RME Audio ADI-8 QS User manual

User’s Guide
ADI-8 QS
The Professional’s Converter Solution
Professional 8-Channel AD/DA Converter
Reference Low Latency Conversion
8-Channel Analog <> AES / ADAT Interface
Optional 64-Channel MADI Interface
24 Bit / 192 kHz Digital Audio
MIDI Remote Control
24 Bit Interface
TotalRemote™I64 Option Slot™
FlexGain™SteadyClock™SyncCheck™
AES-3
AES-10

2 User’s Guide ADI-8 QS © RME
Important Safety Instructions ..................................4
General
1 Introduction ...............................................................6
2 Package Contents.....................................................6
3 Brief Description and Characteristics.....................6
4 First Usage – Quick Start
4.1 Controls - Connectors - Displays............................7
4.2 Quick Start ..............................................................9
5 Accessories.............................................................10
6 Warranty...................................................................11
7 Appendix..................................................................11
Usage and Operation
8 Front Panel Controls
8.1 Input .....................................................................14
8.2 Limiter...................................................................14
8.3 Input State............................................................15
8.4 Meter....................................................................15
8.5 Remote.................................................................15
8.6 Clock Section.......................................................15
8.7 Digital Input..........................................................16
8.8 Output State.........................................................16
8.9 Set (Rotary Encoder) ...........................................16
8.10 Output...................................................................17
9 The Setup Menu
9.1 Exit .......................................................................17
9.2 Global Output Level .............................................17
9.3 Input Trim.............................................................18
9.4 Output Trim..........................................................18
9.5 ID (Id) ...................................................................18
9.6 Bank (bA).............................................................19
9.7 Auto ID (Au) .........................................................19
9.8 Delay Compensation (dC)....................................19
9.9 Follow Clock (FC).................................................20
9.10 Word Clock Out (Co)............................................20
9.11 Trim Enable (TE)..................................................21
9.12 Global Output Level Enable (GE) ........................21
9.13 Direct Level (dL)...................................................21
9.14 Effects (FX) ..........................................................21
9.15 Digital to Digital (dd).............................................22
10 Remote Control
10.1 Hardware Remote................................................23
10.2 MIDI......................................................................23
10.3 MIDI over MADI....................................................23
10.4 Remote Control Software.....................................24

User’s Guide ADI-8 QS © RME 3
Inputs and Outputs
11 Analog Inputs / Outputs
11.1 Line In..................................................................28
11.2 Line Out ...............................................................29
12 Digital Inputs / Outputs
12.1 AES / EBU ...........................................................30
12.2 ADAT Optical.......................................................31
12.3 I64 MADI Card.....................................................32
12.4 Differences I64 MADI Card / ADI-642 .................33
13 Word Clock
13.1 Word Clock Input and Output ..............................34
13.2 Technical Description and Background...............35
13.3 Cables and Termination.......................................36
14 MIDI...........................................................................37
15 Remote.....................................................................37
Technical Reference
16 Technical Specifications
16.1 Analog..................................................................40
16.2 Digital Inputs........................................................41
16.3 Digital Outputs .....................................................42
16.4 Digital...................................................................42
16.5 MIDI .....................................................................42
16.6 General................................................................43
16.7 Firmware..............................................................43
16.8 MADI User Bit Chart ............................................43
16.9 Connector Pinouts...............................................44
17 Technical Background
17.1 Terminology.........................................................46
17.2 Lock and SyncCheck...........................................47
17.3 Latency and Monitoring .......................................48
17.4 DS – Double Speed.............................................49
17.5 QS – Quad Speed ...............................................49
17.6 AES/EBU – SPDIF...............................................50
17.7 Signal to Noise ratio in DS / QS Operation..........51
17.8 MADI Basics ........................................................52
17.9 SteadyClock.........................................................53
18 Block Diagram.........................................................54
19 MIDI Implementation ADI-8 QS
19.1 Basic SysEx Format ............................................55
19.2 Message Types ...................................................55
19.3 Table....................................................................56

