Focusrite Scarlett 18i20 2nd Gen, Scarlett 18i20, AMS-SCARLETT-18I20-2ND-GE User manual

Focusrite Scarlett 18i20 2nd Gen, Scarlett 18i20, AMS-SCARLETT-18I20-2ND-GE User manual
User Guide
FFFA001448-01
www.focusrite.com
TABLE OF CONTENTS
OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Box Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mac OS X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
GETTING STARTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
HARDWARE FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting your Scarlett 18i20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mac OS X only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Windows only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Audio Setup in your DAW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Example of Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Recording a band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Low Latency Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connecting Scarlett 18i20 to loudspeakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Using the ADAT connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Using the Scarlett 18i20 as a stand-alone mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FOCUSRITE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Physical and Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
COPYRIGHT AND LEGAL NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2
OVERVIEW
Introduction
Thank you for purchasing this Second Generation Scarlett 18i20, one of the family of Focusrite
professional audio interfaces incorporating high quality Focusrite analogue pre-amplifiers. In
conjunction with the unit’s accompanying software application, Focusrite Control, you now have a
compact yet highly versatile solution for routing high quality audio to and from your computer. You
can also use the Scarlett 18i20 as a “stand-alone” interface to any other type of recording device,
once you have configured it using Focusrite Control.
Focusrite Control, and several other exciting and useful software applications, can be downloaded
free of charge once you have registered your product. Note that a separate Focusrite Control User
Guide is also available; we strongly recommend that you download this as well.
In developing the Second Generation series of Scarlett interfaces, we have enhanced both the
performance and feature set including support for sample rates up to 192 kHz, improved mic preamp
performance with low noise and plenty of gain, and upgraded instrument inputs with additional
headroom for recording the loudest guitar parts without clipping.
Your Second Generation Scarlett interface is compatible with the new Focusrite Control software
application: this lets you control various hardware features, set up monitor mixes and configure
routings. There is a Focusrite Control installer for both Mac and Windows platforms, and no driver
is required for Macs. The Windows version of the installer contains the driver, so in either case, you
only need to install Focusrite Control to get up and running.
This User Guide provides a detailed explanation of the hardware to help you achieve a thorough
understanding of the product’s operational features. We recommend that you take the time to read
through the user guide, whether you’re new to computer-based recording or a more experienced
user, so that you are fully aware of all the possibilities that the Scarlett 18i20 and accompanying
software have to offer. If the main User Guide sections do not provide the information you need,
be sure to consult https://support.focusrite.com/, which contains a comprehensive collection of
answers to common technical support queries.
Features
The Scarlett 18i20 audio interface provides the means for connecting microphones, musical
instruments, line level audio signals and digital audio signals in both ADAT and S/PDIF formats to a
computer running compatible versions of Mac OS or Windows via one of the computer’s USB ports.
The signals at the physical inputs can be routed to your audio recording software / digital audio
workstation (referred to throughout this user guide as the “DAW”) at up to 24-bit, 192 kHz resolution;
similarly, the DAW’s monitor or recorded output signals can be configured to appear at the unit’s
physical outputs.
The outputs can be connected to amplifiers and speakers, powered monitors, headphones, an audio
mixer or any other analogue or digital audio equipment that you wish to use. Although all inputs and
outputs on the Scarlett 18i20 are routed directly to and from your DAW for recording and playback,
you can configure the routing within your DAW in order to meet your precise needs.
The accompanying software application, Focusrite Control, provides further routing and monitoring
options, as well as the ability to control global hardware settings such as sample rate and
synchronisation.
3
All inputs on the Scarlett 18i20 are routed directly to your DAW software for recording, but Focusrite
Control also allows you to route these signals internally within the device to the outputs so that you
can monitor the audio signals with ultra-low latency - before they arrive at your DAW, should you
need to do so.
The Scarlett 18i20 also has connectors for sending and receiving MIDI data, and for transmitting
word clock to ensure synchronisation with other items of digital audio equipment.
