Grace m908 Manuale utente
m908 Preliminary User Manual, Rev. 04
m908 multi channel monitor controller
PRELIMINARY
Entries marked ** are still to be defined.
Owner's Manual – Revision 01 / Feb 2019
RCU Firmware version: 0.01
ACU Firmware version: 0.01*
race Design, Lyons, CO / 1.303.823.8100
www.gracedesign.com / [email protected]
Page 1 of 108 Table Of Contents
m908 Preliminary User Manual, Rev. 04
Table of Contents
1 Welcome...................................................................4
2 Important Safety Information...................................4
2.1 eneral...................................................................4
2.2 Safety Marking Symbols.......................................4
2.3 Service Information...............................................4
2.4 California Proposition 65 Warning........................5
3 Overview And Features............................................5
3.1 Features..................................................................5
3.2 ACU Description...................................................6
3.3 ACU Front Panel Connections and Controls........8
3.4 ACU Rear Panel Connections...............................8
3.5 RCU Description.................................................11
3.6 RCU Front Panel Controls...................................11
3.7 RCU Rear Panel Connections.............................13
3.8 RCU Tilting Base................................................13
3.9 PSU Description..................................................14
3.10 PSU Front Panel Controls and Indicators.........14
3.11 PSU Rear Panel Connections............................14
4 Installation..............................................................15
4.1 Unboxing your m908...........................................15
4.1.1 Open and inspect your box.........................15
4.1.2 Your box will contain..................................15
4.1.3 RE ISTER YOUR UNIT...........................16
4.2 Connecting the m908...........................................16
4.2.1 Power Connections.....................................16
4.2.2 Audio Connections......................................16
4.2.3 Optional ADC Module Connections...........17
4.2.4 Clock and Control Connections..................17
4.2.5 Thermal Management.................................18
5 Operation................................................................19
5.1 Manual conventions.............................................19
5.2 Home Screen........................................................20
5.2.1 1 Input Selection.........................................20
5.2.2 2 Control Room Speakers Layout Icons.....20
5.2.3 3 Control Room Speaker Output................21
5.2.4 4 Control Room Monitor Level..................21
5.2.5 5 Headphone Crossfeed..............................21
5.2.6 6 Headphone Monitor Level.......................21
5.2.7 7 SPL Meter................................................21
5.2.8 8 Clock Source and Status..........................22
5.2.9 9 System Sample Rate.................................22
5.3 INPUT SELECT..................................................22
5.3.1 Input Summing Mode.................................23
5.4 DIM......................................................................23
5.5 X-FEED...............................................................23
5.6 MONO / (L-R).....................................................25
5.7 MON>CUE..........................................................25
5.8 MUTE..................................................................26
5.9 CR1, CR2, CR3...................................................26
5.10 BASS MANA EMENT...................................26
5.11 ROOM CORRECTION.....................................27
5.12 TALKBACK......................................................28
5.13 SOLO/MUTE....................................................31
5.14 VOLUME (push for phones).............................32
5.15 A B C User Switches.........................................33
5.16 Monitor Snapshots.............................................33
5.17 Meter Outputs....................................................34
5.18 **Downmix.......................................................35
5.19 Clocking.............................................................36
5.20 Word Clock In and Out......................................37
5.21 Error Messages..................................................38
5.21.1 ACU Over Temperature............................38
5.21.2 PSU Error..................................................39
5.21.3 Communication Error...............................39
5.21.4 Cooling Fan Error.....................................40
6 System Setup..........................................................40
6.1 Introduction.........................................................40
6.2 Workflow Setup...................................................42
6.2.1 Workflow Setup Main Screen.....................42
6.2.2 Select Workflow To Edit Screen.................43
6.2.3 Editing Workflow Screen............................44
6.2.4 Workflow Channel Setup Screen................45
6.2.5 Editing Workflow Rename Screen..............46
6.2.6 Editing Workflow Save and Exit................47
6.2.7 Editing Workflow Cancel............................48
6.2.8 Workflow Load...........................................49
6.2.9 Workflow Copy...........................................50
6.2.10 Workflow New..........................................51
6.2.11 Workflow Import From USB....................52
6.2.12 Workflow export to USB..........................54