4 User’s Guide ADI-8 QS © RME
Important Safety Instructions
ATTENTION! Do not open chassis – risk of electric shock
The unit has non-isolated live parts inside. No user serviceable parts inside.
Refer service to qualified service personnel.
Mains
• The device must be earthed – never use it without proper grounding
• Do not use defective power cords
• Operation of the device is limited to the manual
• Use same type of fuse only
To reduce the risk of fire or electric shock do not expose this device to rain or
moisture. Prevent moisture and water from entering the device. Never leave
a pot with liquid on top of the device. Do not use this product near water, i. e.
swimming pool, bathtub or wet basement. Danger of condensation inside –
don't turn on before the device has reached room temperature.
Installation
Surface may become hot during operation – ensure sufficient ventilation.
Avoid direct sun light and do not place it near other sources of heat, like ra-
diators or stoves. When mounting in a rack, leave some space between this
device and others for ventilation.
Unauthorized servicing/repair voids warranty. Only use accessories
specified by the manufacturer.
Read the manual completely. It includes all information necessary
to use and operate this device.

User’s Guide ADI-8 QS © RME 5
User’s Guide
ADI-8 QS
General

6 User’s Guide ADI-8 QS © RME
1. Introduction
RME's ADI-8 QS is an 8-channel high-end AD/DA converter with a truly unique feature set. The
device combines excellent analog circuit design with the latest generation of outstanding low
latency AD/DA converter chips. Along with its integrated SteadyClock, the ADI-8 QS offers AD
and DA conversion of the highest quality.
When developing the ADI-8 QS we used all our experience, and also the experience of our
customers, to create a unique, excellent and high-quality unit. Although the ADI-8 QS is built to
highest reference standards, it still offers the typical, outstanding price/performance ratio known
from RME. ADI-8 QS features will excite you – but even more the performance and smartness
that it shows in solving any given task. Have fun!
2. Package Contents
Please check that your ADI-8 QS package contains each of the following:
•ADI-8 QS
•Power cord
•Manual
•RME Driver CD
•1 optical cable (TOSLINK), 2 m
3. Brief Description and Characteristics
The ADI-8 QS is an 8-channel hi-end AD and DA converter in reference quality, fully remote
controllable. In a standard 19" box with 1 unit height the device offers numerous extraordinary
features like Intelligent Clock Control (ICC), SyncCheck®, SteadyClock, analog and digital Lim-
iter, four hardware reference levels up to +24 dBu, AES/EBU and ADAT I/O, optional MADI I/O,
192 kHz sample rate, MIDI remote control, digital input and output trimming for full level calibra-
tion, calibration, volume control for all 8 analog outputs, either separately or globally, and a digi-
tal thru-mode.
•8-channel AD converter, full symmetrical design, 117 dBA
•8-Kanal DA converter, DC coupled design, double balanced output, 120 dBA
•Low latency conversion: less than 12 samples delay
•4 x AES/EBU I/O per D-sub, 8 channels @ 192 kHz
•2 x ADAT I/O, 8 channels @ 96 kHz
•Optional MADI I/O (I64 MADI Card)
•Word clock input and output
•MIDI I/O
•Digital input/output trim over a range of 6 dB per I/O
•AD-conversion includes switchable analog and digital Limiter
•2 x 8-channel level meter with 7 LEDs per channel
•Noise suppression on power-on and power-off at the analog outputs
•Included Hardware remote for store/recall, volume and DIM
•Fully remote controllable via MIDI and MADI

User’s Guide ADI-8 QS © RME 7
4. First Usage – Quick Start
4.1 Controls - Connectors - Displays
The front of the ADI-8 QS features 16 LED level meters, nine select keys, one rotary encoder,
and 30 LEDs providing a detailed status display.
The analog input sensitivity can be changed in the area INPUT. Choosing DIG with the select
key, the digital input signal is routed to the digital outputs, with the AD-conversion being deacti-
vated.
The 8-channel LIMITER is available as analog (MODE ANA), digital (MODE DIG) or combined
(both LEDs lit) function.
The 8 level meter of the INPUT STATE
show the digital value (dBFS) of the
input level per channel. With activated
METER GR AUTO the amount of Gain
Reduction is shown in dB as soon as
the Limiter becomes active. METER PH
provides a Peak Hold function, either
permanently (ON) or switched off by
Auto Reset (AR) after 3 seconds.
When the Setup menu is active, the according parameter values are displayed in this level me-
ter window.
REMOTE defines the source for MIDI remote control operation (Option Slot/MADI or DIN jack).
In the CLOCK SECTION the current clock reference and frequency multiplier is chosen.
The digital input signal of the DA-converters is chosen by pushing the DIGITAL INPUT button.
The 8 level meter of the OUTPUT STATE show
the digital input level per channel as digital value
(dBFS). METER PH provides a Peak Hold
function, either permanently (ON) or switched off
by Auto Reset (AR) after 3 seconds.
When the Setup menu is active, all available
options are displayed in this level meter window.
Pushing the knob SET activates the Setup
Menu. The rotary encoder is a highly intuitive
multifunctional device. It is used to set the trim values, the volume, and various options in the
Setup menu.
The key ANALOG OUT defines the analog reference level at the analog outputs. This level is
reached at full scale of the AD-converters, thus matching the front panel level meter's level indi-
cation.

