
3. Set “Display sleep” to “Never”.
NOTE
Depending on the Mac OS X version and Mac computer
model, this setting might not be available.
4. Change the USB port
Since the unit might not properly function with some USB
ports, try connecting it to a different USB port.
NOTE
• Try again after disconnecting other USB devices. (Keyboards
and mice can be left connected.)
• Do not use a USB hub. Always connect the unit directly to a
USB port on the computer (built-in)
•
10 – Troubleshooting
88 I am using SONAR and the performance with my
88 I see that the US-20x20 recommends that I change
First, make sure that your audio interface is set to ASIO mode:
• Press P to open the Preferences window
• Click “Playback and Recording” from the left column
• Set the Driver Mode to ASIO
Windows allows the processor to throttle to half speed when
the computer is idle. However, this can affect the performance
of DAW recording software. TASCAM recommends that this
function be disabled, especially when using a multi-channel
interface such as the US-20x20.
To Change the Power Management settings in Windows:
TASCAM US-20x20 interface is not very good. How
do I fix this?
the Windows Power Management settings. How do I
do this?
• Open the Control Panel.
• In Windows 10, right-click the Start button and click the
Control Panel that appears.
• In Windows 8 (including 8.1) this is under “Settings” in
the right pane of the desktop
• In Windows 7 and earlier this is in your Start menu
• Open the Power Options control panel by double-clicking it
• Click “Show Additional Plans”
• Click on “High Performance” in the Power Options
If you still have problems, change the Buffer Size in the US-20x20
Settings panel:
• Open the US-20x20 Settings panel
• Click the Interface tab
• Change the Buffer Size to a higher setting
TASCAM US-20x20
35
11 – Specifications
88 Line inputs (balanced, LINE IN 9–10)
Ratings
88 Sampling frequencies
44.1, 48, 88.2, 96, 176.4, 192 kHz
88 Quantization bit depth
16/24-bit
Input/output ratings
When LEVEL switch set to +4dBu
Connectors: 6.3mm (1/4") standard TRS jacks (Tip: HOT,
Ring: COLD, Sleeve: GND)
Input impedance: 10 kΩ
Nominal input level: +4 dBu (1.228 Vrms)
Maximum input level: +24 dBu (12.282 Vrms)
Analog outputs
88 Line outputs (balanced, LINE OUT 1–10)
Analog inputs
88 Mic inputs (balanced, IN1–IN8)
Connector: XLR-3-31 equivalent (1: GND, 2: HOT, 3: COLD)
Input impedance: 2.4 kΩ
Nominal input level (gain knob at MAX): −68 dBu (0.0003
Vrms)
Nominal input level (gain knob at MIN): −12 dBu (0.195 Vrms)
Maximum input level: +8 dBu (1.947 Vrms)
Gain range: 56 dB
88 Instrument inputs (unbalanced, IN1–IN2)
Connectors: 6.3mm (1/4") standard TS jacks (Tip: HOT,
Sleeve: GND)
Input impedance: 1 MΩ or more
Nominal input level (gain knob at MAX): −68 dBV (0.0004
Vrms)
Nominal input level (gain knob at MIN): −12 dBV (0.251 Vrms)
Maximum input level: +8 dBV (2.512 Vrms)
Gain range: 56 dB
88 Line inputs (balanced, IN3–IN8)
Connectors: 6.3mm (1/4") standard TRS jacks (Tip: HOT, Ring:
COLD, Sleeve: GND)
Input impedance: 10 kΩ
Nominal input level (gain knob at MAX): −52 dBu (0.0019
Vrms)
Nominal input level (gain knob at MIN): +4 dBu (1.228 Vrms)
