Apollo Twin MkII Hardware Manual
Manual Version 171101
www.uaudio.com
A Letter from Bill Putnam Jr.
Thank you for deciding to make the Apollo Twin MkII High-Resolution Interface part
of your music making experience. We know that any new piece of gear requires an
investment of time and money — and our goal is to make your investment pay off.
The fact that we get to play a part in your creative process is what makes our efforts
meaningful, and we thank you for this.
In many ways, the Apollo family of audio interface products represent the best examples
of what Universal Audio has stood for over its long history; from UA’s original founding in
the 1950s by my father, through our current vision of delivering the best of both analog
and digital audio technologies.
Starting with its high-quality analog I/O, Apollo Twin MkII’s superior sonic performance
serves as its foundation. This is just the beginning however, as Apollo Twin is the only
desktop audio interface that allows you to run UAD plug-ins in real time. Want to monitor
yourself through a Neve® console channel strip while tracking bass through a classic
Fairchild or LA-2A compressor? Or how about tracking vocals through a Studer® tape
machine with some added Lexicon® reverb?* With our growing library of more than 90
UAD plug-ins, the choices are limitless.
At UA, we are dedicated to the idea that this powerful technology should ultimately serve
the creative process — not be a barrier. These are the very ideals my father embodied
as he invented audio equipment to solve problems in the studio. So as you begin to
incorporate Apollo Twin MkII into your creative process, we hope that the excitement and
pride that we’ve built into it comes through. We believe Apollo Twin MkII will earn its way
into your creative workflow by providing stunning fidelity, great ease-of-use, and rocksolid reliability for years to come.
As always, please feel free to reach out to us via our website www.uaudio.com, and via
our social media channels. We look forward to hearing from you, and thank you once
again for choosing Universal Audio.
Sincerely,
Bill Putnam Jr.
*All trademarks are recognized as property of their respective owners. Individual UAD Powered Plug-Ins sold separately.
Apollo Twin MkII Hardware Manual
2
Welcome
Table Of Contents
Tip: Click any section or page number
to jump directly to that page.
A Letter from Bill Putnam Jr................................................................... 2
Introduction.......................................................................................... 4
Welcome to Apollo!............................................................................................. 4
Apollo Twin MkII Features................................................................................... 7
Operational Overview........................................................................................... 9
About Apollo Twin MkII Documentation............................................................... 11
Additional Resources........................................................................................ 12
Quick Start......................................................................................... 13
Hardware Setup................................................................................................ 13
Software Setup................................................................................................. 14
Connect to Input Sources and Monitor System..................................................... 15
Setting Hardware I/O Levels............................................................................... 16
Controls & Connectors.......................................................................... 17
Controls Overview............................................................................................. 17
Top Panel......................................................................................................... 20
Front Panel...................................................................................................... 25
Side Panel....................................................................................................... 25
Rear Panel....................................................................................................... 26
Specifications..................................................................................... 28
Specification Tables.......................................................................................... 28
Hardware Block Diagram................................................................................... 32
Troubleshooting................................................................................... 33
Notices............................................................................................... 34
Important Safety Information............................................................................. 34
Warranty.......................................................................................................... 35
Maintenance.................................................................................................... 35
Repair Service.................................................................................................. 35
Technical Support................................................................................ 37
Universal Audio Knowledge Base........................................................................ 37
YouTube Support Channel.................................................................................. 37
UAD Community Forums................................................................................... 37
Contact UA Support.......................................................................................... 37
Apollo Twin MkII Hardware Manual
3
Table Of Contents
Introduction
Welcome to Apollo!
Superior Desktop Audio Conversion with
Classic Analog Sound
With its class-leading resolution and Realtime
UAD Processing, Apollo Twin MkII sets a new
standard for desktop music production. This 2x6
Thunderbolt interface for Mac and Windows allows
you to record with near-zero latency through the
full range of UAD Powered Plug-Ins — ingeniously
merging classic analog tones with cutting-edge
features.
MONITOR
Now You Can:
• Record with world-class Apollo A/D and D/A
conversion — as heard on hundreds of hit
records
• Cascade up to 4 Apollo interfaces and 6
UAD-2 devices over Thunderbolt, adding
DSP and I/O as your studio grows
• Mix with UAD plug-ins like the included
Teletronix® LA-2A, 1176, and Fairchild®
compressors, Pultec® EQs, and 610-B
Preamp
• Track with near-zero latency through preamp
emulations from Neve®, API®, Manley®
and more using Unison™ technology*
LINE OUT
3
MONITOR
L
4
R
OPTICAL IN
POWER
OFF
MIC/LINE 2
MIC/LINE 1
ON 12VDC
Unison Technology: The Genuine Sound of Neve, API & Manley Preamps
Apollo Twin MkII features two Unison-enabled mic preamps, letting you track through
exacting mic preamp emulations from Neve, API, Manley, and Universal Audio. An Apollo
exclusive, Unison technology nails the tone of these sought-after tube and solid state mic
pres — including their input impedance, gain stage “sweet spots,” and the componentlevel circuit behaviors of the original hardware.
The secret to Unison is its hardware-software integration between Apollo Twin MkII’s mic
preamps and its onboard UAD-2 SOLO, DUO, or QUAD Core DSP Acceleration. Simply
place a Unison preamp plug-in on your mic input, and tap into the classic sounds of the
world’s most recorded mic preamps.
Apollo Twin MkII Hardware Manual
4
Introduction
A Full Suite of Classic Analog P
rocessing Onboard
Right out of the box, Apollo Twin MkII provides a suite of incredible analog emulation
plug-ins including the world’s only authentic Teletronix LA-2A and UA 1176LN
compressors, the legendary Pultec EQs, and the Unison-enabled UA 610-B Tube
Preamp. Developed by UA’s world-renowned team of algorithm engineers, these Realtime
Analog Classic plug-ins set the standard by which all other hardware emulation plug-ins
are judged.
From the tube warmth of the Pultec EQ on guitars, to the gentle limiting of the LA-2A
on vocals, or the pump of a genuine 1176LN compressor on drums, your recordings will
take a giant leap forward in rich, sonically complex analog sound.
Access the World of UAD Powered Plug-Ins
Beyond the included plug-ins, Apollo Twin MkII lets you tap into the full library awardwinning UAD Powered Plug-Ins — including vintage EQs, Compressors, Reverbs, Tape
Machines and more — at near-zero latency, regardless of your audio software’s buffer
size and without taxing your computer’s CPU.
With exclusive emulations from Neve, Studer, Manley, API, Ampex, Lexicon, Fender,
and more,* it’s like having an endless analog studio, right on your desktop. And unlike
competing interfaces, these DSP-powered plug-ins are also available in your DAW for
mixing.
Next-Generation A/D and D/A Conversion
Of course, the heart of any audio interface is the quality of its conversion. With the
highest dynamic range and lowest noise of any desktop interface, Apollo Twin MkII gives
you stellar 24-bit/192 kHz sound and breathtaking clarity. Its premium Unison mic
preamps, input stage, and audio conversion are identical to the famed Apollo series,
translating into rich three-dimensional recordings with exceptional depth and punch.