8 User’s Guide ADI-8 QS © RME
The rear panel of the ADI-8 QS has eight analog inputs, eight analog outputs, mains power, a
connector for the included Hardware Remote, MIDI I/O, word clock I/O, the I64 Option Slot, and
all digital inputs and outputs (AES/ADAT).
ANALOG INPUTS: Eight balanced Line inputs, 1/4" TRS inputs and D-sub.
ANALOG OUTPUTS: Eight balanced Line outputs, 1/4" TRS outputs and D-sub.
AES I/O (25-pin D-sub): The D-sub connector provides four AES/EBU outputs (AD signals) and
four AES/EBU inputs (DA signals). The 25 pin D-sub connector is wired according to the widely
spread Tascam standard (pinout see chapter 16.9). The AES I/Os are transformer-coupled. The
high sensitivity type input accepts all common digital sources, even SPDIF.
ADAT I/O MAIN (TOSLINK): Standard ADAT optical port.
ADAT I/O AUX (TOSLINK): Transmits further channels at activated sample multiplexing.
WORD IN (BNC): A push switch allows to activate internal termination (75 Ohms).
WORD OUT (BNC): Standard word clock output.
MIDI I/O (5-pin DIN): MIDI input and output via 5-pin DIN jacks. Used to remote control the ADI-
8 QS, and – with installed MADI Card - to transmit MIDI data via MADI.
REMOTE (Mini DIN): Jack to connect the included Hardware Remote.
IEC receptacle for power connection. The specially developed, internal hi-performance switch
mode power supply lets the ADI-8 QS operate in the range of 100V to 240V AC. It is short-
circuit-proof, has an integrated line-filter, is fully regulated against voltage fluctuations, and sup-
presses mains interference.
With installed I64 MADI Card:
MADI I/O optical: Standard MADI ports.
MADI I/O koaxial (BNC): Standard MADI ports.

User’s Guide ADI-8 QS © RME 9
4.2 Quick Start
After connection of all cables and power-on of the device, the configuration of the ADI-8 QS
begins in the CLOCK section. Choose a clock source and a sample rate.
Connect the TRS-jacks or the D-sub connector with the analog signal source. Change the input
sensitivity by pressing INPUT until the input level is sufficient to avoid noisy operation. Try to
achieve an optimum input level by adjusting the source itself. Raise the source’s output level
until the red Over LED flashes at the loudest parts of the signal, then reduce the level a bit until
no more overs are detected.
The analog line inputs of the ADI-8 QS can be accessed by using D-sub (for an optional XLR
multicore) and 1/4" TRS jacks. Both are internally connected, so not operational at the same
time. The electronic input stage is built in a servo balanced design which handles unbalanced
(mono TS) and balanced (XLR, stereo TRS jacks) correctly, automatically adjusting the level
reference.
When switched on for the first time the ADI-8 DS starts in a default mode which should be suit-
able for most applications:
•AD/DA conversion in master mode (CLOCK INTERNAL)
•Sample rate 48 kHz
•Input ADAT optical
•Level reference +19 dBu
On the DA-side just choose the desired digital input by pressing DIGITAL INPUT. A coarse
correction of the analog output level can be done by pressing the OUTPUT button.
The ADI-8 QS stores all current settings and automatically activates them when the device is
turned on.