Maximum input level: +24 dBu (12.282 Vrms)
Gain range: 56 dB
88 Line inputs (unbalanced, LINE IN 9–10)
When LEVEL switch set to −10dBV
Connectors: 6.3mm (1/4") standard TS jacks (Tip: HOT,
Sleeve: GND)
Input impedance: 10 kΩ
Nominal input level: −10 dBV (0.3162 Vrms)
Maximum input level: +10 dBV (3.162 Vrms)
36 TASCAM
US-20x20
Connectors: 6.3mm (1/4") standard TRS jacks
(Tip: HOT, Ring: COLD, Sleeve: GND)
Output impedance: 100 Ω
Nominal output level: +4 dBu (1.228 Vrms)
Maximum output level: +24 dBu (12.277 Vrms)
88 Headphone outputs (PHONES 1/2)
Connectors: 6.3mm (1/4") standard stereo jacks
Maximum output: 70mW + 70mW (THD+N 0.1% or less, into
32 Ω load)
Frequency response (input w PHONES 1/2 output)
At 44.1 kHz and 48 kHz
20 Hz – 20 kHz: ±1.0 dB (JEITA)
At 176.4 kHz and 192 kHz
20 Hz – 80 kHz: ±5.0 dB (JEITA)
Digital audio input/output ratings
88 COAXIAL IN
Connectors: RCA pin jacks
Signal format: IEC60958-3 (S/PDIF)
Input impedance: 75 Ω
Input level: 0.5 Vp−p/75 Ω
88 COAXIAL OUT
Connectors: RCA pin jacks
Signal formats: IEC 60958-3 (S/PDIF)/IEC 60958-4 (AES/EBU)
• Changeable on the Settings Panel INTERFACE page
Output impedance: 75 Ω
Output level: 0.5 Vp−p/75 Ω
88 OPTICAL (S/MUX) IN/OUT
Connectors: OPTICAL (JEITA RC-5720C)
Signal format: Multi-channel optical (supports S/MUX when
88.2/96/176.4/192kHz)
11 – Specifications
Control input/output ratings
88 USB
Connector: USB 3.0 B type
Transfer rate: USB 3.0 Super Speed (5 Gbps)
88 MIDI IN connector
Connector: 5-pin DIN
Format: standard MIDI
88 MIDI OUT connector
Connector: 5-pin DIN
Format: standard MIDI
88 WORD IN connector
Connector: BNC
Input voltage: 2.0 Vp-p – 5.0 Vp-p
Input impedance: 75 Ω ±10%
Permitted frequency deviation during external synchronization: ±100 ppm
Terminal on/off switch
88 WORD OUT connector
Connector: BNC
Input voltage: 2.0 Vp-p (into 75 Ω)
Output impedance: 75 Ω ±10%
Sampling frequencies: 44.1, 48, 88.2, 96, 176.4 and 192 kHz
OUT/THRU switch
Audio performance
88 Mic amp EIN (equivalent input noise)
−125 dBu or lower
88 Frequency response
Input w LINE OUT (BALANCED)
At 44.1/48 kHz and 20 Hz – 20 kHz: ±0.5 dB (JEITA)
At 176.4/192 kHz and 20 Hz – 80 kHz: ±5 dB (JEITA)
88 S/N ratio
104 dB or higher (MIC/LINE IN w LINE OUT, gain knob at
MIN, JEITA)
88 Distortion
0.005% or less (MIC/LINE IN w LINE OUT, 1kHz sine wave, at
nominal input level and maximum output level)
88 Crosstalk
100 dB or more (MIC/LINE IN w LINE OUT, 1 kHz)
Computer system requirements
Check the TEAC Global Site (http://teac-global.com/) for the
latest information about supported operating systems.
Windows
88 Supported operating systems
Windows 10 (32-bit)
Windows 10 (64-bit)
Windows 8 (including 8.1) 32-bit
Windows 8 (including 8.1) 64-bit
Windows 7 32-bit SP1 or later
Windows 7 64-bit SP1 or later
88 Computer hardware requirements
Windows computer with a USB 3.0 or USB 2.0 port
88 CPU/processor speed
2 GHz or faster dual core processor (x86)
88 Memory
2 GB or more
88 Display resolution
1280×800 or greater
CAUTION
• The included USB cable (USB 2.0 or USB 3.0) and the USB
specification that can be used depends on the the computer
and OS you are using. Connect with the included USB 3.0
cable to use the USB 3.0 standard.