Apollo: The Choice of New-School Professionals
Apollo is the confirmed choice of hit-making professionals, used to record records
by Kendrick Lamar (To Pimp A Butterfly), Coldplay (A Head Full of Dreams), Dr. Dre
(Compton), Brad Paisley (Wheelhouse), and many more. The Apollo range of interfaces
has earned numerous industry awards from Sound on Sound, Future Music and
Electronic Musician — as well as the prestigious 2016 TEC Award for computer audio
hardware.
Now with Vintage Amps a nd Stompboxes
Apollo Twin MkII also includes Unison technology on its front panel instrument input,
giving you dead-on emulations of guitar and bass amps like the Fender ‘55 Tweed
Deluxe, Marshall Plexi Super Lead 1959, and Ampeg B-15N Bass Amplifier, as well as
iconic stompboxes.
*All trademarks are recognized as property of their respective owners. Individual UAD Powered Plug-Ins sold separately.
Apollo Twin MkII Hardware Manual
5
Introduction
Build a Networked Studio
Apollo Twin MkII offers up to 10 x 6 simultaneous input/output channels. Thanks to
Apollo Expanded software, users of any Thunderbolt-equipped Apollo Twin, Apollo
Twin MkII, Apollo 8, Apollo 8p, and Apollo 16 audio interfaces can combine up to four
Apollos and six total UAD-2 devices — adding I/O and DSP as your studio grows. Apollo
Twin MkII makes the perfect intelligent desktop controller for a full Apollo system.
A Sleek, Low-latency App
Console 2.0 is Apollo Twin MkII’s software control interface. Its intuitive, analog consolestyle design provides realtime tracking and monitoring with UAD Powered Plug-Ins,
Channel Strip presets, Drag & Drop functionality, dynamically resizable windows, and
more.
Apollo Twin MkII Hardware Manual
6
Introduction
Apollo Twin MkII Features
Key Features
• Best in class audio quality with improved 24-bit/192 kHz conversion
• Realtime UAD Processing — track through vintage compressors, EQs, tape machines,
and guitar amp/pedal plug-ins with near-zero latency
• 2 premium mic/line preamps; 2 line outs; front-panel Hi-Z instrument input and
headphone output
• Unison™ technology for stunning models of classic mic preamps and guitar amps
• Built-in talkback microphone for communication and recording
• Monitor remote functions can replace dedicated monitor controllers
• UAD-2 SOLO, DUO, or QUAD DSP processing onboard
• Thunderbolt connection for blazing-fast PCIe speed on modern computers
• Uncompromising analog design, superior components, and premium build quality
throughout
• Digitally controlled analog monitor outputs for full resolution at all listening levels
• Cascade up to four Thunderbolt-equipped Apollos and six total UAD-2 devices — adding
I/O and DSP as needed
All Features
Audio Interface
• Sample rates up to 192 kHz at 24-bit word length (96 kHz max on S/PDIF inputs)
• Up to 10 x 6 simultaneous input/output channels
• Two channels of analog-to-digital conversion via:
• Two balanced mic/line inputs
• One Hi-Z instrument input
• Six channels of digital-to-analog conversion via:
• Digitally-controlled stereo monitor outputs
• Stereo headphone outputs
• Line outputs 3-4
• Up to eight channels of digital inputs via:
• Eight channels ADAT optical with S/MUX for high sample rates, or
• Two channels S/PDIF optical with sample rate conversion
Microphone Preamplifiers
• Two high-resolution, ultra-transparent, digitally-controlled analog mic preamps
• Front panel and software control of all preamp parameters
• Low cut filter, 48V phantom power, 20 dB pad, polarity inversion, and stereo linking
Apollo Twin MkII Hardware Manual
7
Introduction
Monitoring
•
•
•
•
•
Digitally-controlled analog monitor outputs maintains highest fidelity
Independently-addressable stereo headphone outputs
Independently-addressable line outputs 3-4 can be used for additional cue mix
Front panel control of level, mute, dim, mono, alternate speakers, and talkback
Built-in talkback microphone for communication and recording
UAD-2 Inside
•
•
•
•
One (SOLO), two (DUO), or four (QUAD) SHARC DSP processors
Realtime UAD Processing on all analog and digital inputs
Same features and functionality as other UAD-2 devices when used with a DAW
Complete UAD Powered Plug-Ins library is available online
Software
Console application:
•
•
•
•
Enables tracking and/or monitoring with Realtime UAD Processing
Remote control of Apollo Twin MkII features and functionality
Virtual I/O for routing DAW tracks through Console
Two independent stereo Auxiliary busses
Console Recall plug-in:
• Saves Apollo Twin MkII configurations inside DAW sessions for easy recall
• Facilitates control of Apollo Twin MkII monitoring features from within the DAW
• VST, RTAS, AAX 64, and Audio Units plug-in formats
UAD Meter & Control Panel application:
• Configures global UAD settings and monitors system usage
Other
•
•
•
•
Attractive and durable desktop form factor
Locking power supply prevents accidental disconnection
Easy firmware updates
One year warranty includes parts and labor
Package Contents
• Apollo Twin MkII unit
• Power supply with (4) AC connectors
(Changeable AC connectors for USA, Europe, UK, Australia, and China)
• Getting Started URL card
Apollo Twin MkII Hardware Manual
8
Introduction
Operational Overview
Audio Interface
First and foremost, Apollo Twin MkII is a premium 2 x 6 Thunderbolt audio interface with
world-class 24-bit/192 kHz audio conversion. Apollo Twin MkII connects to the outputs and
inputs of other audio gear, and performs analog-to-digital (A/D) and digital-to-analog (D/A) audio
conversions on the gear’s signals. The digital audio signals are routed into and out of the host
computer via the high-speed PCIe protocol, which is carried on a single Thunderbolt cable.
Apollo Twin MkII leverages Universal Audio’s expertise in DSP acceleration, UAD Powered
Plug-Ins, and analog hardware design by integrating the latest cutting edge technologies in
high-performance A/D-D/A conversion, DSP signal reconstruction, and connectivity. Apollo Twin
MkII acts as an audio interface with integrated DSP effects for tracking and monitoring, a fully
integrated UAD-2 DSP accelerator for mixing and mastering, as well as a complete monitoring
controller.
About Realtime UAD Processing
Apollo Twin MkII has the ability to run UAD Powered Plug-Ins in realtime. Apollo Twin MkII’s
groundbreaking DSP + FPGA technology enable UAD plug-ins to run with latencies in the sub2ms range, and multiple plug-ins can be stacked in series without additional latency.
Realtime UAD Processing facilitates the ultimate sonic experience while monitoring and/or
tracking.
Note: Apollo Twin MkII, like other UAD-2 devices, can only load UAD Powered Plug-Ins,
which are specifically designed to run on UAD-2 DSP accelerators. Native (host-based)
plug-ins cannot run on the UAD-2 DSP.
Console Software
The Console software application runs on the host computer and is used to control Apollo Twin
MkII mixing and monitoring with Realtime UAD Processing, access the audio interface I/O
settings, and more. Console’s analog-style workflow is designed to provide quick access to the
most commonly needed features in a familiar, easy-to-use mixer interface.
Realtime UAD Processing is a special function that is available only within Console. All
of Apollo Twin MkII’s analog and digital inputs can perform Realtime UAD Processing
simultaneously, and Console inputs with (or without) Realtime UAD Processing can be routed
into the DAW for recording.
