Monitor Controller Owners Manual

2
1 Welcome
Welcome and thanks for purchasing the Grace Design m905 reference monitor controller. We build all
of our products to be completely reliable and straightforward to use, so you can concentrate on doing
great work. While you will nd the m905 is fairly straightforward to use, it is a very powerful unit and a
great deal of user conguration is possible, so we recommend that you spend some time reading this
manual to help avoid any common user diculties.
In the event that you do encounter any technical diculties with this or any of our products, feel free to
call us at 303-823-8100. Our oce hours are 9:00 to 5:00, Monday through Friday, MST, or you may e-
mail any technical questions to: [e-mail]. Also, please check out our website for complete
product information, owner’s manuals and technical documents http://www.gracedesign.com
Grace Design has been building audiophile quality products for the recording industry for over 20 years.
The technology in the m905 is the result of extensive research, listening, testing and careful renement.
Your m905 represents a combination of absolutely pristine audio performance, robust mechanical
construction and complete reliability. We sincerely hope it helps you achieve a new level of excellence
in your work!
Contents
1 WELCOME 2
2 IMPORTANT SAFETY INFORMATION 3
3 SAFETY MARKING SYMBOLS 3
4 SERVICE INFORMATION 3
5 M905 FEATURES 4
m905 Audio Control Unit Rear Panel 5
Audio Control Unit Front Panel 6
Remote Control Unit (RCU) 6
m905 Graphical User Interface 7
7 UNPACKING AND INSTALLING 8
Your m905 Box Will Contain 8
Open and Inspect the Box 8
Register Your Unit 8
8 CONNECTING THE M905 8
Power Connections 8
Power-Up Sequence 8
System Connections 9
9 NORMAL OPERATION MODE 11
Input Selection 11
Volume Control, Preset & Headphone Mute 11
Speaker Output Selection 12
Monitoring Option Controls 12
Display 14
Save / Recall of User Configuration 15
Optional IR (infrared) Remote Control Operation 15
Analog Only Option 17
10 SETUP MODE 17
Entering and Exiting Setup Mode 17
Input Setup 18
Speaker Setup 20
Dim Setup 21
SUB / DAC / METER setup 21
CUE Output Setup 22
Headphone Setup 23
Talkback Setup 24
Mute / (solo) 24
11 GENERAL SETUP 25
Display Setup 25
IR (infrared) Remote Setup 25
DIGI LOOP Setup 26
Digital Input Setup 26
System Setup 27
SPL Meter Setup 27
12 ABOUT CROSS-FEED 28
13 COMMUNICATION ERROR HANDLING 29
14 COMPUTER AUDIO SETUP 29
Asynchronous USB Audio 29
USB Up Channel Setup 30
Computer Audio Requirements 31
Using the m905 for DAW playback 32
15 UPDATING FIRMWARE 32
Updating RCU Firmware 33
Updating ACU Firmware 34
Updating XMOS Firmware 35
16 SPECIFICATIONS 37
17 BLOCK DIAGRAM 39
18 PCB JUMPER LOCATIONS 40
19 WIRING DIAGRAMS 41
20 CLEANING AND MAINTENANCE 42
21 WARRANTY INFORMATION 42
22 MANUAL REVISIONS 43