6.2.13 Workflow delete........................................57
6.3 Setup....................................................................58
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m908 Preliminary User Manual, Rev. 04
6.3.1 Navigating and Using the Setup Menus.....58
6.3.2 Standard Parameter Editing........................60
6.3.3 Standard Name Editing...............................61
6.3.4 Standard Channel Routing..........................63
6.3.5 Input Setup..................................................65
6.3.6 Dim setup....................................................67
6.3.7 CR1, CR2, CR3 Speaker setup...................68
6.3.8 Bass Management setup..............................71
6.3.9 **SOLO/MUTE Setup................................71
6.3.10 Room Correction setup.............................73
6.3.11 Monitor Control setup...............................74
6.3.12 MONO setup.............................................76
6.3.13 (L-R) setup................................................76
6.3.14 CUE setup.................................................77
6.3.15 MUTE setup..............................................79
6.3.16 User A B C Switches Setup.......................80
6.3.17 Downmix setup.........................................81
6.3.18 Monitor Snapshot setup............................81
6.3.19 Meter Output setup....................................82
6.3.20 Talkback setup...........................................84
6.3.21 SPL Meter setup........................................86
6.3.22 Clock Source Setup...................................87
6.3.23 Word Clock Termination Setup.................88
6.3.24 Word Clock Output Setup.........................88
6.3.25 * PIO Setup.............................................88
6.3.26 System Setup.............................................91
7 Option Modules......................................................93
7.1 ADC Option Module...........................................93
7.2 Dante Option Module..........................................94
7.3 DigiLink Option Module.....................................94
7.4 Phono Preamp Option Module............................95
8 USB Audio Setup...................................................96
8.1 Computer Audio Requirements...........................96
8.2 Windows USB ASIO Driver................................97
8.2.1 Installing USB ADIO Driver......................97
8.2.2 Using The USB ASIO Driver.....................99
9 **Firmware Upgrades..........................................101
9.1.1 Firmware Update Procedure.....................102
10 Electrical Specifications.....................................102
11 Block Diagrams..................................................102
12 Cable and Connector Diagrams..........................103
13 Dimensions.........................................................106
14 Warranty Information.........................................107
15 Illustrations Index...............................................108
16 Manual Revision History....................................109
List of Tables
Clock Status...............................................................36
Speaker Names...........................................................42
Workflow Templates..................................................48
PIO FUNCTIONS...................................................79
PIO VOLTA E CONFI URATION.......................81
Dante Channel Count.................................................85
DB25 Digital AES3 (Tascam Pinout).........................92
DB25 Analog (Tascam Pinout)...................................92
DB15 RCU Connector................................................93
Manual Revision History............................................98
Page 3 of 108 Table Of Contents
m908 Preliminary User Manual, Rev. 04
1 Welcome
Thanks for purchasing the m908 multi-channel monitor controller. It has been painstakingly
designed and built to provide you with a beautiful sounding, configurable and reliable monitoring
system. Please familiarize yourself with the setup and operational details contained in this
manual. And as always with this or any other race Design products, please don't hesitate to
reach out if you have any questions. We are available by telephone Monday – Friday, 9AM to
5PM MST, or by email at [email protected]. Also, other information including technical
documents and firmware can always be found on our website – www.gracedesign.com. Thanks
for reading and enjoy your m908!
2 Important Safety Information
2.1 General
•Indoor use only
•Ordinary Protection: This equipment should not be exposed to dripping or splashing.
•Avoid placing objects filled with liquids, such as vases or glasses, on this equipment.
•Class I Equipment (grounded type)
•Electrical rating: 90-240V~ 50-60Hz 40W
•Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage.
•Pollution Degree 2
•Installation (Over voltage) 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
2.2 Safety Marking Symbols
This symbol, located on the equipment and in this manual, refers to important instructions.
Read this manual thoroughly before operating this equipment.
This symbol, located on the equipment and in this manual, indicates the potential for
electrical shock hazard.
2.3 Service Information
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m908 Preliminary User Manual, Rev. 04
The race Design m908 contains no user serviceable components. Contact race Design for
repair and upgrade information. In the event that your race Design m908 needs to be returned to
the factory, contact us for a return authorization number.
