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m908 User Manual, Rev. G

the AC power cord from the m908 PSU. Remove the m908 ACU top cover using a #2 Phillips

screwdriver.

There are ESD sensitive components on the circuit boards inside the m908. Take care to insure

that your work space is free of static electricity before removing the cover of the m908 ACU.

Page 107 of 135 Table Of Contents

Main Page

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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