Grace m906 User manual

Rev B all contents © Grace Design/ Lunatec LLC
owner’s manual

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Table of Contents
Welcome 2
Important Safety Information 3
m906 mainframe frontpanel 4
m906 Key Features 4
m906 mainframe rearpanel 5
m906 remote control unit 7
Unpacking and Installing your m906 System 9
Connecting the m906 10
System Connections 12
Operating the m906 14
Advanced Features: Accessing the Cal Modes 22
Cleaning and Maintenance 27
Cable and Connector Wiring Diagrams 28
m906 Block Diagram 29
Specications 30
Warranty Information 32
Welcome
Thanks for purchasing the Grace Design m906 high delity 5.1 monitoring system. We build all our
products to be completely reliable and easy to use, so you can concentrate on producing great
sounding audio, not struggling with complicated equipment or difcult to use product manuals.
While the m906 has been designed to be straightforward to use, we do suggest that you spend a
little time familiarizing yourself with the features and operational functions that are contained in this
manual. Doing this now will likely make your experience with the m906 more enjoyable.
In the event that you encounter any technical or operational difculties with this or any Grace Design
product, please feel free to contact us at 303-443-7454. Our ofce hours are from 9 to 5, Monday
through Friday, MST. Or you can email your questions to: [email protected]om
Also, please remember to visit our website- www.gracedesign.com for the latest Grace Design
product information, owner’s manuals and technical documents.
Grace Design has been building audiophile quality products for the recording industry for over a
decade. The technology developed for the m906, and all of our products, has evolved through a
process of extensive listening, eld testing and careful renement.
Your new m906 system represents a combination of absolutely pristine audio performance, robust
mechanical construction and bombproof reliability.
Regardless of what type of work you do, your m906 will faithfully serve as an invisible link between
your source audio and your speaker systems. We sincerely hope our products help you achieve a new
level of excellence in your work! -The Grace Design Team

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Important Safety Information
General
•Indoor use only
•Ordinary Protection: This equipment should not be exposed to dripping or splashing.
•Avoid placing objects lled with liquids, such as vases or glasses, on this
equipment.
•Class I Equipment (grounded type)
•Electrical rating: 100-120/220-240V~ 50-60Hz 25W
•Mains supply voltage uctuations are not to exceed ±10% of the nominal supply
voltage.
•Pollution Degree 2
•Installation (Overvoltage) Category II for transient overvoltages.
•Maximum Relative Humidity: <80%
•Operation temperature range: 10 °C to 40 °C
•Storage and transportation temperature range –40 °C to 70 °C
•Maximum altitude: 3000m (9843 ft)
•Equipment suitable for continuous operation
•Weight: 2.6kg (5.8lbs)
Safety Marking Symbols
CAUTION: READ ACCOMPANYING DOCUMENTS
This symbol, located on the equipment and in this manual, refers to important instructions. Read
this manual thoroughly before operating this equipment.
Service Information
The Grace Design m906 contains no user serviceable components. Contact Grace Design for repair
and upgrade information. In the event that your Grace Design m906 needs to be returned to the
factory, contact us for a return authorization number.
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m906 Key Features
•Multiple 5.1 and stereo analog inputs
•24-bit/192kHz digital 5.1 and stereo inputs – AES3, S/PDIF, ADAT and TOSLINK formats
•s-Locktm PLL (Phase Lock Loop) for ultra-low jitter sample clock regeneration
•Precision main and headphone level controls with a 100dB gain range in 0.5dB steps
•All controls built into an elegant, convenient desktop remote control unit
•All I/O and audio are routed in a 2U, 19” rack mount mainframe with an external 1U, 
rack linear power supply
•Multiple speaker set selection – two surround/stereo sets and a third stereo set
•High current reference headphone amplier built in – one output on the remote
control unit and an additional output on the system mainframe
•Comprehensive system level calibration (inputs, outputs, inter-channel balance, dim)
•Individual channel solo/mute
•Balanced talkback microphone input with 48V phantom power with an activation
switch on remote and an additional external switch control jack
•Fixed level 5.1 DAC output for digital to analog transfers
•5 year limited warranty on parts and labor
m906 mainframe frontpanel
power
headphone
GRACE DESIGN USA
AB
HEADPHONE OUTPUT The mainframe headphone output is provided via a ” TRS (Tip,
Ring, Sleeve) jack. This output runs parallel with the headphone jack on the remote unit.
POWER LED The green POWER LED is illuminated when power is received from the external
power supply to the rear panel mounted DC input.
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m906 mainframe rearpanel
TB MIC
5.1 CR OUT 2
5.1 CR OUT 1
5.1 INPUT 1
LS RS Sub
DC IN
5.1 DAC OUT
5.1 INPUT 2
REMOTE TB SW
2 CH 2
L R
GRACE DESIGN USA
2 CH 1
LR
CUE IN
LR
CUE OUT
LR
CR OUT 2
LR
CR OUT 1
LR
Left RightCenter
DIGITAL INPUTS / SYNC
AES3 S/PDIF AES3 x 4TOSADAT
THRU
GRACE DESIGN AT103 906 DAC
WORD CLOCK/
SUPERCLOCK
IN
1M 75
load
1
3
PUSH
21
3
PUSH
21
3
PUSH
21
3
PUSH
21
3
PUSH
21
3
PUSH
2
1
3
PUSH
2
1
3
PUSH
2
O TSRQ
LM
G H
DJ
E I
A CF
BKN
PU
5.1 DAC OUTPUT This female DB-25 connector supplies 5.1 xed level balanced DAC output
signals, wired to the Tascam DA-88 standard pinout.
5.1 CR OUT #2 This female DB-25 connector carries the balanced analog Control Room
Output #2 signals for connection to a 5.1 speaker system, wired to the Tascam DA-88
standard pinout.
5.1 CR OUT #1 This female DB-25 connector carries the balanced analog Control Room
Output #1 signals for connection to a 5.1 speaker system, wired to the Tascam DA-88
standard pinout.
DC IN This 6-pin male XLR DC input accepts the supplied cable from the m906’s external
power supply.
WORD CLOCK/SUPER CLOCK THRU This BNC connector is used to pass an external Word
Clock or Super Clock reference signal through to another digital device down stream of the
m906.
WORD CLOCK/SUPER CLOCK IN This BNC connector allows the m906 to receive an external
Word Clock or Super Clock source to be used as a reference for locking the m906’s internal
clocks.
WORD CLOCK TERMINATION SWITCH This switch is is used to properly terminate a
connection from an external clock reference source to the m906 Word or Super Clock
input.
ADAT INPUT This Lightpipe connector provides an 8-channel input interface from an ADAT
format digital source. 44.1kHz and 48kHz sample rates are supported.
AES3 STEREO INPUT This female XLR connector is used to receive a stereo AES3 format
digital signal.
(contunued)
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