Console controls Apollo Twin MkII’s digital mixer so you can monitor Apollo Twin MkII’s inputs
(with or without Realtime UAD Processing) without using any other audio software such as a
DAW.
Console is integral to unleashing the power of Apollo Twin MkII. For complete details about how
to use Console and Realtime UAD Processing, refer to the Apollo Software Manual.
Apollo Twin MkII Hardware Manual
9
Introduction
UAD Powered Plug-Ins in a DAW
Apollo Twin MkII and UAD plug-ins can also be used within a DAW without the use of
Console. UAD plug-ins loaded within the DAW operate like other (non-UAD) plug-ins,
except the processing occurs on the Apollo Twin MkII DSP instead of the host computer’s
processor. In this scenario, UAD plug-ins are subject to the latencies incurred by I/O
buffering.
For details about using UAD Powered Plug-Ins in a DAW, see the UAD System Manual.
Standalone Use
Although the Console application is required to utilize all Apollo Twin MkII features,
the hardware unit can be used as a digital mixer with limited functionality without a
Thunderbolt connection to a host computer.
All currently active I/O assignments, signal routings, and monitor settings are saved to
internal firmware when Apollo Twin MkII is powered down and persist when power is reapplied. Therefore the last-used settings are always available even when a host computer
is not connected.
Note that UAD plug-in instantiations are not retained on power down, because the plugin files reside on the host computer. However, if UAD plug-ins are active when Apollo
Twin MkII’s connection to the host system is lost (if the Thunderbolt cable is unplugged),
the current UAD plug-in configurations remain active for processing until Apollo Twin
MkII is powered down.
Note: Standalone use is unavailable when cascading multiple Apollo units.
Apollo Twin MkII Hardware Manual
10
Introduction
About Apollo Twin MkII Documentation
Documentation for Apollo Twin MkII and UAD Powered Plug-Ins are separated by areas
of functionality, as described below. The user manuals are placed on the system drive
during software installation, and they can be downloaded at www.uaudio.com.
Apollo Manual Files
Note: All manual files are in PDF format. PDF files require a free PDF reader
application such as Adobe Acrobat Reader or Preview (included with macOS).
Apollo Hardware Manuals
Each Apollo model has a unique hardware manual. The Apollo hardware manuals contain
complete hardware-related details about one specific Apollo model. Included are detailed
descriptions of all hardware features, controls, connectors, and specifications.
Note: Each hardware manual contains the unique Apollo model in the file name.
Apollo Software Manual
The Apollo Software Manual is the companion guide to the Apollo hardware manuals.
It contains detailed information about how to configure and control all Apollo software
features using the Console application, Console Settings window, Console Recall plug-in,
and Talkback. Refer to the Apollo Software Manual to learn how to operate the software
tools and integrate Apollo’s functionality into the DAW environment.
Note: Each Apollo connection type (Thunderbolt, FireWire, USB) has a unique
software manual.
UAD System Manual
The UAD System Manual is the complete operation manual for Apollo’s UAD-2
functionality and applies to the entire UAD-2 product family. It contains detailed
information about installing and configuring UAD devices, the UAD Meter & Control
Panel application, buying optional plug-ins at the UA online store, and more. It includes
everything about UAD except Apollo-specific information and individual UAD plug-in
descriptions.
UAD Plug-Ins Manual
The features and functionality of all individual UAD Powered Plug-Ins is detailed in the
UAD Plug-Ins Manual. Refer to this document to learn about the operation, controls, and
user interface of each UAD plug-in that is developed by Universal Audio.
Direct Developer Plug-In Manuals
UAD Powered Plug-Ins includes plug-in titles created by our Direct Developer partners.
Documentation for these 3rd-party plug-ins are separate files written and provided by the
plug-in developers. The file names for these plug-in manuals are the same as the plug-in
titles.
Apollo Twin MkII Hardware Manual
11
Introduction
Accessing Installed Documentation
Any of these methods can be used to access installed documentation:
• Choose Documentation from the Help menu within the Console application
• Click the Product Manuals button in the Help panel within the UAD Meter &
Control Panel application
• Manuals are also available online at help.uaudio.com
Host DAW Documentation
Each host DAW software application has its own particular methods for configuring and
using audio interfaces and plug-ins. Refer to the host DAW’s documentation for specific
instructions about using audio interface and plug-in features within the DAW.
Additional Resources
For additional resources, or if you need to contact Universal Audio for assistance, see the
Technical Support page.
Apollo Twin MkII Hardware Manual
12
Introduction
Quick Start
Apollo Twin MkII hardware and software installation and setup consists of these steps:
1. Hardware Setup: Connect and power the Apollo Twin MkII hardware
2. Software Setup: Download and install the Apollo Twin MkII software
3. Connect to Input Sources and Monitor System
4. Setting Hardware I/O Levels: Learn how to adjust input and output levels
Hardware Setup
Select a Suitable Location
• Locate Apollo Twin MkII on a flat surface so its feet will maintain airflow beneath the
unit.
• The location should be sturdy enough to securely hold its weight and withstand
the pressure of operating the top panel controls.
• Leave enough room behind the unit for connected cabling.
• Do not block the cooling vents on the bottom or sides of the unit.
Connect to Computer and Power
Caution: Before powering Apollo Twin MkII on or off, lower the volume of the
monitor speakers (if connected) and remove headphones from your ears.
1. Connect one Thunderbolt cable (not included) between Apollo Twin MkII and the
host computer.
2. Connect the included power supply to an AC outlet (Apollo Twin MkII cannot be
bus powered).
3. Connect the locking power supply to the rear panel of Apollo. Align the two tabs
on the power cable's connector to the notches on the input, then rotate the barrel
to prevent accidental disconnection.
Important: After ensuring the locking barrel tabs are aligned with the chassis slots
and the barrel is fully inserted, rotate the barrel to secure the connector.
2. Rotate to Lock
1. Align Tabs
12VDC
4. Apply power to Apollo Twin MkII using the rear panel's power switch. Apollo Twin
MkII is now ready for Software Setup.
Apollo Twin MkII Hardware Manual
13
Quick Start
Software Setup
Note: Items on this page are detailed in the Apollo Software Manual. See About Apollo
Twin Documentation for related information.
System Requirements
All system requirements must be met for Apollo Twin MkII to operate properly. Before
proceeding with installation, see the system requirements in the Apollo Software Manual.
Software Installation
The software must be installed to use the hardware and UAD plug-ins. The UAD Powered PlugIns software installer contains the Apollo Twin MkII software and drivers.
Important: For optimum results, connect and power on Apollo Twin MkII before installing
the software.
To obtain the latest UAD Powered Plug-Ins software installer, visit:
• www.uaudio.com/downloads
Registration and Authorization
Apollo Twin MkII must be registered and authorized to unlock UAD plug-ins that are bundled
with the product. Registration and authorization via a web browser is triggered automatically by
the UAD software the first time the device is recognized.
System Configuration
Complete details about setting up the Apollo Twin MkII system, including how to integrate with
a DAW and related information, are included in the Apollo Software Manual.
Console Application
The included Console application is the software interface for the Apollo Twin MkII hardware.
Console controls Apollo Twin MkII and its digital mixing, monitoring, and Realtime UAD
Processing features. Console is also used to configure Apollo Twin MkII’s I/O settings such as
sample rate, clock source, and reference levels.