10 User’s Guide ADI-8 QS © RME
5. Accessories
RME offers several optional components for the ADI-8 QS:
Part Number Description
OK0050 Optical cable, Toslink, 0.5 m (1.7 ft)
OK0100 Optical cable, Toslink, 1 m (3.3 ft)
OK0200 Optical cable, Toslink, 2 m (6.6 ft)
OK0300 Optical cable, Toslink, 3 m (9.9 ft)
OK0500 Optical cable, Toslink, 5 m 16.4 ft)
OK1000 Optical cable, Toslink, 10 m (32.8 ft)
BO25MXLR4M4F1PRO Digital Breakout Cable Pro, AES/EBU
25-pin D-sub to 4 x XLR male + 4 x XLR female, 1m (3.3 ft)
BO25MXLR4M4F3PRO same, 3 m (9.9 ft)
BO25MXLR4M4F6PRO same, 6 m (19.8 ft)
BO25M25M1PRO Digital D-sub Cable Pro, AES/EBU,
25-pin D-sub to 25-pin D-sub, 1m (3.3 ft)
BO25M25M3PRO same, 3m (9.9 ft)
BO25M25M6PRO same, 6m (19.8 ft)
BO25MXLR8M3 Analog Breakout Cable, 25-pin D-sub to 8 x XLR male, 3 m (9.9 ft)
BO25MXLR8M6 same, 6 m (19.8 ft)
BO25MXLR8M10 same, 10 m (33 ft)
BO25MXLR8F3 Analog Breakout Cable 25-pin D-sub to 8 x XLR female, 3 m (9.9 ft)
BO25MXLR8F6 same, 6 m (19.8 ft)
BO25MXLR8F10 same, 10 m (33 ft)
I64 MADI Card MADI module featuring thru-input, Delay Compensation, Auto ID, MIDI
over MADI, remote via MADI
BOB32 BOB-32, Universal breakout box, 19" 1 Unit height. The professional
digital AES/EBU breakout solution

User’s Guide ADI-8 QS © RME 11
6. Warranty
Each individual ADI-8 QS undergoes comprehensive quality control and a complete test at IMM
before shipping. The usage of high grade components allows us to offer a full two year war-
ranty. We accept a copy of the sales receipt as valid warranty legitimation.
If you suspect that your product is faulty, please contact your local retailer. The warranty does
not cover damage caused by improper installation or maltreatment - replacement or repair in
such cases can only be carried out at the owner’s expense.
Audio AG does not accept claims for damages of any kind, especially consequential damage.
Liability is limited to the value of the ADI-8 QS. The general terms of business drawn up by Au-
dio AG apply at all times.
7. Appendix
RME news and further information can be found on our website:
http://www.rme-audio.com
Distributor: Audio AG, Am Pfanderling 60, D-85778 Haimhausen, Tel.: [phone] / 91810
Manufacturer:
IMM Elektronik GmbH, Leipziger Strasse 32, D-09648 Mittweida
Trademarks
All trademarks and registered trademarks belong to their respective owners. RME, Hammerfall
and DIGICheck are registered trademarks of RME Intelligent Audio Solutions. SyncAlign, To-
talGain, SyncCheck, ZLM, SteadyClock, ADI-8 QS, I64 Option Slot, I64 MADI Card and Intelli-
gent Clock Control (ICC) are trademarks of RME Intelligent Audio Solutions. Alesis and ADAT
are registered trademarks of Alesis Corp. ADAT optical is a trademark of Alesis Corp. S/MUX is
copyright Sonorus. Digidesign and Pro Tools are trademarks or registered trademarks of Avid
Technology, Inc.
Copyright ©Matthias Carstens, 10/2010. Version 1.2
All entries in this User’s Guide have been thoroughly checked, however no guarantee for cor-
rectness can be given. RME cannot be held responsible for any misleading or incorrect informa-
tion provided throughout this manual. Lending or copying any part or the complete manual or its
contents as well as the software belonging to it is only possible with the written permission from
RME. RME reserves the right to change specifications at any time without notice.

12 User’s Guide ADI-8 QS © RME
CE / FCC Compliance
CE
This device has been tested and found to comply with the limits of the European Council Direc-
tive on the approximation of the laws of the member states relating to electromagnetic compati-
bility according to RL89/336/EWG and RL73/23/EWG.
FCC
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protec-
tion against harmful interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own ex-
pense.
RoHS
This product has been soldered lead-free and fulfills the requirements of the RoHS directive.
ISO 9001
This product has been manufactured under ISO 9001 quality management. The manufacturer,
IMM Elektronik GmbH, is also certified for ISO 14001 (Environment) and ISO 13485 (medical
devices).
Note on Disposal
According to the guide line RL2002/96/EG (WEEE – Directive on Waste
Electrical and Electronic Equipment), valid for all european countries, this
product has to be recycled at the end of its lifetime.
In case a disposal of electronic waste is not possible, the recycling can
also be done by IMM Elektronik GmbH, the manufacturer of the ADI-8 QS.
For this the device has to be sent free to the door to:
IMM Elektronik GmbH
Leipziger Straße 32
D-09648 Mittweida
Germany
Shipments not prepaid will be rejected and returned on the original sender's costs.