Box Contents
Along with your Scarlett 18i20 you should find:
• Bundle code* for accessing the following on-line resources:
- Focusrite Control (also available from www.focusrite.com/downloads)
- Focusrite Red 2 & 3 Plug-in Suite
- Softube Time and Tone bundle
- ProTools | First
- Ableton Live Lite
- LoopMasters sample library
- Novation Bass station
- Multi-language User Guides for both Scarlett 18i20 and Focusrite Control
• USB cable
• Getting Started Guide and Important Safety Information*
* information printed on the inside of the gift box
System requirements
Mac OS X
Apple Macintosh with a USB 2.0 or 3.0-compliant USB port and an Internet connection*
OS: Mac OS X 10.10 (Yosemite) or OS X 10.11 (El Capitan)**
Windows
Windows compatible computer with a USB 2.0 or 3.0-compliant USB port and an Internet connection*
OS: Windows 7 (32- or 64-bit), 8.1 and 10**
* Internet connection required for downloading on-line resources.
** System requirements are subject to change. Please check the following link for compatibility details: .
www.focusrite.com/downloads/os
4
GETTING STARTED
IMPORTANT: PLEASE ENSURE THAT YOU INSTALL FOCUSRITE CONTROL BEFORE
CONNECTING THE INTERFACE TO YOUR COMPUTER.
NOTE THAT THE SECOND GENERATION SCARLETT 18i20 DOES NOT REQUIRE
SEPARATE USB DRIVERS TO BE INSTALLED FOR EITHER MAC OR WINDOWS.
FOCUSRITE CONTROL INCLUDES THE NECESSARY DRIVERS.
Software Installation
All software required by the Scarlett 18i20 - and several powerful and useful extras - are available
for download from the Focusrite website (www.focusrite.com/register). You will find a “Bundle Code”
printed on the inside of the box your Scarlett 18i20 comes in, and the Serial number can be found on
the underside of the unit. You will need to enter these when you access the downloads area of the
website; this procedure ensures that you will have the most up-to-date software versions.
DOWNLOADING THE INCLUDED SOFTWARE
To download the included software, you will need to register your Scarlett 18i20 at
www.focusrite.com/register
You will need the product serial number which can be found on the bottom of your 18i20 hardware.
Once you have entered the serial number, you will be asked to enter your BUNDLE CODE, found below:
PRODUCT BUNDLE CODE
XXXXXX-XXXXXX-XXXXXX
For an in depth video tutorial, please go to www.focusrite.com/get-started
Pour obtenir des instructions en Français sur la façon de commencer, veuillez-vous rendre sur focusrite.com/downloads
Für eine Kurzanleitung zum schnellen Start in deutscher Sprache besuche bitte focusrite.com/downloads
Para la guía de inicio en Español, diríjase a focusrite.com/downloads
所有使用说明中文版,请上网站: focusrite.com/downloads
日本語での説明書はこちら: focusrite.com/downloads
시작 방법에 관한 한국어 가이드는 focusrite.com/downloads 에서 찾으실 수 있습니다
1. Using your usual browser, go to www.focusrite.com/register/.
2. Follow the on-screen instructions, entering the Serial number and then the Bundle Code .
(XXXXXX-XXXXXX-XXXXXX) into the form where prompted. Your Bundle Code is printed on the inside
of the gift box.
3. You will then be able to access the “My Products” page, where Focusrite Control and the other
software products to which your registration entitles you are available for download, complete with
activation codes where applicable.
4. Download and install the Focusrite Control version (Mac or Windows) appropriate for your
computer. Follow all on-screen instructions.
5. When the installation is complete, restart your computer.
6. After restart, connect the Scarlett 18i20 to your computer with the USB cable supplied.
This information is accurate as of May 2016, however we are constantly striving to improve the customer experience and as a result
this process is subject to change. If anything appears to have changed please refer to www.focusrite.com/get-started for the latest
info.
5
HARDWARE FEATURES
Front Panel
1
14
2
3
4 5
6
4 5
7
8
10
9
12
11
13
14
The front panel includes all the input gain and monitoring controls as well as two of the input
connectors for Mic, Line and Instrument signals.
6
1.