For complete details about how to operate Console, refer to the Apollo Software Manual.
Apollo Expanded
When more I/O and/or DSP is needed, up to four Apollo interfaces can be cascaded together via
Thunderbolt in a multiple-unit configuration. For complete details about multi-unit cascading,
refer to the Apollo Thunderbolt Software Manual.
UA Support Videos
Many informational videos are available online to help you get started with Apollo Twin MkII:
• help.uaudio.com
Apollo Twin MkII Hardware Manual
14
Quick Start
Connect to Input Sources and Monitor System
One typical Apollo Twin MkII setup is illustrated below. For complete details about all of Apollo
Twin MkII's connectors and controls, see Controls & Connectors.
Instrument
Headphones
Speaker
System
Microphone
LINE OUT
3
MONITOR
L
4
R
OPTICAL IN
POWER
OFF
MIC/LINE 2
MIC/LINE 1
ON 12VDC
Typical Apollo Twin MkII setup connections
Apollo Twin MkII Hardware Manual
15
Quick Start
Setting Hardware I/O Levels
This section explains how to set input gain levels for the hardware inputs (mic, line, and Hi-Z)
and adjust volume levels for the hardware outputs (monitors and headphones).
Refer to the Top Panel illustration for the control names and numbers mentioned below.
Important: Before proceeding, lower the volume of the monitor speakers and remove
headphones from your ears.
Set Input Gains
1. Select the input channel to be adjusted by pressing the Preamp button (7) until the
Channel Selection Indicator (3) displays the channel (CH1 or CH2).
2. Select the input type (mic or line) by pressing the Input Select button (13-a) until the
Input Type indicator (5) displays the desired input jack* (see note below).
3. Adjust the channel's gain by increasing the Level knob (1) until the input meter for
the channel (4) approaches maximum, but does not reach the red clip LED when the
input signal is present. If the level is too high to avoid clipping (when the red “C” LED
illuminates), enable the pad (13-d).
4. To set the input gain for the other input channel, repeat steps 1 – 3.
Adjust Output Volumes
1. Select the output volume to be adjusted (monitor or headphone) by pressing the Monitor
button (11) until the Monitor Selected (8) or Headphone Selected (10) indicator is lit.
2. Set the volume level by carefully increasing the Level knob (1) until the desired volume
is reached (you may need to adjust the volume of the speaker system).
3. To set the other output volume (monitor or headphone), repeat steps 1 – 2.
Mute (and Unmute) Monitor Outputs
1. Select the Monitor outputs by pressing the Monitor button (11) until the Monitor
Selected (8) indicator is lit.
2. Press the MUTE button (13-l) to mute the monitor outputs. The Monitor Selected
Indicator (8) is red when the monitors are muted. When in MONITOR Mode, the Volume
Level Indicator LEDs (2) are also red.
3. To toggle the monitor mute state, press the MUTE button (13-l) whenever Monitor (8) is
selected.
Notes:
• *The Hi-Z input is automatically selected, overriding the channel 1 Mic and Line inputs,
when a ¼” mono TS (tip-sleeve) plug is connected to the Hi-Z Instrument jack (14) on
the front panel.
• To control both channels simultaneously when a stereo source is connected, press the
Link button (13-f) when an input is selected (3).
• Line outputs 3 & 4 are accessed and controlled via software only (Console or DAW).
• Refer to the Apollo Software Manual to learn how to configure the audio interface settings, use the Console application and Realtime UAD Processing, and more.
Apollo Twin MkII Hardware Manual
16
Quick Start
Controls & Connectors
Complete details about the Apollo Twin MkII hardware controls and all connector jacks
on the front and rear panels are provided in this chapter.
Note: To learn how to set input gain levels (mic, line, and Hi-Z) and output
volumes (monitors and headphones), see Setting Hardware I/O Levels in the Quick
Start chapter.
Controls Overview
Some Apollo Twin MkII controls have multiple functions. The function of each control
depends on the current operating mode and the current settings within that mode. To
control a particular function, the control must be activated.
Operating Modes
Apollo Twin MkII’s top panel has two operating modes: Preamp and Monitor. The
function and availability of the top panel controls vary depending on the active operating
mode. The active mode is selected with the PREAMP and MONITOR buttons. Press the
button to activate the mode. Each mode is explained in greater detail below.
Note: All top panel functions can be operated concurrently (without switching
modes) from within the companion Console software application. See the Apollo
Software Manual for details.
PREAMP Mode
When Apollo Twin MkII is in Preamp mode, all top panel controls are related
to the input functions only. To adjust any input function, press the PREAMP
button to enter preamp mode and activate the input channel controls.
Note: Monitor and headphone functions cannot be performed in preamp
mode.
Preamp Channels
Apollo Twin MkII has two independent analog input channels. Each input channel has a
preamplifier. Both input channels can be independently controlled and used at the same
time for A/D conversion.
Preamp Controls
Apollo Twin MkII has one set of input channel preamp controls. The input channel
controls adjust all preamp functions for the currently selected input channel.
Apollo Twin MkII Hardware Manual
17
Controls & Connectors
Selected Channel
The currently selected input channel is shown by the CH1 and CH2
indicators at the upper left of the main display panel, above the input
meters. The top panel controls only adjust the functions for the currently
selected channel.
Changing Channels
When in Preamp mode, press the PREAMP button to change the selected channel so its
controls can be adjusted. Press PREAMP again to switch back to the other channel.
Input Source
The Mic, Line, or Hi-Z input is routed into the channel’s preamplifier. The
input source is shown by the indicators below the input meters.
The Mic or Line input source is selected by the pressing the INPUT button
when the channel is selected. The Hi-Z input (available on channel 1 only)
is selected automatically when and instrument cable is plugged into the
Hi-Z input on the front panel.
Note: Only one input type at a time (Mic, Line, or Hi-Z) can be used as a
channel’s input source.
Preamp Options
MONITOR
Each input channel has a set of preamp
options. The preamp options for the
currently selected input channel are
activated using the row of six buttons
at the bottom of the top panel when in
PREAMP mode.
The current state of the preamp options are indicated in the upper row of the options
display panel above the option buttons. Available options are dim when inactive, bright
when enabled, and unlit when unavailable.
Note: Not all preamp options are available with all input types. For specific
details, see the Top Panel Controls section later in this chapter.
Apollo Twin MkII Hardware Manual
18
Controls & Connectors
MONITOR Mode
When Apollo Twin MkII is in Monitor mode, all top panel controls are related
to output functions only. To adjust any output function, press the MONITOR
button to enter Monitor mode and activate the monitor controls.
MONITOR
Note: Input functions cannot be performed in Monitor mode.
Important: Apollo Twin MkII must be in Monitor mode to change the volume of the
monitor and headphone outputs.
Stereo Outputs
Apollo Twin MkII has two stereo outputs that can be controlled with the top panel
hardware: Monitor and Headphone. The stereo outputs are independently controlled.
Note: Line outputs 3 and 4 are controlled with software only.
Output Controls
The Level knob is used to set the volume level for each stereo output independently. The
Level knob adjusts the volume for the currently selected stereo output. After switching
the selected output with the MONITOR button, the other output volume can be adjusted.