User’s Guide ADI-8 QS © RME 13
User’s Guide
ADI-8 QS
Usage and Operation

14 User’s Guide ADI-8 QS © RME
8. Front Panel Controls
8.1 Input
In the INPUT area, the select key causes a change of the analog input
sensitivity, referenced to digital full scale level (0 dBFS) of the AD-
converters. The choices are: +4.2 dBu (-10 dBV compatible), +13 dBu,
+19 dBu and +24 dBu. As the adaptation is performed in the analog do-
main, the ADI-8 QS achieves the highest possible values for Signal to
Noise ratio and distortion in any setting.
After selecting DIG, the digital input signal is routed to the digital outputs, with the AD-
conversion being deactivated. The level meters now show the level of the digital input signal.
8.2 Limiter
The LIMITER is available as analog function (MODE ANA), digital function (MODE DIG), or
combined (both LEDs lit).
Analog Limiter
For the ADI-8 QS, RME developed a new fully symmetrical circuit design with
digitally controlled release time. While the analog limiter is constantly within
the signal path, it operates fully transparent as long as there is no control sig-
nal generated, so does not cause noise or distortion. This special feature
made it possible to define a threshold of +3 dB in deactivated mode, prevent-
ing an overload of more than 3 dB of the AD-converters. This avoids not only
extreme overload effects, but also prevents the AD-converters from being
damaged.
Both the fully symmetrical design and the digitally controlled release time contribute to the re-
duction of the unavoidable distortion of a peak limiter (linearity errors of the control elements,
generation of the control voltage). The distortion value of about 0.3% stays the same at any
level and any frequency.
Another exceptional feature is the ability to handle extremely high levels. At the level references
+24 dBu, +19 dBu and +13 dBu up to +30 dBu can be fed, the signal is still limited correctly (-3
dBFS), THD is still 0.3%. At the setting +4.2 dBu the maximum unclipped input level is +24 dBu.
So there is more than 20 dB overload possible!
Note: As with all such basic designs, increasing dynamic ratio and gain reduction causes audi-
ble pumping effects.
Digital Limiter
The digital limiter is a non linear compressor. The input signal is processed with a special ampli-
tude function. The resulting third order harmonics are widely masked by the original signal.
The digital limiter allows for additional headroom of up to 5 dB without audible clipping (clipping:
brickwall limiting leading to high distortion). It also allows for an increase of the loudness without
increasing the maximum peak level, similar to the effect known as Maximizer. Unlike the analog
limiter there is no attack and release time and therefore no pumping effects.
The strength of the limiter effect can be adjusted in the Setup menu in steps of 1.5, 3, 4 and 5
dB, indicating the maximum level or loudness gain (chapter 9.14).

