Grace m908 User Manual
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Grace m908 User Manual

Multi channel monitor controller
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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*
Grace Design, Lyons, CO / 1.303.823.8100
www.gracedesign.com
/ info@gracedesign.com

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  • Page 1 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* Grace Design, Lyons, CO / 1.303.823.8100 www.gracedesign.com / info@gracedesign.com...

  • Page 2: Table Of Contents

    5.19 Clocking.............36 3.11 PSU Rear Panel Connections......14 5.20 Word Clock In and Out........37 4 Installation..............15 5.21 Error Messages..........38 4.1 Unboxing your m908...........15 5.21.1 ACU Over Temperature......38 4.1.1 Open and inspect your box......15 5.21.2 PSU Error..........39 4.1.2 Your box will contain........15 5.21.3 Communication Error.......39...
  • Page 3 6.3.1 Navigating and Using the Setup Menus..58 6.3.24 Word Clock Output Setup......88 6.3.2 Standard Parameter Editing......60 6.3.25 *GPIO Setup..........88 6.3.3 Standard Name Editing.......61 6.3.26 System Setup..........91 7 Option Modules............93 6.3.4 Standard Channel Routing......63 6.3.5 Input Setup..........65 7.1 ADC Option Module...........93 6.3.6 Dim setup............67 7.2 Dante Option Module..........94 6.3.7 CR1, CR2, CR3 Speaker setup....68...
  • Page 4 Please familiarize yourself with the setup and operational details contained in this manual. And as always with this or any other Grace 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 info@gracedesign.com.

  • Page 5: General

    The Grace Design m908 contains no user serviceable components. Contact Grace Design for repair and upgrade information. In the event that your Grace Design m908 needs to be returned to the factory, contact us for a return authorization number. This product may contain metallic nickel, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.

  • Page 6: Illustration 1: Audio And Clock Flow Diagram

    Artix-7 FPGA. 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.

  • Page 7: Illustration 2: Audio Path Flow Diagram

    ROUTING AUDIO INPUTS AUDIO OUTPUTS DIGITAL INPUTS DIGITAL OUTPUTS AES DIGITAL 24CH AES DIGITAL 24CH DANTE 32CH DANTE 32CH ADAT 16CH USB 24CH USB 8CH (TOSLINK 2CH) SPDF 2CH AES 2CH CLOCK ANALOG 16CH ADC OPTION s-Lock PLL ANALOG 16CH WORD CLOCK I/O ANALOG 2CH HP AMP...

  • Page 8: Illustration 3: Acu Front Panel

    Illustration 3: ACU Front Panel 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.
  • Page 9 ADC 2 A908 A908 m908 REFERENCE MONITOR CONTROLLER DC IN A 40-M908 PSU ONLY WC OUT OPTION I/O TALKBACK SWITCH ETHERNET m908 RCU HOST AES3 IN S/PDIF OPTICAL IN AUDIO WC IN 13 14 15 16 18 19 UNBAL IN...

  • Page 10: Features

    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.

  • Page 11: Illustration 5: Rcu Front Panel

    20. Control Room 1 output balanced analog DB25 (Tascam pinout): Analog output signals sourced from DAC channels 1-8. 21. Control Room 2 output balanced analog DB25 (Tascam pinout): Analog output signals sourced from DAC channels 1-8 22. CUE/WIDE OUT balanced analog DB25 (Tascam pinout): Analog output signals sourced from DAC channels 9-16.

  • Page 12: Illustration 6: Rcu Rear Panel

    MONO MON > CUE SETUP x-feed L - R spl clear MUTE CR 2 CR 3 SOLO/MUTE TALKBACK VOLUME push for phones Illustration 5: RCU Front Panel 1. LCD Display screen: This color LCD displays all operating parameters and setup menus. 2.

  • Page 13: Illustration 7: Psu Front Panel

    Illustration 6: RCU Rear Panel 1. m908 ACU DB15: Serial control cable connection to ACU 2. Headphone Jack 1/4" TRS: Carries stereo headphone signal from ACU headphone amplifiers. This jack is wired in parallel with ACU front panel headphone jack.