Output Selection
The currently selected stereo output is shown by the MONITOR and
HEADPHONE indicators at the right of the main display, above and below
the output meters.
When in Monitor mode, press the MONITOR button to change the selected
output. Press again to switch to the other output. The Level knob adjusts
volume for the currently selected output.
MONITOR
Monitor Options
Apollo Twin MkII has monitor options
that perform the functions of dedicated
monitor controller. The monitor options
are controlled using the row of six buttons
at the bottom of the top panel when in
MONITOR mode.
MONITOR
The current state of the monitor options are indicated in the lower row of the options
display panel above the option buttons. Available options are dim when inactive, bright
when enabled, and unlit when unavailable.
Note: Not all monitor options are always available. For specific details, see the Top
Panel Controls section later in this chapter.
Apollo Twin MkII Hardware Manual
19
Controls & Connectors
Top Panel
Refer to the illustration below for control descriptions in this section.
1
2
3
4
5
8
9
10
6
7
MONITOR
11
12
13
Top panel elements
(1) Level Knob
The Level knob controls multiple functions. The knob’s current function is selected with
the PREAMP (7) and MONITOR (11) buttons.
When in PREAMP Mode, rotate clockwise to increase the amount of preamp gain for the
currently selected channel. When in MONITOR Mode, rotate clockwise to increase the
monitor output level or headphone output level, depending on the output selected with
the MONITOR (11) button.
Unison Integration
The Level knob can also be used to control Unison-enabled UAD preamp and
guitar amp plug-ins. See the Apollo Software Manual for complete Unison
details.
(2) Preamp Gain & Volume Level Indicator LEDs
The LEDs around the Level knob indicate the relative level of the selected function
(input preamp gain or monitor/headphone volume).
Note: The indicator LEDs are RED when MONITOR (11) is selected and MUTE
(13-l) is enabled.
Apollo Twin MkII Hardware Manual
20
Controls & Connectors
(3) Channel Selection Indicators
The currently selected input channel is indicated by the lit channel name above its input
meter (CH1 or CH2). Press the Preamp button (7) to switch between channels 1 & 2.
(4) Input Meters
These meters display the incoming signal level for input channels 1 & 2. Reduce the
channel’s preamp gain (see Setting Levels) if its red clip LED illuminates.
(5) Input Type Indicators
These indicators show which input type (MIC, LINE, or HI-Z) is active for the selected
channel. Use the Input Select button (13-a) to change the input type.
Note: Hi-Z input is available for channel 1 only.
(6) Talkback Microphone
The built-in talkback mic is located beneath this hole. The talkback function is
configured in the included Console software and can be activated with the TALK button
(13-g) when MONITOR mode (12) is active.
Caution: The talkback microphone is sensitive. To avoid equipment damage, do
not insert any object into the mic hole, apply pressurized air into the mic hole, or
use a vacuum over the mic hole.
(7) PREAMP Button
Press this button to enter PREAMP mode and activate the input channel controls. Press
again to alternate between channels 1 & 2.
(8) MONITOR Selected Indicator
When MONITOR is lit, the Level knob (1) controls volume the monitor outputs (16).
Press the MONITOR button (10) to activate the monitor controls.
Note: The MONITOR indicator is RED when the monitor outputs are muted.
(9) Stereo Output Meters
These meters display the main stereo signal output levels.* Main output levels are
independent of monitor and headphone volume levels. Reduce levels feeding the
output(s) if a red “C” (clip) LED at the top of the Output Meters illuminates.
*Exception: If HEADPHONE is currently selected on Apollo Twin MkII and the
Headphone Source within the CUE OUTPUTS window in Console is set to HP,
these output meters indicate the level being sent to the headphone bus via
Console’s headphone sends and/or the DAW.
Apollo Twin MkII Hardware Manual
21
Controls & Connectors
(10) Headphone Selected Indicator
When HEADPHONE is lit, the Level knob (1) controls the volume of the headphones
output (14). Press the MONITOR button (9) to activate the headphones volume control
(you may need to push it twice).
(11) Monitor Button
Press this button to enter MONITOR mode for controlling the monitor and headphone
functions. Press again to alternate between control of monitor and headphone volumes
with the Level knob (1).
Tip: Indicators (8) and (10) determine which volume (monitor or headphone) is
being controlled with the Level knob (1).
(12) Options Display
This panel displays the state of the preamp and monitor options, which are controlled by
the Option Buttons (13).
In PREAMP Mode the upper row displays the preamp options and the lower row is unlit.
In MONITOR Mode, the lower row displays the monitor options and the upper row is
unlit.
(13) Option Buttons
Each of the six Option Buttons has dual functions. In PREAMP Mode, the buttons
control the preamp options for the currently selected input channel. In MONITOR Mode,
the buttons control the monitor options. The individual options for both modes are
detailed in this section.
Unison Integration
In PREAMP mode, the Option Buttons can also be used to control Unisonenabled UAD preamp and guitar amp plug-ins. See the Apollo Software Manual
for complete Unison details.
MONITOR
Options Display (12) and Option Buttons (13)
Apollo Twin MkII Hardware Manual
22
Controls & Connectors
Preamp Options
The Option Buttons control the PREAMP options (a – f below) for an input channel when
that channel is selected (3) with the PREAMP button (7). A preamp option is active
when its indicator in the upper row of the Options Display (12) is lit, and inactive when
the indicator is dim. If the indicator is unlit, the option is unavailable.
Note: In MONITOR Mode, the preamp options cannot be modified and the upper
row of the Options Display is unlit.
a
(a) INPUT Select
g
b
h
c
d
Preamp options
i
j
e
f
k
l
Selects the active input jack for the channel. Press to alternate between the mic and line
inputs. The current selection is displayed by the input type indicators (5).
The Hi-Z input is selected automatically whenever a ¼” mono (tip-sleeve) plug is
connected to the front panel’s Hi-Z Instrument jack (14).
Note: Hi-Z input is available for channel 1 only.
(b) FILTER
Enables a low cut (high pass) rumble filter with a cutoff frequency of 75 Hz.
(c) +48V
Enables +48-volt phantom power for the mic input. Phantom power is typically needed
for condenser microphones. +48V is available for the microphone inputs only.
Caution: To avoid potential equipment damage, disable +48V phantom power on
the channel before connecting or disconnecting its XLR input.
(d) PAD
Attenuates (lowers) the mic input signal level by 20 dB. Pad is unavailable for the line
inputs and the Hi-Z instrument input.
(e) POLARITY Ø
Inverts the polarity (aka “phase”) of the input signal. Polarity inversion can help reduce
phase cancellations when more than one microphone is used to record a single source.
(f) LINK
Links input channels 1 and 2 as a stereo pair. When the inputs are stereo linked, all
input control adjustments are applied to both input channels equally.
Note: The Hi-Z instrument input cannot be linked to a mic or line input.
Therefore, LINK cannot be activated when a plug is inserted in the Hi-Z jack (14).
Apollo Twin MkII Hardware Manual
23
Controls & Connectors
Monitor Options
The Option Buttons control the monitor options (g – h below) when Apollo Twin MkII is in
MONITOR Mode. Press the MONITOR button (11) to enter monitor mode.
A monitor option is active when its indicator in the lower row of the Options Display
(12) is lit, and inactive when the indicator is dim. If the indicator is unlit, the option is
unavailable.