2.4 California Proposition 6 Warning
This product may contain metallic nickel, a chemical known to the State of California to cause
cancer and birth defects or other reproductive harm. Wash hands after handling.
3 Overview And Feature
3.1 Features
•24 Channel DSP for immersive surround formats such as ATMOS™, DTS:X™ and Auro 3D™
•Manage playback systems from mono through 22.2
•Our latest generation of AD and DA converters
•Powerful and ergonomic remote control unit for access to all system controls
•4th generation s-Lock pll clocking system for vanishingly low jitter
•High resolution volume control
•Up to 1 second sync delay
•Room correction EQ
•Full bass management
•Speaker channel level and delay calibration
•Comprehensive downmix control
•16 channel analog out / 24 channel AES3 digital I/O
•16 channel ADAT Lightpipe In / USB 24 channel In
•AES3, S/PDIF, and TOSLINK Stereo In
•Optional Dante™, DigiLink™ or MADI module for additional 32 channel I/O
•Optional 8 channel ADC module for 8 or 16 channel analog inputs
•Optional high performance RIAA phono preamplifier for MC and MM cartridges.
•Flexible Meter outputs
•Built in SPL meter
•Dual redundant external power supply
•Reference quality headphone amplifier with cross-feed.
•Flexible talkback system with built-in mic on remote control and mic input for external talkback
mics
•Up to 8 stereo CUE paths
•4 eneral Purpose Input and Output pins for interfacing to external systems.
Page 5 of 108 Table Of Contents
m908 Preliminary User Manual, Rev. 04
The m908 consists of three components: ACU (Audio Control Unit), RCU (Remote Control Unit), and
PSU (Power Supply Unit) Below is a description of the connections, controls, and indicators for each
component.
3.2 ACU Description
The 2U ACU chassis houses all of the analog and digital audio IO, DSP processing, and
control IO. The audio signal processor is a 1 Hz 32 bit floating point unit which allows for
highly accurate and low latency signal processing. 2 B of DDR2 ram allows for ample sync
delay across 24 channels at sample rates up to 192kHz. Audio routing, AES and ADAT encoding
and decoding is handled by an Artix-7 FP A. The system is managed by an ARM Cortex-A15
processor running embedded Linux.
The m908 system clock is based on our 4th generation s-Lock PLL technology. This is an
incredibly low jitter PLL that provides exceptional ADC and DAC sample clocking accuracy.
The Audio and Clock flow is shown in the simplified block diagram below.
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m908 Preliminary User Manual, Rev. 04
The audio signal processing signal flow is shown in the diagram below.
Page 7 of 108 Table Of Contents
AUDIO INPUTS ROUTING
DSP
ADC OPTION
ANALOG 16CH
ANALOG 2CH
AUDIO OUTPUTS
DAC
ANALOG 16CH
HP AMP
RCU
DIGITAL OUTPUTS
AES DIGITAL 24CH
USB 8CH
DANTE 32CH
CLOCK
s-Lock PLL
WORD CLOCK I O
IN OUT
ACU TALKBACK
RCU TALKBACK
DIGITAL INPUTS
AES DIGITAL 24CH
USB 24CH ADAT 16CH
(TOSLINK 2CH)
DANTE 32CH
SPDF 2CH
AES 2CH
TALKBACK OUT
Illustration 1: Audio and Clock low Diagram
m908 Preliminary User Manual, Rev. 04
3.3 ACU Front Panel Connections and Controls
1. 1/4" Headphone Jack: The m908 headphone amplifier is an ultra high performance current
feedback design. Very low output impedance ensures good damping factor at the headphone
driver. The proprietary crossfeed circuit provides natural imaging and minimizes listening
fatigue.
2. Power indicator LED: reen LED illuminates solid green under normal conditions. Flashing
indicates a fault contrition in the redundant power supply unit.
3.4 ACU Rear Panel Connections
Page 8 of 108 Table Of Contents
AUDIO
INPUTS
SYNC
DELAY
LEVEL
OFFSET
BASS
MANAGEMENT
SPEAKER
DELAY
INPUT SELECT
AND SUMMING
AUDIO
OUTPUTS
SPEAKER
VOLUME
SPEAKER
LEVEL
OFFSET
Illustration 2: audio path flow diagram
1 2
Illustration 3: ACU ront Panel
m908 Preliminary User Manual, Rev. 04
1. DC power input connector 8 Pin Circular: Connect to PSU. CAUTION: CONNECT PSU TO
ACU WITH DC POWER CABLE BEFORE APPLYIN POWER.