  • Page 14: Illustration 8: Psu Rear Panel

    If a DC output of power supply module #2 becomes too low or too high then the corresponding LED will flash twice repeatedly. If this happens contact Grace Design Technical Support at 303-823-8100 x105 or service@gracedesign.com...
  • Page 15 1. Fuse drawer: Contains (2) 5x20mm 800mA Time Delay fuse. 2. AC Power inlet: 90-240V~ 40W max. Connect to a grounded outlet. 3. DC Output connector: ALWAYS connect DC power cable to m908 before turning on power and turn off the power before disconnecting the DC power cable! Please take care when removing the m908 from its OEM packaging.
  • Page 16 • 1pc m908 User Manual We strongly urge you to fill out your warranty registration card. The m908 is covered by a 5 year transferable warranty. Registering your unit will help us contact you if there are important updates and simplifies warranty service. So please take a few minutes to complete and send in the enclosed card, or simply fill out the warranty registration form on our website.
  • Page 17 8 channel output to the host computer. Use a standard USB type A -to- type B cable (included with your m908). The type A connector is to be plugged in to the HOST computer and the type B connector to the m908 input. PCM 44.1kHz – 192kHz/24 bit is supported.
  • Page 18 The m908 locks to the incoming word clock with an ultra low jitter PLL. The PLL has a fast lock mode which rapidly acquires lock and then switches to a high jitter rejection mode with a loop bandwidth of 0.5Hz.

  • Page 19: Installation

    45ºC and the fan will come on. If the m908 is being used in an area where fan noise is undesirable it is recommended that the m908 be mounted such that it has space below and above the chassis and where the ambient temperature does not exceed 30ºC (86ºF).

  • Page 20: Illustration 9: Home Screen

    "push long-hold" refers to a 3 second push and hold of a switch. Illustration 9: Home Screen The home screen provides an overview of the m908 system status. The top and bottom bands of the LCD display area show the input sources available for monitoring.
  • Page 21 2. Top 3. SUB 4. Height Each icon also acts as a signal level indicator. The level is monitored post-processing and pre-volume control. • White No signal present. • Green Signal greater than -50dBFS • Yellow Signal greater than -6dBFS •...

  • Page 22: Illustration 10: Input Page Select

    (--). The m908 features a total of 16 input sources which are accessed with 8 dedicated INPUT Select switches, in 2 rows of 4, above and below the LCD display. Each INPUT Select switch is located adjacent to it's name area in the upper and lower bands of the display area.
  • Page 23 The m908 allows up to three inputs to be summed. To enter summing mode, simultaneously press the INPUT select switches for up to three of the desired inputs to sum. The inputs will become active at the same time and the name areas will turn green on the display.

  • Page 24: Illustration 11: Headphone Crossfeed Flow Diagram

    We chose the parameters of the cross-feed circuit to find a good compromise between accurate imaging and tonal neutrality.
  • Page 25 When speaker / headphone MONO is active, the switch is lit solid yellow. Press-hold of the MONO switch enters L-R mode. In this mode the m908 subtracts the right channel from the left channel and provides this signal to the monitor output.
  • Page 26 The control room speaker select switches are exclusive and only one can be selected at a time. The currently selected speaker switch will illuminate green. The m908 includes comprehensive Bass Management control. Each speaker in the Control Room system can be individually configured for crossover frequency, high pass filter slope, and low pass filter slope.

  • Page 27: Illustration 13: Bass Management Flow Diagram

    OUT 2, 3... IN 2,3... 20-150Hz HPF WORKFLOW DEPENDENT 20-150Hz LPF OUT 1 IN 1 50-150Hz HPF 6,12,18,24dB/oct WORKFLOW DEPENDENT 50-150Hz LPF 6,12,18,24dB/oct SUB MODE Σ IN LFE +10dB 80-120Hz LPF SUB OUT L Σ SUB OUT C SUB OUT R Σ...
  • Page 28 The m908 has a flexible talkback system that can be adapted to a wide range of applications. There is a microphone built in to the RCU and a talkback mic amp built in to the ACU. The talkback microphones can be controlled from multiple trigger sources and routed to multiple CUE paths.

