Name: Grace m908
Brand: Grace
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m908 User Manual, Rev. G

m908 multi channel monitor controller

user manual

Revision G / 01/27/2020

ACU Firmware version: 1.0.1

RCU Firmware version 1.0.1

Please visit https://gracedesign.com/support-documents/ for the latest m908 firmware and

documentation. See the Firmware Update Procedure section of this manual for details.

Grace Design, Lyons, CO / 1.303.823.8100

www.gracedesign.com / info@gracedesign.com

Page 1 of 135 Table Of Contents

Illustration 1: Audio and Clock Flow Diagram7
- Illustration 2: Audio Processing Flow Diagram8
- Illustration 3: ACU Front Panel8
- Illustration 4: ACU Rear Panel9
- Illustration 5: RCU Front Panel12
- Illustration 6: RCU Rear Panel13
- Illustration 7: PSU Front Panel14
- Illustration 8: PSU Rear Panel15
- Illustration 9: M908 System Load Splash Screen20
- Illustration 10: Home Screen21
- Illustration 11: Input Page Select24
- Illustration 12: Input Summing Mode24
- Illustration 13: Input Summing Error: Clocksource Mismatch25
- Illustration 14: Input Summing Error: Sample Rate Mismatch25
- Illustration 15: Input Summing Error: Sync Delay Mismatch26
- Illustration 16: Input Summing Error: ADC1 1-2 Bal- Unbal26
- Illustration 17: Direct Input Offset on Active Input27
- Illustration 18: Direct Input Offset on Inactive Input.2727
- Illustration 19: Direct Input Offset on Summed Input28
- Illustration 20: Headphone Crossfeed Flow Diagram2929
- Illustration 21: Headphone Crossfeed Response Plot30
- Illustration 22: Bass Management Flow Diagram33
- Illustration 23: Cue Input Mute Indication35
- Illustration 24: Talkback-Cue Flow Diagram36
- Illustration 25: Solo/Mute Page Keys38
- Illustration 26: Meter Output Routing40
Speaker Channels for Downmix Operation42
Center Downmix Level45
Surround Downmix Level45
- Illustration 28: Headphone Source Select46
Clock Status48
Sample Rate Status49
- Illustration 29: Word Clock Flow Diagram50
Speaker Names57
- Illustration 38: Workflow Channel Setup Screen58
- Illustration 39: Editing Workflow Rename Conflict59
- Illustration 40: Save System Workflow Changes Dialog60
- Illustration 41: Save Active System Workflow Changes Dialog60
- Illustration 42: System Configuration Updating61
- Illustration 43: Cancel System Workflow Changes Dialog61
- Illustration 44: Selected Workflow to Load Screen62
- Illustration 45: Load System Workflow Dialog62
- Workflow New63
- Illustration 46: Select Workflow to Copy Screen63
- Illustration 47: Select Template for New Workflow64
- Illustration 48: New System Workflow Confirmation64
- Click no to Return to the Select Template for New Workflow Screen64
- Workflow Import from USB65
Workflow Templates65
- Illustration 49: Select Workflow to Import from USB66
- Illustration 50: Import Workflow from USB Dialog66
- Workflow Export to USB67
- Illustration 51: Import Workflow from USB Status67
- Illustration 52: Import Workflow from USB Error Dialog67
- Illustration 53: Export Workflow to USB68
- Illustration 54: Export Workflow to USB Confirmation68
- Illustration 55: Export Workflow to USB Status69
- Illustration 56: Insert Proper USB Drive Message69
- Workflow Delete70
- Illustration 57: Export Workflow to USB Error70
- Illustration 58: Select Workflow to Delete70
- Navigating and Using the Setup Menus71
- Illustration 59: Delete Workflow Confirmation71
- Illustration 60: Cannot Delete Active Workflow71
- Illustration 61: Initial Setup Mode Dialog72
- Illustration 62: Exit Setup Without Saving Dialog72
- Standard Parameter Editing73
- Illustration 63: Edit Screen with Parameter Highlighted but Not Selected for Editing73