The TALK, DIM, ALT, and FCN functions are configured in the companion Console
software application. See the Apollo Software Manual for details.
a
b
c
d
e
f
g
h
i
j
k
l
Note: In PREAMP Mode, the monitor options cannot be modified and the lower
row of the Options Display is unlit.
Monitor options
(g) TALK
Activates the built-in talkback microphone and the DIM function. Press and release the
button quickly to latch the function. To momentarily activate the function and deactivate
when the button is released, press for longer than 0.5 seconds.
(h) DIM
Reduces the monitor output volume level. Press and release the button quickly to latch
the function. To momentarily activate the function and deactivate when the button is
released, press for longer than 0.5 seconds.
(i) ALT (Alternate)
Switches the main monitor mix to an alternate set of outputs. This function is only
available when the ALT COUNT setting in the Hardware panel within the Console
Settings window is set to a non-zero value.
(j) FCN (Function)
This switch can be assigned to control one of three monitoring functions. FCN is only
available when Apollo Twin MkII is combined with other Thunderbolt-equipped Apollo
models in a multi-unit cascading configuration.
(k) MONO
Sums the left and right signals of the stereo monitor mix into a monophonic signal.
MONO applies to the monitor outputs only. It does not apply to the headphone outputs.
(l) MUTE
Mutes the monitor outputs. When MUTE is active, the MONITOR Selected Indicator (8)
is always RED (including when in Preamp Mode. When MUTE is active in Monitor Mode,
the Volume Level Indicators (2) are also RED.
Note: MUTE does not apply to the headphone outputs.
Apollo Twin MkII Hardware Manual
24
Controls & Connectors
Front Panel
Refer to the illustration below for control descriptions in this section.
14
15
Front panel elements
(14) Hi-Z Instrument Input
Connect any guitar, bass, or other high impedance instrument here. This jack
automatically overrides the channel 1 mic and line inputs.
Levels for the Hi-Z input are set using the same method as the mic and line inputs.
Note: This jack accepts a ¼” mono (tip-sleeve) plug only.
(15) Headphone Output
Connect ¼” stereo headphones here. Volume is set with the Level knob (1) when
Headphone (10) is selected with the Monitor button (11).
Side Panel
Kensington Security Slot (not shown)
The anti-theft security slot on the side panel connects to any standard Kensington lock.
Apollo Twin MkII Hardware Manual
25
Controls & Connectors
Rear Panel
Refer to the illustration below for control descriptions in this section.
Note: All rear panel ¼” jacks can accept unbalanced TS (tip-sleeve) or balanced
TRS (tip-ring-sleeve) connections.
22
21
LINE OUT
3
MONITOR
L
4
R
OPTICAL IN
POWER
20
OFF
MIC/LINE 2
MIC/LINE 1
ON 12VDC
19
18
17
16
Rear panel elements
(16) Mic/Line Inputs 1 & 2
The jacks for channels 1 & 2 accept either a male XLR plug for connecting to the mic
input, or a ¼” phone plug for connecting to the line input.
The input that is used for the channel (mic or line) is specified with the Input Select
button (13-a).
Caution: To avoid potential equipment damage, disable +48V phantom power on
the channel before connecting or disconnecting its XLR input.
(17) Monitor Outputs
Connect the powered monitor speakers (or speaker amplifiers) here. Volume is set with
the Level knob (1) when Monitor is selected (8) with the Monitor button (11).
(18) Line Outputs 3 & 4
These ¼” phone outputs are accessed via software (Console or DAW). Line outputs 3 & 4
are used to send audio to other equipment.
(19) Power Supply Input
The included power supply must be connected here (Apollo Twin MkII cannot be bus
powered). Rotate locking connector to prevent accidental disconnection.
Important: After ensuring the locking barrel tabs are aligned with the chassis slots
and the barrel is fully inserted, rotate the barrel to secure the connector to the
chassis.
2. Rotate to Lock
1. Align Tabs
12VDC
Apollo Twin MkII Hardware Manual
26
Controls & Connectors
(20) Power Switch
This rocker switch applies power to Apollo Twin MkII. Switch to OFF when not in use.
Caution: Before powering Apollo Twin MkII, lower the volume of the monitor
speakers and remove headphones from your ears.
(21) Optical In
This is a TOSLINK input for connection to other gear with an optical ADAT or S/PDIF
output.
Note: The connection protocol to be used (ADAT or S/PDIF) is specified in the
Hardware panel within Console Settings.
(22) Thunderbolt Port
Connect the Thunderbolt cable (not included) here. A Thunderbolt connection to the host
computer is required to use all Apollo Twin MkII features and UAD Powered Plug-Ins.
• Apollo Twin MkII can be connected to a Thunderbolt 1 or Thunderbolt 2 port.
• Apollo Twin MkII can be connected to compatible Thunderbolt 3 equipped
computers via a qualified Thunderbolt 3 to Thunderbolt adapter.
Apollo Twin MkII Hardware Manual
27
Controls & Connectors
Specifications
Specification Tables
All audio specifications are typical performance unless otherwise noted, tested under the
following conditions: 48 kHz internal sample rate, 24-bit sample depth, 20 kHz measurement bandwidth, with balanced inputs and outputs.