  • Page 29: Illustration 14: Talkback-Cue Flow Diagram

    CUE INPUT 2 Σ CUE OUTPUT 2 TALKBACK SWITCH: MON>CUE RCU, EXT, A-B-C,OR MON>CUE GPIO CUE ASSIGN TALKBACK SWITCH CUE ASSIGN MON>CUE CUE INPUT 1 Σ CUE OUTPUT 1 CR MONITOR INPUT TALKBACK SWITCH: RCU, EXT, A-B-C,OR GPIO TALKBACK SWITCH CUE ASSIGN TALKBACK SWITCH: RCU, EXT, A-B-C,OR...
  • Page 30 The TALKBACK, ABC, and external talkback switches use an automatic latch/momentary operation. A quick press-release will latch the talback mic on. Press-release again to turn talkback off. Pushing and holding the talkback switch will activate talkback only while the switch is being held down (momentary mode).

  • Page 31: Illustration 15: Solo/Mute Page Keys

    MUTE Setup section of this manual. The m908 utilizes a single rotary push-button encoder for the control room speaker volume level, headphone volume level, and volume level preset recall. Pushing the VOLUME encoder toggles between Control Room and Headphone control.
  • Page 32 The Monitor Snapshots are assigned to A, B, or C User switches for easy access. Snapshots are "captured" from the current m908 monitoring settings. Up to 3 snapshots can be stored and assigned to the User A,B, and C switches.

  • Page 33: Illustration 16: Home Screen With Downmix Active

    Pushing the switch will turn off the Monitoring Snapshot and the switch LED will extinguish. Pushing the switch again will recall the stored Monitor Snapshot. The m908 allows for flexible routing of input signals to Meter Outputs. AUDIO INPUTS...
  • Page 34 Meter Output setup section of this manual for details on Meter Output routing. The m908 contains a predefined set of downmix mixers. Each mixer contains downmix level parameters. These parameters are set to default Dolby metadata values in most cases. Downmix templates are accessed by adding a template to a Monitoring Snapshot.
  • Page 35 Clock Display will indicate the lock status. If the System Clock is present but not at a valid sample rate the m908 will attempt to lock to the audio data source and play audio.
  • Page 36 The m908 does not contain a sample rate converter. If the clock source is set to a source that is not the same as the audio data source then it is assumed that the audio data will be at the same sample rate and be synchronous to the clock source.

  • Page 37: Illustration 18: Word Clock Flow Diagram

    The Word Clock output jack is buffered and is designed to drive a 75Ω line at 5V. s-LOCK WC IN WC OUT CLOCK TERM CLOCK OUT 75Ω Illustration 18: Word Clock Flow Diagram If the clock output parameter is set for <system clock> and the m908 is being synchronized to an external word clock, the Word Clock output will be a re-clocked low jitter version of the incoming clock.

  • Page 38: Illustration 19: Acu Temperature Error

    If any of these voltages fall outside of the permitted tolerance then this will be communicated to the ACU and a warning will appear on the RCU display screen. If this error occurs contact Grace Design Technical Support Illustration 20: PSU Error The RCU and ACU communicate over a balanced RS485 serial link.

  • Page 39: Illustration 21: Communication Error

    Illustration 21: Communication Error The m908 conatins a cooling fan that will turn on if the internal temperature of the m908 rises above a preset level. At power up the ACU processor tests the fan to ensure that it is runs at the proper rpm.

  • Page 40: Illustration 23: Workflow Setup Flowchart

    Note that the number of channels assigned to the speaker system represents the maximum number of speakers that can be used. However, the m908 supports multiple speaker systems so, for instance, with the example above you could have a 7.1, 5.1 and stereo speaker system connected to the m908.

  • Page 41: Illustration 24: Main Workflow Setup Screen

    The m908 ships from the factory with one workflow installed. This workflow is called ATMOS 7.1.4. If this matches your speaker system requirements then you can skip Workflow...

  • Page 42: Illustration 25: Select Workflow To Edit Screen

    In the right hand window there is a list of all of the available user workflows. If this is a new m908 there will be only one workflow listed (ATMOS 7.1.4) The currently loaded workflow will be highlighted in the list. At the top of the list is the <exit> menu option.