Inputs 1 and 2 – Combo type input sockets - connect microphones, instruments (e.g., guitar),
or line level signals via XLR or ¼” (6.35 mm) jacks as appropriate. Either ¼” TRS (balanced)
or TS (unbalanced) jack plugs can be used for instruments or line level signals.
2.
MIC 48V – two switches enabling 48 V phantom power at the XLR contacts of the Combo
connectors for mic inputs 1-4 and 5-8 respectively. (Note that inputs 3 to 8 are on the rear
panel.) The switches each have an associated red LED indicating that phantom power is
selected.
3.
Gain 1 & 2 – adjust the input gain for the signals at Inputs 1 and 2 respectively.
4.
INST – two switches changing the input configuration for the jack contacts at Inputs 1 and
2. When INST is selected, the gain range and input impedance are altered (relative to LINE),
and the input is made unbalanced. This optimises it for the direct connection of instruments
(usually via a 2-pole (TS) jack plug). When INST is off, the inputs are suitable for the connection
of line level signals. Line level signals may be connected either in balanced form via a 3-pole
(TRS) jack or unbalanced via a 2-pole (TS) jack. The switches each have an associated red LED
indicating that INST is selected.
5.
PAD – two switches which insert a 10 dB pad in the signal paths of Inputs 1 and 2. With the pad
applied, the maximum input signal level is +16 dBu. The switches each have an associated red
LED indicating that PAD is selected.
6.
Gain 3 to 8 – adjust the input gain for the signals at Inputs 3 to 8 respectively. (Note that the
connectors for these inputs are on the rear panel.)
7.
Input meters – eight 5-segment LED bargraph meters indicating the signal levels of the eight
analogue input signals. The meters show signal level after the input gain stage, and thus
their indication is affected by the gain controls. The LEDs illuminate at -42 (green, “signal
present”), -18 (green), -6 (green), -3 (yellow) and 0 dBFS (red). A level of 0 dBFS implies digital
clipping, and should always be avoided.
8.
USB active LED – a green LED which illuminates when the unit is recognised by the computer
to which it is connected.
9.
Locked – a green LED which confirms clock synchronisation, either to the Scarlett 18i20’s
internal clock or to an external digital input.
10. MONITOR – main monitor output level control: this will normally control the level at the main
monitor outputs on the rear panel, but can be configured in Focusrite Control to adjust the
level at any of the unit’s ten analogue outputs.
11. DIM and MUTE – two switches controlling the 18i20’s monitor outputs; DIM reduces the
output levels by 18 dB, while MUTE turns the outputs off. By default, these switches affect
the main monitor outputs 1 and 2, but may be configured in Focusrite Control to act on any
of the analogue outputs. The switches each have an associated LED (DIM: yellow, MUTE: red)
indicating that the function is selected.
12.
Headphone volume 1 and 2 – connect one or two pairs of stereo headphones at the two
¼” (6.25 mm) TRS jack sockets below the controls. The headphone outputs always carry
the signals that are currently routed to analogue outputs 7/8 and 9/10 (as stereo pairs) in
Focusrite Control.
13. POWER – AC power switch and LED.
14. Rack ears for mounting the Scarlett 18i20 in a standard 19” equipment rack.
7
Rear Panel
23
18
22
21
20
17
16
15
19
15. MIC/LINE INPUTS 3 to 8 – Combo type input sockets - connect further microphones or line
level signals via XLR or ¼” (6.35 mm) jacks as appropriate. Either ¼” TRS (balanced) or TS
(unbalanced) jack plugs can be used for line level signals.
16. LINE OUTPUTS 3 and 10 – eight balanced analogue line outputs on ¼” (6.35 mm) jack sockets;
use TRS jacks for a balanced connection or TS jacks for unbalanced. The signals available at
these outputs are defined in Focusrite Control, and can typically be used for driving alternative
speakers (i.e., midfield, nearfield, etc.), the additional speakers in a multichannel monitoring
system, or to drive outboard FX processors.