SYSTEM
I/O Complement
Microphone Inputs
Two
Analog Line Inputs
Two
Hi-Z Instrument Inputs
One
Analog Line Outputs
Two
Analog Monitor Outputs
Two (one stereo pair)
Headphone Outputs
One stereo
Digital Input Port (TOSLINK optical)
One (ADAT or S/PDIF, selectable)
Thunderbolt Port
One (Thunderbolt 1 and 2 compatible)
A/D – D/A Conversion
Supported Sample Rates (kHz)
44.1, 48, 88.2, 96, 176.4, 192
Bit Depth Per Sample
24
Simultaneous A/D conversion
Two channels
Simultaneous D/A conversion
Six channels
Analog Round-Trip Latency
1.1 milliseconds @ 96 kHz sample rate
Analog Round-Trip Latency with up to four serial
UAD Powered Plug-Ins via Console application
1.1 milliseconds @ 96 kHz sample rate
(continued)
Apollo Twin MkII Hardware Manual
28
Specifications
ANALOG I/O
Frequency Response
20 Hz – 20 kHz, ±0.1 dB
Line Inputs 1 & 2
Connector Type
¼” Female TRS Balanced (Combo XLR/TRS)
Dynamic Range
117.5 dB (A–weighting)
Signal-to-Noise Ratio
117.5 dB (A–weighting)
Total Harmonic Distortion + Noise
–109 dBFS
Input Impedance
10K Ohms
Gain Range
+10 dB to +65 dB
Reference Level
+4 dBu
Maximum Input Level
+20.2 dBu
Microphone Inputs 1 & 2
Connector Type
XLR Female, pin 2 positive (Combo XLR/TRS)
Phantom Power
+48V (switchable per mic input)
Dynamic Range
118 dB (A–weighting)
Signal-to-Noise Ratio
118 dB (A–weighting)
Total Harmonic Distortion + Noise
–111 dBFS
Equivalent Input Noise
–127 dBu
Common-Mode Rejection Ratio (CMRR)
Greater than 70 dB (10’ cable)
Default Input Impedance
5.4K Ohms (variable via Unison plug-ins)
Gain Range
+10 dB to +65 dB
Pad Attenuation (switchable per input)
20 dB (variable via Unison plug-ins)
Maximum Input Level
+25 dBu (minimum gain, pad engaged)
Hi-Z Input
Connector Type
Female ¼” TS Unbalanced
Dynamic Range
117 dB (A–weighting)
Signal-to-Noise Ratio
117 dB (A–weighting)
Total Harmonic Distortion + Noise
–101 dBFS
Input Impedance
1M Ohms (variable via Unison plug-ins)
Gain Range
+10 dB to +65 dB
Maximum Input Level
+12.2 dBu
(continued)
Apollo Twin MkII Hardware Manual
29
Specifications
ANALOG I/O
Frequency Response
20 Hz – 20 kHz, ±0.1 dB
Line Outputs 3 & 4
Connector Type
¼” Female TRS Balanced
Dynamic Range
121 dB (A–weighting)
Signal-to-Noise Ratio
121 dB (A–weighting)
Total Harmonic Distortion + Noise
–110 dBFS
Stereo Level Balance
±0.05 dB
Output Impedance
600 Ohms
Maximum Output Level
20.2 dBu
Monitor Outputs 1 & 2
Connector Type
¼” Female TRS Balanced
Dynamic Range
115 dB (A–weighting)
Signal-to-Noise Ratio
115 dB (A–weighting)
Total Harmonic Distortion + Noise
–105 dBFS
Stereo Level Balance
±0.05 dB
Output Impedance
600 Ohms
Maximum Output Level
+20.2 dBu
Operating Reference Level
+14 dBu, +20 dBu (selectable)
Stereo Headphones Output
Connector Type
¼” Female TRS Stereo
Dynamic Range
113 dB (A–weighting)
Signal-to-Noise Ratio
113 dB (A–weighting)
Total Harmonic Distortion + Noise
–105 dBFS
Maximum Output Power
80 milliwatts into 600 ohm load
(continued)
Apollo Twin MkII Hardware Manual
30
Specifications
DIGITAL INPUTS
S/PDIF
Connector Type
Optical TOSLINK JIS F05 (shared with ADAT)
Format
IEC958
Supported Sample Rates (kHz)
44.1, 48, 88.2, 96
S/PDIF Input Channels
Two (Stereo L/R)
ADAT
Connector Type
Optical TOSLINK JIS F05 (shared with S/PDIF)
Format
ADAT Digital Lightpipe with S/MUX
Supported Sample Rates (kHz)
44.1, 48, 88.2, 96, 176.4, 192
ADAT Input Channels @ 44.1 kHz, 48 kHz
1–8
ADAT Input Channels @ 88.2 kHz, 96 kHz
1 – 4 (S/MUX)
ADAT Input Channels @ 176.4 kHz, 192 kHz
1 – 2 (S/MUX)
Clock Synchronization Sources
Internal, S/PDIF, ADAT (digital clock sync source conditional per selected digital input type)
ELECTRICAL
Power Supply
External AC to DC
AC Connector Type
Changeable blades (UL, VDE, UK, SSA, CCC)
AC Requirements
100V – 240V AC, 50 – 60 Hz
DC Connector Type
Male plug, 2.1 mm x 5.5 mm, center positive
DC Requirements
12 VDC, ±5%
Maximum Power Consumption
12 Watts
ENVIRONMENTAL
Operating Temperature Range
32º to 95º Fahrenheit (0º to 35º Celsius)
Storage Temperature Range
-40º to 176º Fahrenheit (-40° to 80º Celsius)
Operating Humidity Range
20% to 80%
MECHANICAL
Dimensions
Width
6.31”
Height
2.60”
Depth, Chassis Only
5.86”
Depth, Including Knob & Jack Protrusions
6.20”
Shipping Box (Length x Width x Height)
8” x 8” x 5.5” (20.32cm x 20.32cm x 13.97cm)
Weight
Shipping Weight (with box & accessories)
3.85 pounds
Weight (bare unit)
2.35 pounds
Package Contents
Apollo Twin MkII Unit (SOLO, DUO, or QUAD)
External Power Supply with (4) changeable AC connectors supporting USA, Europe, UK, Australia, China
Getting Started URL Card
Apollo Twin MkII Hardware Manual
31
Specifications
Apollo Twin MkII Hardware Manual
32
PAD
MIC/LINE
SELECT
INPUT GAIN
10 – 65 dB
HI-Z/MIC HI-Z/MIC-LINE INPUT GAIN
10 – 65 dB
SELECT
SELECT
A/D
A/D
Apollo Twin MkII Hardware Block Diagram
THUNDERBOLT TM
HOST INTERFACE
OPTO
OPTICAL INPUT
1/4” TRS
LINE IN 2
1M
PAD
+48V
+48V ON/OFF
MIC PAD
IN/OUT
XLR FEMALE
MIC IN 2
1/4” TRS
LINE IN 1
1/4”
HI-Z IN
XLR FEMALE
MIC IN 1
+48V
+48V ON/OFF
MIC PAD
IN/OUT
ANALOG INPUTS
v03
DSP
ø
LOW-CUT POLARITY
ON/OFF CONTROL
INTERNAL
TALKBACK MIC
DSP
ø
LOW-CUT POLARITY
ON/OFF CONTROL
SYSTEM CONTROL
CLOCKING / SYNC
MIXER
DRAM
DRAM
DRAM
SHARC®
DSP
SHARC®
DSP
SHARC®
DSP
EEPROM
ARM®
PROCESSOR
DRAM
D/A
D/A
D/A
D/A
SHARC®
DSP
D/A
D/A
PAD
+4dBu / -10dBV
SELECT
PAD
+4dBu / -10dBV
SELECT
PAD
+4dBu / -10dBV
SELECT
PAD
+4dBu / -10dBV
SELECT
1/4” TRS
MON OUT L
1/4” TRS
HEADPHONES OUT
1/4” TRS
LINE OUT 4
1/4” TRS
LINE OUT 3
1/4” TRS
MON OUT R
FRONT PANEL
OUTPUT
VOLUME
OUTPUT
VOLUME
ANALOG OUTPUTS
Hardware Block Diagram
Specifications
Troubleshooting
If Apollo Twin MkII isn’t behaving as expected, some common troubleshooting items
to confirm are below. If you are still experiencing issues after performing these checks,
contact Technical Support.