  • Page 43: Illustration 26: Editing Workflow Screen

    Illustration 26: Editing Workflow Screen In the right window the following menu items are: 1. <cancel> Returns to the previous screen. Asks if you want to exit without saving. 2. <save and exit> Saves the changes to the edited workflow and returns to the previous screen.
  • Page 44 FRONTS HEIGHT FRONT TOPS LEFT LEFT HT LEFT FRONT 1 TOP LEFT CENTER LEFT SCREEN HT RIGHT FRONT 1 TOP LEFT SCREEN LEFT CENTER HT LEFT FRONT 2 TOP CENTER CENTER HT RIGHT FRONT 2 TOP RIGHT SCREEN RIGHT CENTER HT LEFT MIDDLE TOP RIGHT CENTER RIGHT SCREEN HT...

  • Page 45: Illustration 27: Workflow Channel Setup Screen

    Illustration 27: Workflow Channel Setup Screen In the channel setup screen the VOLUME encoder controls a highlight cursor that can be moved from speaker to speaker through all of the possible speaker positions. When a speaker is highlighted push the VOLUME encoder to enable/disable that speaker position. When the speaker is enabled it will be white.

  • Page 46: Illustration 28: Editing Workflow Rename Conflict

    dialog box will appear indicating the conflict. Illustration 28: Editing Workflow Rename Conflict Clicking OK in this dialog will return to the Workflow name editing screen so that another name can be entered. To cancel Workflow Rename select the CANCEL button on the rename keyboard. From the Editing Workflow screen clicking the <save and exit>...

  • Page 47: Illustration 30: Save Active System Workflow Changes Dialog

    Illustration 30: Save Active System Workflow Changes Dialog Exiting from the editing workflow screen returns to the main workflow setup screen. To exit this screen and return to the home screen press the flashing SETUP switch. Note that if any changes have been made to the workflow that affect the number of speakers, their positions, number of cue channels, talkback mics, or headphone status then there will need to be routing changes made in the regular setup menus to reconnect hardware inputs and outputs to the changed DSP channels.

  • Page 48: Illustration 31: Cancel System Workflow Changes Dialog

    The Select Workflow To Load screen displays a list of the Workflow presets that have been saved on the m908. While scrolling through the list of workflows the DSP channel allocations will be displayed on the left window. Push the VOLUME encoder to select a workflow. A...

  • Page 49: Illustration 33: Load System Workflow Dialog

    Illustration 33: Load System Workflow Dialog Select YES to load the workflow in to the m908. The system will be updated. Select NO to go back to the Select Workflow To Load screen. If YES is selected the system will be reconfigured to the new workflow and all monitor levels will be set to zero.

  • Page 50: Illustration 35: Select Template For New Workflow

    Click YES to create new workflow. This will add the new workflow to the list of available user workflows. You can load this workflow in to the m908 by using the <load> option. The new workflow will have the name of the template. If a workflow already exists with that name then -1 added to the end.
  • Page 51 ATMOS 5.1.4 ATMOS 5.1.2 The m908 can export and import workflows using a USB drive plugged in to the USB A connector on the rear panel of the RCU. The USB device must be formatted FAT16 or FAT32 for the RCU to recognize it. Workflows are saved in a json formatted text file with a .grw file name extension.

  • Page 52: Illustration 36: Select Workflow To Import From Usb

    Selecting a workflow will open a confirmations dialog box asking if you want to import the selected workflow. Illustration 37: Import Workflow from USB Dialog Select YES to import the workflow from the USB device to the m908. The following message will appear while the file is being transferred.

  • Page 53: Illustration 38: Import Workflow From Usb Status

    Select <exit> to exit the Select Workflow To Import screen without importing a new workflow. In the unlikely event that the m908 experiences a USB file system error the following dialog will appear. Illustration 39: Import Workflow from USB Error Dialog If you encounter this error message click OK and try again.

  • Page 54: Illustration 40: Export Workflow To Usb

    Illustration 41: Export Workflow to USB Confirmation Select YES to export the workflow from the m908 to the USB storage device. The following message will appear:...