Supported operating
systems
Windows 10 32-bit
Windows 10 64-bit
Windows 8 (including
8.1) 32-bit
Windows 8 (including
8.1) 64-bit
Windows 7 32-bit SP1
or later
Windows 7 64-bit SP1
or later
USB standard
USB 2.0 USB 3.0
ü
ü
ü
ü
ü
-
ü
-
ü
-
ü
-
USB cable
connected
USB 3.0 cable
USB 2.0 cable
USB 2.0 cable
USB 2.0 cable
• Operation of this unit was confirmed using standard
computers that meet the above requirements. This does
not guarantee operation with all computers that meet the
above requirements. Even computers that meet the same
system requirements might have processing capabilities
that differ according to their settings and other operating
conditions
TASCAM US-20x20
37
11 – Specifications
General
Mac OS X
88 Supported operating systems
88 Power
OS X Yosemite (10.10.1 or later)
OS X Mavericks (10.9.5)
OS X Mountain Lion (10.8.5)
DC12V AC adapter (GPE248-120200-Z)
88 Power consumption
20W
88 Computer hardware requirements
88 Dimensions
Mac with a USB 3.0 or USB 2.0 port
With standard frame attached
445 × 59 × 222 mm (W × H × D)
With rack mount adapters attached
482.6 × 44 × 222.4 mm (W × H × D)
88 CPU/processor speed
2 GHz or faster dual core processor
88 Memory
2 GB or more
88 Weight
88 Display resolution
2.7kg
1280×800 or greater
88 Operating temperature range
CAUTION
The included USB cable (USB 2.0 or USB 3.0) and the USB
specification that can be used depends on the the computer
and OS you are using.
USB standard
Supported operating
systems
USB 2.0 USB 3.0
OS X Yosemite (10.10.1
ü
or later)
OS X Mavericks
ü
(10.9.5)
OS X Mountain Lion
ü
(10.8.5)
USB cable
connected
USB 2.0 cable
USB 2.0 cable
USB 2.0 cable
iOS devices
Device made by Apple Inc. running iOS 7 or later
Supported audio drivers
88 Windows
USB Audio Class 2.0, ASIO 2.0, WDM (MME), MIDI
88 Mac
Core Audio, Core MIDI
38 TASCAM
US-20x20
5–35 °C (32–104 °F)
11 – Specifications
Dimensional drawings
445mm
11.2mm
201mm
9.8mm
88 With standard frame attached (as shipped from the factory)
59mm
432.6mm
482.6mm
12.4mm
197.8mm
12.2mm
88 With rack mount adapters attached
44mm
31.8mm
465mm
• Illustrations in this reference manual might differ in part from the actual product.
• The external appearance might be changed without notification to improve the product.
TASCAM US-20x20
39
40 TASCAM
US-20x20
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11 – Specifications
Block diagrams
Mic preamp mode
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TASCAM US-20x20
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11 – Specifications
Audio interface mode
41
42 TASCAM
US-20x20
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11 – Specifications
Digital mixer mode
11 – Specifications
Level diagrams
TASCAM US-20x20
43
TEAC CORPORATIONhttp://tascam.jp/
Phone: +81-42-356-9143
1-47 Ochiai, Tama-shi, Tokyo 206-8530 Japan
TEAC AMERICA, INC.http://tascam.com/
Phone: +1-323-726-0303
1834 Gage Road, Montebello, California 90640 USA
TEAC MEXICO, S.A. de C.V.http://teacmexico.net/
Phone: +52-55-5010-6000
Río Churubusco 364, Colonia Del Carmen, Delegación Coyoacán, CP 04100, México DF, México
TEAC UK Ltd.http://tascam.eu/
Phone: +44-8451-302511
2 Huxley Road, Surrey Research Park, Guildford, GU2 7RE, United Kingdom
TEAC EUROPE GmbHhttp://tascam.eu/
Phone: +49-611-71580
Bahnstrasse 12, 65205 Wiesbaden-Erbenheim, Germany
TEAC SALES & TRADING(SHENZHEN) CO., LTDhttp://tascam.cn/
Phone: +86-755-88311561~2
Room 817, Block A, Hailrun Complex, 6021 Shennan Blvd., Futian District, Shenzhen 518040, China
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