17. MONITOR 1 and 2 – two balanced analogue line outputs on ¼” (6.35 mm) jack sockets; use
TRS jacks for a balanced connection or TS jacks for unbalanced. We recommend the use of
balanced connections wherever possible, to minimise grounding and hum problems. These
are also Line Outputs 1 and 2 of the system, and will generally be used for driving the main
L and R speakers of your monitoring system. However, the signals at the outputs may be
defined in Focusrite Control.
18. OPTICAL IN and OUT – two TOSLINK connectors, each carrying eight channels of digital audio
in ADAT format at 44.1/48 kHz sample rate or four channels at 88.2/96 kHz. These are simply
additional inputs 11 to 18 and outputs 13 to 20 (at 44.1/48 kHz) to/from the Scarlett 18i20.
Note that the optical input and output are disabled when sample rates of 176.4/192 kHz are
in use.
19. WORD CLOCK OUT – a BNC connector carrying the Scarlett 18i20’s word clock; this may be
used to synchronise other digital audio equipment forming part of the recording system. The
source of sample clock synchronisation used by the Scarlett 18i20 is selected from Focusrite
Control.
20.
USB 2.0 port – Type B connector; connect the Scarlett 18i20 to your computer with the
cable supplied.
21. MIDI IN and MIDI OUT – standard 5-pin DIN sockets for connection of external MIDI equipment.
The Scarlett 18i20 acts as a “Break-out (and Break-in) Box”, allowing MIDI data to/from your
computer to be distributed to additional MIDI devices.
22. SPDIF IN and OUT – two phono (RCA) sockets carrying two-channel digital audio signals into
or out of the Scarlett 18i20 in S/PDIF format. These appear as Inputs 9 & 10 and Outputs 11 &
12 in Focusrite Control (but note the S/PDIF outputs are unavailable at 176.4/192 kHz sample
rates).
23. AC mains – standard IEC receptacle.
8
Connecting your Scarlett 18i20
IMPORTANT: Before you connect your Scarlett 18i20 to your
computer, please complete the software installation according to the
instructions at page 5. This will ensure that the hardware uses the
correct drivers, and will prevent unexpected behaviour.
Power
The Scarlett 18i20 should be connected to AC mains with the supplied AC power cable. Plug the IEC
connector into the rear panel IEC receptacle. We recommend that the unit is not turned on until the
USB connection has been made (see below).
USB
The Scarlett 18i20 has a single USB 2.0 port (on the rear panel). Once the software installation is
complete, simply connect the Scarlett 18i20 to your computer; we recommend you use the USB cable
provided. (Note that Scarlett 18i20 is a USB 2.0 device, and thus the USB connection requires a USB
2.0-compliant port on your computer. It will not operate correctly with USB 1.0/1.1 ports, however
typically a USB 3.0 port will support a USB 2.0 device.)
When the USB cable has been connected, turn the Scarlett 18i20 on with the front panel power
switch.
Mac OS X only:
Your OS should automatically switch the computer’s default audio inputs & outputs to the .
Scarlett 18i20. To verify this, go to System Preferences > Sound, and ensure that the input and
output are set to Scarlett 18i20. For more detailed setup options on a Mac, open Applications
> Utilities > Audio MIDI Setup.
Windows only:
Your OS should automatically switch the computer’s default audio inputs and outputs to be the
Scarlett 18i20. To verify this go to: Start > Control Panel > Hardware and Sound > Sound
> Manage Audio Devices and ensure that ‘Default Playback’ and ‘Recording’ are set to .
‘Scarlett 18i20’
9
Audio Setup in your DAW
The Scarlett 18i20 is compatible with any Windows-based DAW that supports ASIO or WDM or
any Mac-based DAW that uses Core Audio. After installing Focusrite Control and connecting
the hardware, you can start using your Scarlett 18i20 with the DAW of your choice. To allow you
to get started if you do not already have a DAW application installed on your computer, both .
Pro Tools | First and Ableton Live Lite are included; these will be available to you once you’ve
downloaded and activated your software online. To install either DAW, download and save the relevant
installer file from your registered Focusrite “My Products” page as described on page 5, and then
run it, following all on-screen instructions.