  • Page 55: Illustration 42: Export Workflow To Usb Status

    Illustration 43: Insert Proper USB Drive Message Make sure that the USB memory device is inserted and that it is formatted FAT16 or FAT32. In the unlikely event that the m908 experiences a USB file system error the following dialog will appear.

  • Page 56: Illustration 44: Export Workflow To Usb Error

    Illustration 44: Export Workflow to USB Error If you encounter this error message click OK and try again. If the problem persists contact Grace Design Technical Support. The Select Workflow to Delete screen list the available workflows on the system. Scroll to the workflow to delete and click.

  • Page 57: Illustration 46: Delete Workflow Confirmation

    .If you attempt to delete the current workflow this message will appear: Illustration 47: Cannot Delete Active Workflow From the home screen pushing the SETUP switch once enters the m908 in to Setup Mode. The SETUP switch will flash slowly and the following screen will be displayed:...

  • Page 58: Illustration 48: Initial Setup Mode Dialog

    Illustration 48: Initial Setup Mode Dialog A single push of the SETUP switch will exit Setup Mode and save any changes that were made. A push long-hold of the SETUP switch will exit Setup Mode and prompt you to discard any changes that were made.

  • Page 59: Illustration 50: Edit Screen With Parameter Highlighted But Not Selected For Editing

    Save any changes by pushing the SETUP switch and exiting Setup Mode. The following section outlines the available Setup parameters in the m908. Throughout the m908 Setup menus there are lists of parameters that can be adjusted/edited. The conventional behavior is that turning the VOLUME encoder will scroll through this list while highlighting the available parameters.

  • Page 60: Illustration 51: Edit Screen With Parameter Highlighted And Selected For Editing

    From here, turning the VOLUME encoder will again scroll through the list of parameters. m908 features a name entry and editing keyboard interface. It is used in any setup menu where a name can be created or customized. Some examples are: •...

  • Page 61: Illustration 53: Number Edit Screen

    for entering Ethernet IP address and subnet mask numbers. Illustration 53: Number Edit Screen In the both screens the current name is displayed in the text edit window in the upper right portion of the screen. The maximum number of characters for a custom name is 12. The upper section of the keyboard contains numbers, letters, and special characters.

  • Page 62: Illustration 54: Name Edit Navigation Keys

    encoder. These switches will be flashing green. SOLO/MUTE Illustration 54: Name Edit Navigation Keys Several Setup screens contain channel routing options. The following signal types contain routing configurations: • Input Sources • Control Room Speakers • Cue inputs and outputs •...

  • Page 63: Illustration 55: Input Channel Setup Screen

    Illustration 55: Input Channel Setup Screen The source parameter shows the connector being used for the currently selected input. Clicking and scrolling through the list will display the available connectors. Clicking on a connector that is different from the current connector will disables the current channel selection and immediately mute the audio.

  • Page 64: [Replace Existing Route? Dialog]

    Push the SETUP switch then any of the 8 INPUT select switches will enter the Setup Input screen. The m908 has 16 inputs available with 8 inputs visible at a time. To change "input pages" push-hold the lower right INPUT (◄►) select switch.

  • Page 65: Illustration 58: Input Channel Setup Screen

    Illustration 58: Input Channel Setup Screen The Channel Setup screen is where input channels are enabled and routed to DSP input channels. The left side of the screen window shows all of the available DSP input channels enabled in the current Workflow.

  • Page 66: Setup

    For use on stereo digital inputs where the incoming digital signal was recorded with Red Book 15-50us pre emphasis. Auto: The m908 looks for the emphasis bit in the AES or spdif channel status. If present the m908 will apply the de-emphasis filter.

  • Page 67: Illustration 59: Setup Dim Screen

    Illustration 59: Setup Dim Screen Push the SETUP switch then the DIM switch to enter Dim setup. This screen contains the following a list of setup parameters that can be highlighted by turning the VOLUME encoder knob. The available parameters are: •...

  • Page 68: Illustration 60: Setup Speaker Cr Screen

    Illustration 60: Setup Speaker CR Screen This screen contains the following list of setup parameters that can be highlighted by turning the VOLUME encoder knob. The available parameters are: • speaker name Clicking this option enters the Name Edit Screen. (see navigating the Standard Name Editing screen).