- Standard Name Editing74
- Illustration 64: Edit Screen with Parameter Highlighted and Selected for Editing74
- Illustration 65: Name Edit Screen74
- Illustration 66: Number Edit Screen75
- Standard Channel Routing76
- Illustration 67: Name Edit Navigation Keys76
- Illustration 68: Input Channel Setup Screen77
- Illustration 69: Speaker Channel Setup Screen78
- Illustration 70: Channel Routing Conflict Dialog78
- Input Setup79
- Illustration 71: Setup Input Screen79
- Illustration 72: Input Channel Setup Screen79
- DIM Setup81
- Illustration 73: Setup DIM Screen81
- CR1, CR2, CR3 Speaker Setup82
- Illustration 74: Setup Speaker CR Screen82
- Illustration 75: Speaker Channel Setup83
- Illustration 76: Channel Routing Conflict Dialog84
- Illustration 77: DAC 1 Output Circuit85
Control Room out Hardware Conflicts86
- Illustration 78: DAC 1: 1-2 Output Conflict86
- Bass Management Setup87
- Illustration 79: DAC 1: 3-8 Output Conflict87
- SOLO/MUTE Setup88
- Illustration 80: Bass Management Setup88
- Illustration 81: Setup SOLO/MUTE Initial Screen89
- Illustration 82: Setup Solo/Mute89
- Room Correction Setup90
- Illustration 83: Speaker EQ Parameter Screen90
- Following Parameters90
- Monitor Control Setup91
- Illustration 84: Setup Monitor Screen91
- MONO Setup93
- Illustration 85: Setup Mono Screen94
- CUE Setup95
- Illustration 86: Setup L-R Screen95
- Illustration 87: Setup Cue Outs Screen96
- Illustration 88: Setup Cue Routing Screen96
- MUTE Setup97
- User a B C Switches Setup98
- Illustration 89: Setup Mute Screen98
- Illustration 90: Setup ABC User Switch Screen98
- Downmix Setup99
- Meter Output Setup99
- Illustration 91: Meter Output Setup Screen100
- Talkback Setup101
  - Illustration 92: Setup Talkback Screen101
  - [Replace Existing Route? Dialog]101
  - Illustration 93: Setup Talkback Switch Assign Screen102
  - Illustration 94: Setup SPL Meter Screen103
  - SPL Meter Setup103
  - Clock Source Setup104
  - Illustration 95: Setup System Screen104
  - Word Clock Output Setup105
  - Word Clock Termination Setup105
- GPIO Setup105
GPIO Functions106
GPIO Voltage Configuration (Factory Default Is 5V)108
- Illustration 96: GPIO Jumper Locations108
- Illustration 97: GPIO Schematic Diagram109
- Illustration 98: Setup System Screen109
Option Modules111
- ADC Option Module111
- Illustration 99: ADC Stereo Input Routing112
- Illustration 100: ADC Input Conflict112
- Dante Option Module113
- Illustration 101: ADC Jumper Locations113
- Illustration 102: Dante Option Module113
- Digilink Option Module114
Dante Channel Count114
- Illustration 103: Digilink Option Module114
- Illustration 104: 32 Channel Digilink Connections115
- Illustration 105: 16 Channel Digilink Connections116
- Phono Preamp Option Module117
USB Audio Setup118
- Computer Audio Requirements118
- Illustration 106: RIAA Phono Module Jumper Locations118
- Windows USB ASIO Driver119
Firmware Upgrades123
- Illustration 109: USB Audio Control Panel Format.123123
Electrical Specifications126
Block Diagrams126
- Illustration 114: ACU Firmware Update Complete126
Cable and Connector Diagrams127
DB25 Digital AES3 (Tascam Pinout)127
DB25 Analog (Tascam Pinout)127
DB15 RCU and ACU Connectors129
- Illustration 115: RCU Cable Termination129
Dimensions130
- Illustration 116: Remote Talkback Switch Wiring130
- Illustration 117: Remote Talkback Switch with LED Tally130
- Illustration 118: Talkback out Unbalanced Wiring130
Illustrations Index132
Manual Revision History134

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General

Brand	Grace
Model	m908
Category	Controller
Language	English

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