Operating instructions for Ableton Live Lite and Pro Tools | First are beyond the scope of this User
Guide, but both applications include a full set of Help files. You can also find a video tutorial on
getting started with Ableton Live Lite at www.focusrite.com/getting-started.
Please note - your DAW may not automatically select the Scarlett 18i20 as its default I/O device.
In this case, you must manually select the driver on your DAW’s Audio Setup* page (select .
Scarlett 18i20 for Mac or Focusrite USB 2.0 driver for Windows). Please refer to your DAW’s
documentation (or Help files) if you are unsure where to select the ASIO/Core Audio driver. The
example below shows the correct configuration in the Ableton Live Lite Preferences panel .
(Mac version shown).
*Typical name. Terminology may differ slightly between DAWs.
10
Once the Scarlett 18i20 is set as the preferred Audio Device* in your DAW, all 18 inputs and 20 outputs
will appear in your DAW’s Audio I/O preferences (note however that Ableton Live Lite is limited to a
maximum of four simultaneous mono input channels and four simultaneous mono output channels).
Depending on your DAW, you may need to enable certain inputs or outputs before use. The two
examples below show four inputs and four outputs enabled in Ableton Live Lite Audio Preferences.
*Typical name. Terminology may differ slightly between DAWs.
11
Example of Usage
The Scarlett 18i20 is an excellent choice for several different recording and monitoring applications.
Some typical configurations are shown below.
Recording a band
Microphone
Guitar
Engineer’s Headphones
(Front Panel)
(Rear Panel)
Stereo Keys
Musicians’ Individual
foldback mixes
This setup illustrates a typical configuration for recording a group of musicians with DAW software
on Mac or PC.
A selection of sources – microphones, a guitar and DI boxes – are shown connected to the Scarlett
18i20’s inputs. Note that only Inputs 1 and 2 can be configured to accept instruments directly, so we
have chosen to plug the guitar into Input 2. Ensure the INST button is pressed and the INST LED is
illuminated.
The connection to the PC or Mac running DAW software is via the USB cable supplied. This will carry
all the input and output signals between the DAW and the Scarlett 18i20. Once the audio setup is
correctly configured in the DAW, each input source will be automatically routed to its own DAW track
for recording.
12
Low Latency Monitoring
You will frequently hear the term “latency” used in connection with digital audio systems. In the
case of the simple DAW recording application described above, latency will be the time it takes for
your input signals to pass through your computer and audio software, and back out again via your
audio interface. While not an issue for most simple recording situations, under some circumstances,
latency can be a problem for a performer who wishes to record while monitoring their input signals.
This might be the case if you need to increase the size of your DAW’s recording buffer, which could
be necessary when you record overdubs on a particularly large project using many DAW tracks,
software instruments and FX plug-ins.
The Scarlett 18i20, in conjunction with Focusrite Control, allows “low latency monitoring”, which
overcomes this problem. You can route your input signals directly to the Scarlett 18i20’s headphone
outputs. This enables the musicians to hear themselves with ultra-low latency – i.e., effectively in
“real time” – along with the computer playback. The input signals to the computer are not affected
in any way by this setting. However, note that any effects being added to the live instruments by
software plug-ins will not be heard in the headphones in this case, although the FX will still be
present on the recording.
In the example, each of the band members is receiving his/her own monitor mix, because they each
have their “own” Scarlett 18i20 output. Focusrite Control lets you define up to eight separate mixes,
and these mixes may include previously recorded DAW tracks as well the current input signals.
Guitar
Bass
Headphones (Keyboards)
Headphones (Drums)
Headphone
Amplifier
Headphone
Amplifier
Direct Monitoring
set up in
Focusrite Control
Keyboards
Kick
Snare
Headphones
(Guitar)
Headphones
(Bass)
Headphones (Vocals)
Headphone
Amplifier
Overheads
Vocals
When using Direct Monitoring, ensure that your DAW software is not set to route any inputs (what you
are currently recording) to any outputs. If it is, the musicians will hear themselves “twice”, with one
signal audibly delayed as an echo.