  • Page 69: [Replace Existing Route? Dialog]

    room output. Speakers that are disabled are gray. The currently selected speaker channel has a white box around it. On the right side of this screen there is a list of options and the top item is highlighted initially: ◦ channel name The name of the currently currently selected channel in the left window.

  • Page 70: Illustration 62: Bass Management Setup

    The m908 bass management configuration is contained in the Control Room Setup screen. Push the SETUP switch and then any of the CR1, CR2, or CR3 speaker select switches to enter the Setup Speaker screen. Click on channel setup to enter the Channel Setup screen.

  • Page 71: Illustration 63: Setup Solo/Mute Initial Screen

    Illustration 63: Setup SOLO/MUTE Initial Screen This screen contains a speaker layout area on the left and instructions in the right area. CURRENTLY SELECTED SOLO/MUTE SWITCH Illustration 64: Setup Solo/Mute • Push any solo/mute switch (L, C, R, LS, SUB, RS, LB, or RB). The text band at the top of left area of the screen will show which solo/mute switch is selected and the speaker (or speakers) that is mapped to the selected switch will be green.

  • Page 72: Illustration 65: Speaker Eq Parameter Screen

    The m908 room correction EQ is accessed through the Control Room Setup screen. Push the SETUP switch and then any of the CR1, CR2, or CR3 speaker select switches to enter the Setup Speaker screen. Click on channel setup to enter the Channel Setup screen.

  • Page 73: Illustration 66: Setup Monitor Screen

    band select mode. ◦ Turn the VOLUME encoder to select the EXIT bar on the right side of the screen to exit EQ and return to channel setup. Push the SETUP switch then press-hold the VOLUME encoder to enter Monitor Control setup screen.
  • Page 74 • exclusive output mode Sets the exclusive output mode of the m908. Options are: <off, standard, mute speakers, mute headphones> ◦ off: Speaker system and headphones are on all of the time. ◦ standard: Headphones are muted when speaker Volume Control is active. Speaker system is muted when the headphone Volume Control is active.

  • Page 75: Illustration 67: Setup Mono Screen

    Push the SETUP switch then the MONO / (L-R) switch to enter the Setup Mono screen. Illustration 67: Setup Mono Screen This screen contains the following a list of setup parameters that can be highlighted by turning the VOLUME encoder knob. The available parameters are: •...

  • Page 76: Illustration 68: Setup L-R Screen

    Illustration 68: Setup L-R Screen This screen contains the following list of setup parameters that can be highlighted by turning the VOLUME encoder knob. The available parameters are: • offset Sets the amount of attenuation upon subtracting the Right from Left channel. This parameter can be adjusted from 0 to -12dB in 0.5dB steps.

  • Page 77: Illustration 69: Setup Cue Outs Screen

    Illustration 69: Setup Cue Outs Screen This screen contains the following list of setup parameters that can be highlighted by turning the VOLUME encoder knob. The list of parameters will vary depending on how many Cue channels are enabled in the current Workflow. The available parameter list below will repeat for each Cue path in the current Workflow: •...

  • Page 78: Illustration 71: Setup Mute Screen

    ◦ source L ch Selects the left channel source connector channel. Scroll through this list and choose the desired input connector channel. ◦ source R Selects the right channel source connector. Scroll through this list and choose the desired input connector. ◦...

  • Page 79: Illustration 72: Setup Abc User Switch Screen

    This screen contains the following setup parameter that can be adjusted by pushing the VOLUME encoder knob. • mode The Mute control can be enabled for the following monitor paths: speakers + headphones speakers only headphones only Push the SETUP switch to save and exit Setup Mode. Push the SETUP switch then push the A, B, or C User switch to enter the Setup User switch screen.

  • Page 80: Illustration 73: User Switch Setup For Monitor Snapshot

    Downmixing is included in the Monitor Snapshot feature. See the Monitor Snapshot setup below. To create a Monitor Snapshot first set all of the m908 controls for the desired monitoring configuration. Input select, Control Room output select, Speaker volume, Headphone volume, Mono, solo/mute, can all be captured in the Snapshot.