User’s Guide ADI-8 QS © RME 15
8.3 Input State
The 8 level meter of the INPUT STATE show the digital value (dBFS) of the input level per
channel. The level data incorporate Input Trim and Digital Limiter. The red LED OVR is lit 0.2
dB before full scale level (-0.2 dBFS).
With activated METER GR AUTO the amount of Gain Reduction is shown in dB as bar from top
to bottom, as soon as the Limiter becomes active. In case of overload a display is even per-
formed when the Limiter has not been activated, because the Limiter is indeed always active,
operating at a threshold of +3 dB.
When the Setup menu is active, the according parameter values are displayed in this level me-
ter window.
8.4 Meter
METER PH provides a Peak Hold function for all level meters, either
permanently (ON) or switched off by Auto Reset (AR) after 3 seconds.
In mode ON, a reset (erasing the current peak values) is issued by a
single push of the PH button. The function itself is not changed.
8.5 Remote
REMOTE defines the source of MIDI remote control commands. Choices are
the MIDI DIN jack, AES1 and the MADI input of the I64 MADI Card (Option Slot).
Note: Via MIDI remote control, all front panel controls can be locked (Lock
Keys). An exception is the REMOTE key. In the Off state (no LED lit) Lock Keys
is deactivated. Therefore a locking of all the controls can be revoked directly at
the unit at any time.
8.6 Clock Section
The source and frequency of the unit's clock is configured in the CLOCK SECTION. The button
CLOCK lets you step through the options external clock (Word, AES, Option = MADI) and inter-
nal clock, and sets the sample rate for both an external and the internal clock.
WCK, AES, OPTN (Slave Mode)
Defines the corresponding input as clock reference. A missing or invalid clock source signal is
indicated by flashing of the corresponding LED.
INT (Master Mode)
Activates the internal clock.
With a setting of INT (internal clock) it is mandatory that the clock rate of the sources is
synchronous to the ADI-8 QS. Therefore the external device has to be synchronized to the
ADI-8 QS word clock output or AES/ADAT/MADI output.
The ADI-8 QS thus has to be master, all devices connected to it must be slave. In order to avoid
clicks and drop outs due to faulty or missing synchronicity, a special process called SyncCheck
compares the incoming data and the ADI-8 QS internal clock. The SYNC state is indicated by a
flashing (error) or turned off (OK) LED.

16 User’s Guide ADI-8 QS © RME
44.1, 48
Activates the internal clock at 44.1 kHz or 48 kHz.
DS, QS
With the DS LED additionally lit, the sample rate will be 88.2 or 96 kHz, with QS lit it will be
176.4 or 192 kHz.
A selection of DS and QS is also possible when using
external clock (Slave). If the ADI-8 QS should operate
at 192 kHz, but receives a synchronous word clock of
48 kHz, the button STATE allows to activate DS or QS
mode. This way, AD-conversion and digital outputs are
configured to operate in the frequency ranges Single
Speed, Double Speed or Quad Speed.
Single Speed
All outputs carry a signal in the range of 32 kHz up to 48 kHz.
DS (Double Speed)
The AES outputs 1-8 carry a signal in the range of 64 kHz up to 96 kHz. ADAT and MADI stay
at no higher than 48 kHz, with the data transmitted in the S/MUX format.
QS (Quad Speed)
The AES outputs 1-8 carry a signal in the range of 176.4 kHz up to 192 kHz. ADAT and MADI
stay at no higher than 48 kHz, with the data transmitted in the S/MUX4 format. Therefore ADAT
is limited to 4 channels (2 per optical output) in this mode.
8.7 Digital Input
The key DIGITAL INPUT defines the signal source of the DA-
converters. This is also true for the mode Digital to Digital, where the
chosen digital input signal is sent directly to the digital outputs.
Each input has its own SYNC LED. If a valid input signal is applied,
SyncCheck is active automatically. SyncCheck takes the chosen clock
(internal, external, etc.) as reference and compares it with the input
clocks. Inputs which are not synchronous will be signalled by flashing of
the corresponding SYNC LED.
8.8 Output State
The 8 level meter of the OUTPUT STATE show the digital input level per channel as digital
value (dBFS). The display incorporates the settings of Global Output Level and Output Trim.
Therefore overloads of the DA-converters will always be displayed.
When the Setup menu is active, all available options are displayed in this level meter window.
8.9 Set (Rotary Encoder)
The rotary encoder is a highly intuitive multifunctional device. It is used to set
the trim values, the volume, and various options in the Setup menu.
Pushing the knob SET activates the Setup menu. Within the Setup menu a
push on SET changes between left and right window.