13
Connecting Scarlett 18i20 to loudspeakers
The 1/4” jack MONITOR outputs on the rear panel (Line Outputs 1 and 2) will normally be used to drive
monitoring speakers. Self-powered monitors incorporate internal amplifiers with a volume control,
and may be connected directly. Passive loudspeakers will require a separate stereo amplifier; in this
case, the rear panel outputs should be connected to the amplifier’s inputs.
Active Speakers
Passive Speakers
All the line output connectors are 3-pole (TRS) ¼” (6.35 mm) jack sockets, and are electronically
balanced. Typical consumer (hi-fi) amplifiers and small powered monitors will probably have
unbalanced inputs, either on phono (RCA) sockets, or via a 3.5 mm 3-pole jack plug intended for
direct connection to a computer. In either case, use a suitable connecting cable with jack plugs at
one end.
14
Professional active monitors and professional power amplifiers will generally have balanced inputs.
When mixing, you can connect several pairs of additional speakers (mid-field, near-field, etc.) to
pairs of outputs and use Focusrite Control to route your mix to the different outputs as desired, to
check your mix on the different types of speaker.
NOTE: You run the risk of creating an audio feedback loop if loudspeakers are active at the same time
as a microphone! We recommend that you always turn off (or turn down) monitoring loudspeakers
while recording, and use headphones when overdubbing.
Working with surround sound
Because the Scarlett 18i20 is equipped with ten line outputs, it is ideally suited for use when working
in multichannel sound formats – LCRS, 5.1 surround or 7.1 surround, for example. Using Focusrite
Control, simply route each DAW monitor output to the desired speaker.
The example below shows how you would connect the six loudspeakers in a 5.1 surround monitoring
arrangement.
Left (L)
Right (R)
Centre (C)
(Sub Bass) LFE
Rear Left (RL)
1
4
3
2
8
7
Note - Amplifiers not shown
Rear Right (RR)
The table below summarises how some common multichannel formats could be mapped to the
Scarlett 18i20’s outputs for monitoring purposes, as configured within the DAW:
FORMAT
OUT 1
OUT 2
OUT 3
OUT 4
Quad
L
R
2.1
L
R
5.1
L
R
C
LFE
7.1
L
R
C
LFE
OUT 5
OUT 6
OUT 7
OUT 8
RL
RR
RL
RR
RL
RR
LFE
SL
SR
RL/RR = Rear Left/Rear Right; SL/SR = Side Left/Side Right; LFE = sub-bass channel
15
Using the ADAT connection
In addition to the eight analogue inputs, the Scarlett 18i20 has an OPTICAL IN ADAT input port which
can provide an additional eight audio inputs at 44.1/48 kHz sample rate or four at 88.2/96 kHz. Note
that the optical input is disabled when sample rates of 176.4/192 kHz are in use.
Using a separate 8-channel microphone preamplifier equipped with an ADAT output – such as the
Focusrite OctoPre MkII – provides a simple and excellent method of expanding the Scarlett 18i20’s
input capability.
OctoPre MkII
8ch Mic Amp
Wordclock link
Computer
running DAW
and
Focusrite
Control
Optical ADAT connection (TOSLINK)
Up to 16 Mic/Line Sources
Inputs 1 & 2 on front panel
Inputs 1 & 2 on front panel
The OctoPre MkII’s ADAT output is connected to the Scarlett 18i20’s OPTICAL IN port with a single
TOSLINK optical cable. To synchronise the two devices over ADAT, set the clock source of the OctoPre
MkII to Internal and that of the Scarlett 18i20 (via Focusrite Control) to ADAT. Alternatively, stable
word clock synchronisation may be achieved by connecting the Scarlett 18i20’s WORD CLOCK OUT
to the OctoPre MKII’s WORD CLOCK IN and setting the OctoPre MkII to use Word Clock as its clock
source, Focusrite Control clock source should be set to Internal.
TIP: When interconnecting two digital devices by any method, always ensure that both are set
to the same sample rate.
The additional inputs realised by use of the ADAT port may be routed using Focusrite Control in
exactly the same manner as the other inputs. The additional inputs can form part of any musician’s
headphone mix, as required.