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5 6 7 8 9
20 21 22
1 2
10 11
3 4
12 13 14 15 16 17 18 19
TB INTB OUT
(1- 8)
BAL IN
UNBAL IN
R
L
L L
ADC 1
R CR 3 OUT R
MADE IN LYONS, CO USA
CUE/CR EXT.
CR 1 OUT CR 2 OUT
(1- 8) (9 - 16)
14
1
14
1
14
1
m908 RCU
AES3
1 IN/OUT
DC IN
A140-M908
ETHERNET AES3 IN S/PDI OPTICAL IN AUDIO WC IN
WC OUT
OPTION I/O
AES3 3 IN/OUT
AES3 2 IN/OUT
HOST
TALKBACK SWITCH
ADC 2
m908 RE ERENCE MONITOR CONTROLLER
PSU ONLY
12
A908
ANALOG IN 1-8
ADC
A908
ANALOG IN 1-8
ADC
14
1
14
1
1
4
1
9
1
14
1
14
1
86
5
2
1
3
Illustration 4: ACU Rear Panel
m908 Preliminary User Manual, Rev. 04
2. AES3 I/O x 3 DB25 (Tascam pinout) 110Ω: 24 channel input and output. Accepts sample rates
from 44.1kHz-192kHz.
3. Option I/O slot (Dante , Digilink, and MADI options): The Option I/O module can receive and
transmit 24 channels of PCM audio.
4. Analog balanced input ADC (optional): There are slots for two optional 8 channel ADC
modules with DB25 input connectors. The ADC modules plug in to the main digital pcb. Two
ADC modules can be used for a total of 16 channels. The ADC in position 1 is also connected
to the stereo balanced XLR and unbalanced phono jacks so that it can be used for monitoring
stereo sources on channels 1-2. Note that when monitoring the stereo connections, channels 1-2
on the DB25 connector are not heard.
5. Stereo Input analog unbalanced RCA Phono: Present if an ADC option module is installed. Can
be switched to Phono level if the RIAA Phonograph Preamplifier module is installed.
6. Stereo Input balanced analog XLR: Present if an ADC option module is installed.
7. Control Room 3 Output balanced analog XLR: Analog output signals sourced from DAC
channels 1-2.
8. Talkback output balanced analog XLR: Talback signal sourced from ACU or RCU Mic. Can be
configured to be momentary while talkback is active or continuously on.
9. Talkback mic input balanced XLR: Balanced microphone level input with available 48V
phantom power. The talkback signal is fed to an ADC and sent to the DSP section and also sent
to the Talkback output XLR connector. This is a full featured high performance microphone
preamplifier that can be used for recording and voice over applications.
10. External Talkback switch jack 1/4" TRS: Wiring a normally open switch to this jack will allow
for another talkback control. The Ring of this connector carries current limited 5V for
powering a tally LED. See Cable Diagrams.
11. Ethernet Control Port RJ45: Reserved for future use.
12. RCU serial control DB15: Connect to RCU with supplied DB15 cable.
13. USB Host USB-A: USB host connector for system firmware update.
14. AES3 Input XLR: Stereo AES digital input. Supports sample rates from
15. SPDIF Input RCA Phono
16. ADAT/TOSLINK x 2 Optical: Optical receivers for ADAT or TOSLINK. Supports SMUX for
8ch 96kHz operation.
17. USB Audio I/O USB-B: The USB Audio Class 2 compliant interface allows for monitoring up
to 24 channels of PCM audio at 48kHz/24bit and 8 channels of PCM audio at 192kHz/24bit.
18. Word Clock IN BNC 75Ω or 47kΩ (setup menu selected): External clock input.
19. Word Clock OUT / THROU H BNC 75Ω: Output clock signal can be a buffered copy of the
incoming word clock or can be from the internal word clock.
Page 10 of 108 Table Of Contents
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