User’s Guide ADI-8 QS © RME 17
8.10 Output
In the OUTPUT area, the select key causes a change of the analog output
level, referenced to digital full scale level (0 dBFS) of the DA-converters.
The choices are: +4.2 dBu (-10 dBV compatible), +13 dBu, +19 dBu and
+24 dBu. As the adaptation is performed in the analog domain, the ADI-8
QS achieves the highest possible values for Signal to Noise ratio and dis-
tortion ratio in any setting.
9. The Setup Menu
Some options and settings are seldom accessed and changed. These have been collected in
the Setup menu. The Setup menu is entered by pushing the rotary encoder (SET) in both level
meter windows. The right window shows all the options, the left window is used to configure
them. In the currently active window all red LEDs are lit, similar to a cursor function.
The setup procedure is run as follows:
•Push SET 1 time. The level display vanishes, the cursor marks the right window.
•Turn SET left or right until the desired option shows up, for example Digital to Digital, shown
as the letters d d.
•Push SET 1 time. The cursor jumps to the left window.
•Turn SET left or right until the desired parameter value shows up. In this example, d d can
be activated (check symbol) or deactivated (no check symbol).
•Push SET 1 time to return to the options in the right window, or simply wait for 6 seconds.
The last setting stays valid, the setup menu is left, and the level meters work again.
9.1 Exit
The Setup menu is exit automatically when no entries are received for
about 6 seconds. A quicker is to use the option Exit. Selecting the
arrow in the left window will exit the Setup menu immediately. All set-
tings performed before are stored and stay valid.
9.2 Global Output Level
Ganged setting of all 8 analog output levels simultaneously. This
function provides a global volume control, which is indispensable
when doing surround monitoring. The included remote control box
directly uses this function.
The level attenuation is calculated and performed in the digital domain. When using higher at-
tenuation settings most of the time, the hardware output level (OUTPUT) should be changed to
a lower setting to utilize the whole dynamic range of the DA-converters as much as possible.
There are 48 steps from 0 dB (no attenuation) down to -96 dB available. Each step is shown as
one LED in the left window. The more LEDs light up, the higher is the output level. At 0 dB at-
tenuation all 48 LEDs are lit. In the range of 0 db down to –20 dB the attenuation takes place in
steps of 1 dB.

18 User’s Guide ADI-8 QS © RME
When all LEDs of a column are turned off, the corresponding attenuation is:
Channel 8 -6 dB Channel 5 -28 dB Channel 2 -78 dB
Channel 7 -12 dB Channel 4 -40 dB No LED Mute
Channel 6 -18 dB Channel 3 -54 dB
When changing the Global Output Level the individual settings of Output Trim are maintained.
So the gain of all channels can be increased or decreased without them loosing their level rela-
tions.
9.3 Input Trim
Default: 0 dB
Available settings: 0 up to +6 dB in steps of 0.5 dB
Additionally to the four hardware-based reference levels a digital amplification of up to +6 dB
can be applied to any input channel. This allows for an individual and separate level calibration
of the AD-conversion. At the same time the ADI-8 QS is provided with a near stepless input
sensitivity from +7 dBu up to +24 dBu, adjustable in steps of 0.5 dB.
Naturally the digital amplification reduces the signal to noise ratio according to the current gain.
At +6 dB the maximum SNR of 114 dB is reduced to 108 dB.
9.4 Output Trim
Default: 0 dB
Available settings: -6 dB up to +6 dB, in steps of 0.5 dB
Additionally to the four hardware-based reference levels a digital gain change of +/- 6 dB can be
applied to any output channel. This allows for an individual and separate level calibration of the
DA-converter outputs, as required in a surround monitoring setup.
With a full scale signal (0 dBFS) positive values cause an overload of the DA-converter, but this
is clearly shown on the output level meter. Using the ADI-8 QS as converter for surround moni-
toring, overloads are usually no issue. The typical operation range of the volume control is
about -6 and -12 dB. With this there is enough headroom available for an amplification of up to
6 dB.
9.5 ID (Id)
Default: 1
Available settings: 1, 2, 3, 4, 5, 6, 7, 8
To remote control more than one ADI-8 QS each device can have its own ID, providing a sepa-
rated remote control of multiple devices via a single MIDI channel.
I64 MADI Card: The ID defines the 8-channel group within the MADI signal that is used to insert
the device's audio data:
ID 1: channels 1-8 ID 4: channels 25-32 ID 7: channels 49-56
ID 2: channels 9-16 ID 5: channels 33-40 ID 8: channels 57-64
ID 3: channels 17-24 ID 6: channels 41-48