If a suitable ADAT “break-out” box is available, the OPTICAL OUT ADAT port may be used in the
opposite manner; for example, additional outputs from the DAW may be converted into the analogue
domain to allow the use of an external hardware mixing console to mix down a large number of DAW
tracks.
16
Using the Scarlett 18i20 as a stand-alone mixer
The Scarlett 18i20 has the ability to store a mix configuration defined in Focusrite Control within
the hardware. This feature lets you configure it – for example, as an on-stage keyboard mixer –
using your computer, and then upload the configuration to the device itself. Then you can use the .
Scarlett 18i20 as a simple local mixer as part of your keyboard rig to control the overall mix of
multiple keyboards.
To FOH Mixer
In the example illustrated, three stereo keyboards are connected to the rear panel inputs of the
Scarlett 18i20; Outputs 3 and 4 go to the main PA system. The performer can adjust the volume of
the individual keyboards from the front panel; he/she can also adjust the overall level of the keyboard
mix.
17
FOCUSRITE CONTROL
Focusrite Control software allows flexible mixing and routing of all audio signals to the physical
audio outputs, as well as control of output monitor levels. Sample rate selection and digital sync
options are also available from Focusrite Control.
NOTE: Focusrite Control is a generic product, and may be used with
other Focusrite hardware interfaces. When you connect an interface to
your computer and launch Focusrite Control, the model of interface is
automatically detected, and the software configured to suit the number of
inputs and outputs, and other facilities, available on the hardware.
IMPORTANT: A separate Focusrite Control User Guide can be downloaded .
once you have completed the on-line registration process. This describes the
use of Focusrite Control in full detail, together with examples of application.
To open Focusrite Control:
Installing Focusrite Control on your computer will place an FC icon on the dock or desktop.
Click the icon to launch Focusrite Control.
Assuming that your Scarlett interface is connected to your computer with the USB cable, the Focusrite
Control GUI (Graphical User Interface) will appear as shown below (Mac version illustrated).
18
The following table provides the channel routings when preset option “Direct Routing” is selected
in Focusrite Control; see the screen image on page 18. Note that as the channel count available
via the ADAT optical ports is reduced at higher sample rates, the default routings change slightly at
the higher rates.
At 44.1 kHz and 48 kHz sample rates:
CH NO.
INPUTS
OUTPUTS
1
Input 1
Output 1
2
Input 2
Output 2
3
Input 3
Output 3
4
Input 4
Output 4
5
Input 5
Output 5
6
Input 6
Output 6
7
Input 7
Output 7
8
Input 8
Output 8
9
S/PDIF 1
Output 9
10
S/PDIF 1
Output 10
11
ADAT 1
S/PDIF 1
12
ADAT 2
S/PDIF 2
13
ADAT 3
ADAT 1
14
ADAT 4
ADAT 2
15
ADAT 5
ADAT 3
16
ADAT 6
ADAT 4
17
ADAT 7
ADAT 5
18
ADAT 8
ADAT 6
19
ADAT 7
20
ADAT 8
19
At 88.2 kHz and 96 kHz sample rates:
At 176.4 kHz and 192 kHz sample rates:
CH NO.
INPUTS
OUTPUTS
CH NO.
INPUTS
OUTPUTS
1
Input 1
Output 1
1
Input 1
Output 1
2
Input 2
Output 2
2
Input 2
Output 2
3
Input 3
Output 3
3
Input 3
Output 3
4
Input 4
Output 4
4
Input 4
Output 4
5
Input 5
Output 5
5
Input 5
Output 5
6
Input 6
Output 6
6
Input 6
Output 6
7
Input 7
Output 7
7
Input 7
Output 7
8
Input 8
Output 8
8
Input 8
Output 8
9
S/PDIF 1
Output 9
9
S/PDIF 1
Output 9
10
S/PDIF 1
Output 10
10
S/PDIF 1
Output 10
11
ADAT 1
S/PDIF 1
11
12
ADAT 2
S/PDIF 2
12
13
ADAT 3
ADAT 1
13
14
ADAT 4
ADAT 2
14
15
ADAT 3
15
16
ADAT 4
16
17
17
18
18
19
19
20
20
Please refer to the Focusrite Control User Guide for further details.