SYMPTOM
ITEMS TO CHECK
Unit won’t power on
•Confirm power supply connector is fully inserted, then twist barrel to lock
•Confirm Power switch is in “ON” position
•Confirm AC power is available at wall socket by plugging in a different device
Unit is not recognized by
computer
•Confirm Thunderbolt cable is fully inserted at both ends
•Confirm latest Apollo Twin MkII software is installed (reinstall if necessary)
•Power down system, power on Apollo Twin MkII, then start computer
•Try a different Thunderbolt cable
No monitor output
•Confirm
•Confirm
•Confirm
•Confirm
Can't hear mic or line
input(s)
•Confirm mic/line switch setting is correct for the channel
•Confirm preamp gain is turned up for the channel(s)
•On channel 1, confirm nothing is plugged into the Hi-Z input
Can’t hear mic input(s)
•Confirm +48V phantom power is enabled if required by microphone
Can't hear Hi-Z input
•Confirm volume on connected device is turned up
•Confirm Hi-Z input cable is 1/4” TS (TRS cables cannot be used with Hi-Z input)
Preamp controls have no
effect on channel
•Confirm desired channel is selected for control
(push PREAMP button to select channel when in PREAMP mode)
Can’t adjust digital input
levels
•Signal levels for digital inputs are adjusted at the device connected to those inputs
•UAD plug-ins can be used to add signal gain if desired
Audio glitches and/or
dropouts during DAW
playback
•Increase I/O Hardware Buffer value in DAW
•If syncing to external digital clock via optical input, confirm clocking setups
(confirm optical cable connections, matching sample rates, and that all devices are
synchronized to one master clock device)
Undesirable echo/phasing
•Confirm input monitoring is not enabled in both Console and DAW
Static and/or white noise
is heard when nothing is
plugged in
•Mute or lower preamp gain to minimum on unused preamp channels
(mic preamps can emit noise even when nothing is plugged in)
•Some UAD plug-ins model the noise characteristics of the original equipment
(defeat the noise model in the UAD plug-in interface, or mute the channel
containing the plug-in to temporarily mute the noise)
connections, power, and volume of monitoring system
Apollo Twin MkII monitor level is turned up
monitor outputs are not muted (push MUTE button when in monitor mode)
monitor LEDs are active (check signal flows)
Various LEDs inside the unit
•This is normal operational behavior and can be safely ignored
are blinking
Apollo Twin MkII is
behaving unexpectedly
•As a last resort, perform a hardware reset on the unit by following these steps:
1. Power off Apollo Twin MkII
2. Press and hold the PREAMP, FILTER, and POLARITY buttons
3. Power on Apollo Twin MkII while continuing to hold all three controls
4. After all front panel LEDs flash rapidly for several seconds, release the controls
Apollo Twin MkII Hardware Manual
33
Troubleshooting
Notices
Important Safety Information
Before using this unit, be sure to carefully read the applicable items of these operating
instructions and the safety suggestions. Afterwards, keep them handy for future
reference. Take special care to follow the warnings indicated on the unit, as well as in
the operating instructions.
Water and Moisture – Do not use the unit near any source of water or in excessively moist
environments.
Object and Liquid Entry – Care should be taken so that objects do not fall, and liquids
are not spilled, into the enclosure through openings.
Ventilation – When installing the unit in a rack or any other location, be sure there is
adequate ventilation. Improper ventilation will cause overheating, and can damage the
unit.
Heat – The unit should be situated away from heat sources, or other equipment that
produces excessive heat.
Power Sources – The unit should be connected to a power supply only of the type
described in the operating instructions, or as marked on the unit.
Power Cord Protection – AC power supply cords should be routed so that they are not
likely to be walked on or pinched by items placed upon or against them. Pay particular
attention to cords at plugs, convenience receptacles, and the point where they exit from
the unit. Never take hold of the plug or cord if your hand is wet. Always grasp the plug
body when connecting or disconnecting it.
Cleaning – Follow these general rules when cleaning the outside of the unit:
a. Turn the power off and unplug the unit
b. Gently wipe with a clean lint-free cloth
c. Do not use aerosol sprays, solvents, or abrasives
Nonuse Periods – The AC power supply cord of the unit should be unplugged from the
AC outlet when left unused for a long period of time.
Damage Requiring Service – The unit should be serviced by a qualified service personnel
when:
a. The AC power supply unit has been damaged; or
b. Objects have fallen or liquid has been spilled into the unit; or
c. The unit has been exposed to rain; or
d. The unit does not operate normally or exhibits a marked change in performance; or
e. The unit has been dropped, or the enclosure damaged.
Servicing – The user should not attempt to service the unit beyond that described in
the operating instructions. All other servicing should be referred to qualified service
personnel.
Apollo Twin MkII Hardware Manual
34
Notices
Warranty
Universal Audio provides a warranty on all hardware products. To learn more, please visit
www.uaudio.com/support/warranty.html or contact Technical Support. This limited
warranty gives you specific legal rights. You may also have other rights which vary by
state or country.
Maintenance
Apollo Twin MkII does not contain a fuse or any other user-replaceable parts. The unit is
internally calibrated at the factory. No internal user adjustments are available.
Repair Service
If you are having trouble with Apollo Twin MkII, the first check all system setups,
connections, software installations, and the Troubleshooting chart. If that doesn’t help,
contact Technical Support. To learn more about repair service, please visit:
• www.uaudio.com/support/rma-faq.html
FCC Compliance
Federal Communications Commission
United States Class B Manual Statement
NOTE: This equipment has been tested and found to comply with the limits for a Class
B digital device pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on,
the user is encouraged to try and correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Any modifications to the unit, unless expressly approved by Universal Audio, could void
the User’s authority to operate the equipment.
Apollo Twin MkII Hardware Manual
35
Notices
Disclaimer
The information contained in this manual is subject to change without notice. Universal
Audio, Inc. makes no warranties of any kind with regard to this manual, including, but
not limited to, the implied warranties of merchantability and fitness for a particular
purpose. Universal Audio, Inc. shall not be liable for errors contained herein or direct,
indirect, special, incidental, or consequential damages in connection with the furnishing,
performance, or use of this material.
End User License Agreement
Your rights to the Software are governed by the accompanying End User License Agreement, a copy of which can be found at: www.uaudio.com/eula
Trademarks
Universal Audio, the Universal Audio “diamond” logo, Apollo, Apollo Twin, Apollo 16,
Unison technology, UAD, UAD Series, UAD-1, UAD-2, UAD-2 Satellite, Powered PlugIns, 1176LN, 1176SE, Teletronix, LA-2A, LA-3A, LA-610, LA-610MkII, 2-1176,
2-610, 6176, 710 Twin-Finity, 2192, 4-710d, Cambridge EQ, DreamVerb, Plate
140, Precision Limiter, RealVerb Pro, Precision Buss Compressor, Precision De-Esser,
Precision Maximizer, and “Analog Ears | Digital Minds,” are among the trademarks, trade
names, and service marks owned by UA that may appear on the Site, many of which are
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all UA trademarks. All UA trademarks inure to the benefit of UA. Other trademarks and
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Copyright
Copyright ©2017 Universal Audio, Inc. All rights reserved.
This manual and any associated software, artwork, product designs, and design concepts
are subject to copyright protection. No part of this document may be reproduced, in any
form, without prior written permission of Universal Audio, Inc.
Apollo Twin MkII Hardware Manual
36
Notices
Technical Support
Universal Audio Knowledge Base
The UA Knowledge Base is your complete technical resource for configuring, operating,
and troubleshooting UA products.
You can watch helpful support videos, search the Knowledge Base for answers, find
updated technical information that may not be available in other publications, and more.
• help.uaudio.com
YouTube Support Channel
The Universal Audio Support Channel at youtube.com includes helpful support videos for
setting up and using UA products.
• Universal Audio YouTube Support Channel
UAD Community Forums
The unofficial UAD discussion forums are a valuable resource for all Universal Audio
product users. This website is independently owned and operated.
• www.uadforum.com
Contact UA Support
Universal Audio provides free technical support to registered product owners. Support
specialists are available to answer technical inquiries via email and telephone.
• help.uaudio.com
Apollo Twin MkII Hardware Manual
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Technical Support
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