User’s Guide ADI-8 QS © RME 19
When several ADI-8 QS, Micstasy or ADI-642 are connected via MADI, Auto ID normally takes
care of the channel assignment (see chapter 9.7, Auto ID). In special cases, it may be desirable
to set the ID manually, e.g. if the first device in a MADI chain does not support the Auto ID
mode, or if a group of eight channels needs to be routed or processed in a particular way.
With activated mode Digital to Digital ID also defines which MADI channels are sent to the
ADAT/AES outputs, see chapter 9.15.
When the ADI-8 QS is in mode Auto ID Slave, the automatically given ID is displayed by a sin-
gle red LED lit, replacing the cursor display (all red LEDs lit). A manual setting of the ID is still
possible, but is not active during slave mode.
9.6 Bank (bA)
Default: 1
Available settings: 1, 2, 3, 4, 5, 6, 7, 8
To remote control more than one ADI-8 QS each device can have its own ID, providing a sepa-
rated remote control of multiple devices via a single MIDI channel (chapter 9.5). Additionally But
there are not only 8 IDs, but 8 banks of 8 IDs each available.
9.7 Auto ID (Au)
Default: Off
Available settings: On, Off
This option relates to the use of the I64 MADI Card. Multiple ADI-8
QS (and Micstasy and ADI-642, see chapter 12.3) connected serially
can assign consecutive IDs to themselves (see chapter 9.5). At the
first device in the chain Auto ID is set to On (see picture to the left), all
other devices automatically turn into slaves.
9.8 Delay Compensation (dC)
Default: Off
Available settings: On, Off
This option relates to the use of the I64 MADI Card. When multiple devices are connected seri-
ally, the MADI I/O of each ADI-8 QS causes a delay of 3 samples. Therefore at the MADI output
of the last device, the data of all previous devices are delayed. At Double Speed the delay rises
to 6 samples per unit, at Quad Speed to 12 samples.
The problem of this offset is solved by the function Delay Compensation. It delays the signals in
a way that they are sample-synchronous in multi-device operation.
Attention: Delay Compensation has to be activated manually in each unit!
The following table lists the delay in samples from two up to eight units connected serially.
When using four units, the data of the first unit are delayed by 9 samples to the last unit, the
units 2 and 3 are delayed by 6 and 3 samples respectively. At Double Speed and Quad Speed
the values rise. Please note that in Double Speed no more than four, in Quad Speed no more
than two ADI-8 QS can be used serially with MADI.

20 User’s Guide ADI-8 QS © RME
Units Delay Delay DS Delay QS DC DC DS DC QS
2 3 6 12 21 18 12
3 6 12 - 21 18 -
4 9 18 - 21 18 -
5 12 - - 21 - -
6 15 - - 21 - -
7 18 - - 21 - -
8 21 - - 21 - -
As shown in the table, activating DC causes a constant delay of 21 samples in Single Speed,
no matter how many devices are connected serially. In Double Speed the delay is 18, in Quad
Speed 12 samples. The in most cases slightly increased delay is outweighed by the big advan-
tage of sample-aligned I/Os when using multiple units.
Delay Compensation always uses the worst case, the operation of 8 units, but delays the sig-
nals individually. The amount of the respective delay is solely derived from the current ID, no
matter if it has been assigned manually or by Auto ID.
9.9 Follow Clock (FC)
Default: Off
Available settings: On, Off
The signal at the word clock or AES input can be Single, Double or Quad Speed, the ADI-8 QS
can use it in any case, independent of its current clock range. When activating the option Follow
Clock the ADI-8 QS follows the input clock 1:1. At 96 kHz the DS LED will light up automatically,
at 192 kHz the QS LED. This function is automatically deactivated for the I64 MADI Card and
the ADAT input, as it is not possible to detect the sample rate range automatically.
9.10 Word Clock Out (Co)
Default: FS
Available settings: Si, FS
Si stands for Always Single Speed, FS for the current sample rate or Follow Sample rate. In
default state (FS) the word clock output follows the current sample rate up to 192 kHz. Selecting
Si causes the word clock output to always stay within the range of 32 kHz to 48 kHz. So at 96
kHz and 192 kHz sample rate, the output word clock is 48 kHz.
Note: A reliable sample-accurate synchronicity between multiple devices having digital inter-
faces in S/MUX technology (ADAT and MADI*) at sample rates in the Double Speed and Quad
Speed range is only possible when all units are synced by Single Speed word clock. Because of
the S/MUX method the device else can not know which of the incoming 2 (DS) or 4 (QS) word
clock edges is the right one.
* With the ADI-8 QS this limitation is also valid for the AES output, as the device internally handles all the data streams
in S/MUX mode.
21 samples @ 48 kHz
equal 437 µs.
18 samples @ 96 kHz
equal 187 µs.
12 samples @ 192
kHz equal 62.5 µs.