  • Page 81: Meter Output Setup

    The list of available sources will include all of the system inputs <INPUT 1-16, input monitor select pre, input monitor select post>. ◦ <INPUT 1-16> refers to defined INPUT sources for the m908. Choosing one of the inputs will fix the Meter outputs to the selected input. There will be no changes to the signal level.

  • Page 82: Illustration 74: Meter Output Setup Screen

    Illustration 74: Meter Output Setup Screen The Meter Output Setup screen is where the meter source signals are routed to physical output connectors. The left side of the screen window shows all of the available signals enabled in the current Workflow.

  • Page 83: Illustration 75: Setup Talkback Screen

    To exit the Meter Output Setup screen and return to the System Setup screen press the MUTE switch. Push the SETUP switch then the TALKBACK switch to enter the Setup Talkback screen. NOTE: the current state of talkback will be unchanged by this action. Once in Talkback setup, the TALKBACK switch returns to normal operation.

  • Page 84: Illustration 76: Setup Talkback Switch Assign Screen

    • rcu switch mic assign Sets which talkback mic is activated by the RCU TALKBACK switch. Options are <rcu mic only, ext mic only, rcu and ext. mic> • rcu switch cue assign Selects Cue paths to route the talkback signal to when the RCU TALKBACK switch is pushed.

  • Page 85: Illustration 77: Setup Spl Meter Screen

    mode they will be listed here. Options are <rcu mic only, ext mic only, rcu and ext. mic> • gpio 1234 cue assign Selects Cue paths to route the talkback signal to when the GPIO 1, 2, 3, or 4 external switches are closed. If any of the GPIO 1, 2, 3. or 4 pins have been configured for Talkback mode they will be listed here.

  • Page 86: Illustration 78: Setup System Screen

    Options are <internal, wordclock, usb, option io, aes-1, aes-2, aes-3, aes-4, spdif, optical- 1, optical-2> ◦ internal Sets the clock source to be the internal clock generator in the m908. ◦ wordclock Sets the clock source to the Word Clock input. The system will synchronize to the incoming word clock.
  • Page 87 Push the Setup switch to save changes and exit Setup Mode. The m908 has 4 GPIO (General Purpose Input/Output) pins on various rear panel connectors. These pins can be configured as logic level inputs or outputs and can be mapped to various functions.
  • Page 88 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 89: Illustration 79: Gpio Jumper Locations

    GPIO# CONNECTOR Voltage Select Jumper +3.3V/+5.0V AES3 1 AES3 2 AES3 3 RCU DB15 ACU REAR PANEL J47: GPIO 3 C291 C290 J46: GPIO 2 C289 C288 J45: GPIO 1 C285 C284 J50: GPIO 4 C422 5V IO C421 GPIO 3V3 IO PSUTX Illustration 79: GPIO Jumper Locations...

  • Page 90: Illustration 80: Gpio Schematic Diagram

    Sets the Word Clock input connector termination. Options are <48k ohms, 75 ohms> If the m908 is being fed directly from a word clock source and it is the only receiver then set the termination to 75Ω. If the m908 Word Clock input is being fed...
  • Page 91 When clock in is selected the Word Clock output buffers and re-transmits the incoming word clock. When set to system clock the Word Clock output transmits the system clock. Use the system clock setting when the m908 is the clock master in a studio. •...

  • Page 92: Illustration 82: Adc Jumper Locations

    1-2 of the ADC. If one ADC option is installed in the m908 then the two stereo connectors are installed as well. The second ADC option module only has 8 channels in on DB25.

  • Page 93: Illustration 83: Dante Option Module

    When configured for 16 channel operation the EXPANSION port is active so that an additional HD IO device can be added to the system. When configured for 32 channel operation all 32 channels of the Digilink cable are allocated to the m908 and the EXPANSION port is not active.

  • Page 94: Illustration 84: Digilink Option Module

    The phono amplifier can be optimized for a wide range of phono cartridges via a number of internal jumper settings. To access these jumpers, remove the top cover of the m908 and refer to the Jumper Location diagram below. Be sure to unplug the AC power cord before removing the...