20
SPECIFICATIONS
Performance Specifications
Configuration
Inputs
18: analogue (8), ADAT (8), S/PDIF (2)
Outputs
20: analogue (10), ADAT (8), S/PDIF (2)
Mixer
Fully assignable 18-in/10-out software mixer .
(Focusrite Control)
Digital Performance
Supported sample rates
44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz and 192 kHz
Clock jitter
<250 ps
Microphone Inputs
Frequency Response
20 Hz to 20 kHz, +0.5/-1.5 dB
Dynamic Rnge
109 dB (‘A’-weighted)
THD+N
< 0.002%
Noise EIN
–127 dBu
Maximum Input Level
+8.5 dBu (without pad)
Gain Range
50 dB
Line Inputs 1 & 2
Frequency Response
20 Hz to 20 kHz, +0.5/-1.5 dB
Dynamic Range
109 dB (‘A’-weighted)
THD+N
< 0.003%
Maximum Input Level
+22 dB
Gain Range
50 dB
Line Inputs 3 & 8
Frequency Response
20 Hz to 20 kHz, +/-0.5 dB
Dynamic Range
110 dB (‘A’-weighted)
THD+N
< 0.003%
Maximum Input Level
+16 dB
Gain Range
50 dB
21
Instrument Inputs
Frequency Response
20 Hz to 20 kHz, +0.5/-1.5 dB
Dynamic Range
109 dB (‘A’-weighted)
THD+N
< 0.003%
Maximum Input Level
+12 dBu
Gain Range
50 dB
Line Outputs 1 to 10
Frequency Response
20 Hz to 20 kHz, +/-0.5 dB
Dynamic Range
108 dB (‘A’-weighted)
THD+N
< 0.001%
Maximum Output Level (0 dBFS)
+16 dBu, balanced
Headphone Outputs
Frequency Response
20 Hz to 20 kHz, +/-0.5 dB
Dynamic Range
108 dB (‘A’-weighted)
THD+N
< 0.001%
Maximum Output Level (0 dBFS)
+13 dBu
22
Physical and Electrical Characteristics
Analogue Inputs 1 & 2
Connectors
XLR Combo type: Mic/Line/Inst, on front panel
Mic/Line switching
Automatic
Line/Instrument switching
2 x front panel switches
Phantom power
Shared +48 V phantom power switch for inputs 1 to 4
Analogue Inputs 3 to 8
Connectors
XLR Combo: Mic/Line, on rear panel
Mic/Line switching
Automatic
Phantom power
Shared +48 V phantom power switch for inputs 1 to 4 .
and 5 to 8
Analogue Outputs
Main outputs
10 x balanced ¼” TRS jacks on rear panel
Stereo headphone outputs
2 x ¼” TRS jack on front panel
Main monitor output level control
Headphones level controls
On front panel
Other I/O
ADAT I/O
2 x TOSLINK optical connectors; 8 channels @ 44.1/48 kHz or
4 channels @ 88.2/96 kHz
S/PDIF I/O
2 x phono (RCA)
Word clock output
BNC connector
USB
1 x USB 2.0 Type B connector
MIDI I/O
2 x 5-pin DIN sockets
Weight and Dimensions
WxDxH
Weight
482 mm x 45 mm (1U) x 286 mm
19” x 1.73” (1U) x 11.26”
3.27 kg
7.21 lb
23
TROUBLESHOOTING
For all troubleshooting queries, please visit the Focusrite Answerbase at
https://support.focusrite.com/hc/en-gb/requests/new where you will find articles covering
numerous troubleshooting examples.
COPYRIGHT AND LEGAL NOTICES
Focusrite is a registered trade mark and Scarlett 18i20 is a trade mark of Focusrite Audio
Engineering Limited.
All other trade marks and trade names are the property of their respective owners.
2016 © Focusrite Audio Engineering Limited. All rights reserved.
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