  • Page 95: Illustration 85: Riaa Phono Module Jumper Locations

    Illustration 85: RIAA Phono Module Jumper Locations The m908 ships with a standard USB type A to type B cable. The type A connector plugs in to the computer and the type B connector to the m908 USB Audio jack.
  • Page 96 In the event that you have any setup issues which aren’t addressed by these resources, feel free to contact us directly at 303.823.8100, Monday through Friday 9 – 5, MST. The m908 USB ASIO driver is necessary for operating the m908 as an I/O device on a Windows computer.
  • Page 97 5. The driver installer will run and display the following dialog. Click "NEXT" to start the installation. 6. Choose the location you wish install the driver and click “Install” to proceed. It is recommended to use the default installation folder.
  • Page 98 8. To exit the installer click "FINISH" 1. With the driver installed properly and the m908 connected to your computer, there will be a blue and white “G” icon in the system tray, or “Grace Design USB Audio Control Panel” in the start menu.

  • Page 99: Illustration 86: Usb Audio Control Panel Status

    Illustration 86: USB Audio Control Panel Status 2. Buffer Settings displays the USB Streaming mode and the ASIO Buffer size: Illustration 87: USB Audio Control Panel Buffer Settings 3. The USB Streaming Mode sets the computer's USB latency performance, ranging from very low to high latency.

  • Page 100: Illustration 88: Usb Audio Control Panel Format

    4. The USB Format tab contains the Input and Output formatting options for the m908. The number of channels that can be streamed from the computer host is dependent on the maximum sample rate required. Illustration 88: USB Audio Control Panel Format 5.

  • Page 101: Electrical Specifications

    2. Unzip the contents of the firmware package to an empty USB flash drive formatted for FAT16 or FAT32 See document m908 Product Specifications Grace Design reserves the right to update or change the electrical specifications at any time. m908 System Flow Diagram.
  • Page 102 DB25 Pin# AES3 1 IN/OUT AES3 2 IN/OUT AES3 3 IN/OUT GPIO 1 GPIO 2 GPIO 3 Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+)
  • Page 103 Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Positive(+) Positive(+) Positive(+) Negative(-) Negative(-) Negative(-) Note: For unbalanced output operation leave the Negative (-) pin open PIN# Function PIN#...

  • Page 104: Illustration 90: Rcu Cable Wiring Diagram

    Illustration 90: RCU Cable Wiring Diagram SLEEVE To m908 ACU Remote Talkback Jack Normally open switch Illustration 91: Remote Talkback Switch Wiring...

  • Page 105: Illustration 92: Remote Talkback Switch With Led Tally

    TALKBACK CONTROL TALLY RING SLEEVE 1/4" TRS PLUG To m908 ACU Remote Talkback Jack Normally open switch Illustration 92: Remote Talkback Switch with LED Tally Talkback Balanced Output XLR GROUND SHIELD Illustration 93: Talkback Out Unbalanced Wiring ACU, RCU, and PSU dimension can be found in the m908 Product Specifications document.
  • Page 106 • During the time of this warranty, Grace Design will repair or replace, at its option, any defective parts or repair defective workmanship without charge, provided the customer has appropriate proof of purchase and that the product has its original factory serial number.
  • Page 107 Illustration 1: Audio and Clock Flow Diagram....7 Illustration 37: Import Workflow from USB Dialog..53 Illustration 2: audio path flow diagram......8 Illustration 38: Import Workflow from USB Status...54 Illustration 3: ACU Front Panel........8 Illustration 39: Import Workflow from USB Error Dialog.................54 Illustration 4: ACU Rear Panel........9 Illustration 40: Export Workflow to USB....55 Illustration 5: RCU Front Panel.........12...
  • Page 108 Illustration 72: Setup ABC User Switch Screen..80 Illustration 83: Dante Option Module......94 Illustration 73: User Switch Setup for Monitor Illustration 84: Digilink Option Module....95 Snapshot..............81 Illustration 85: RIAA Phono Module Jumper Illustration 74: Meter Output Setup Screen....83 Locations..............96 [Replace Existing Route? dialog]**......83 Illustration 86: USB Audio Control Panel Status..100 Illustration 75: Setup Talkback Screen......84 Illustration 87: USB Audio Control Panel Buffer...

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