Grace M905 Manual
  1. Manuals
  2. Brands
  3. Grace Manuals
  4. Controller
  5. M905
  6. Manual

Grace M905 Manual

Reference monitor controller
Hide thumbs
Table of Contents

Advertisement

Quick Links

Digital and Analog Versions
Owner's Manual Revision E
ACU Firmware v1.16
RCU Firmware v1.16
XMOS Firmware v1.16

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the M905 and is the answer not in the manual?

Questions and answers

Related Manuals for Grace M905

Summary of Contents for Grace M905

  • Page 1 Digital and Analog Versions Owner’s Manual Revision E ACU Firmware v1.16 RCU Firmware v1.16 XMOS Firmware v1.16...

  • Page 2: Table Of Contents

    While you will find the m905 is fairly straightforward to use, it is a very powerful unit and a great deal of user configuration is possible, so we recommend that you spend some time reading this manual to help avoid any common user difficulties.

  • Page 3: Important Safety Information

    4 Service Information The Grace Design m905 contains no user serviceable components. Contact Grace Design for repair and upgrade information. In the event that your Grace Design m905 needs to be returned to the factory, contact us for a return authorization number.

  • Page 4: M905 Features

    PCM sources. • Multi-mode SUB/ DAC/ METER out • Optional IR (infrared) remote control via Grace Design Remote, Apple Remote or iOS and Andriod with the Logitech Harmony Hub Remote • SUB out mode for stereo or multiple mono subwoofer outputs •...

  • Page 5: M905 Audio Control Unit Rear Panel

    10 channels up to setup menu. computer. m905 Analog Rear panel - digital inputs are not avail- Digital out provides a buffered digital loop-through of able - a second set of balanced Analog inputs via XLR a selected source via AES or S/PDIF.

  • Page 6: Audio Control Unit Front Panel

    HEADPHONE OUTPUT standard TRS 1/4” jack for head- AC mains power standby switch Illuminates green phones. Wired in parallel with the jack on the RCU. when m905 system is powered on. ALL SYSTEMS GO! Connection to headphones should be made using standard ¼” TRS stereo connectors.

  • Page 7: M905 Graphical User Interface

    DAC clock status - this area displays the main clock- the current speaker set selected and the current ing functions and status of the m905’s DAC. Top row monitoring level in 0.5dB steps. When the standard displays the selected digital input source, S/MUX level display mode is active (configured in SETUP) the (if enabled) and de-emphasis (if enabled).

  • Page 8: Unpacking And Installing

    Okay, let’s get started in making the necessary connections to get your m905 up and running. First thing to do is mount the m905 in a rack. If you’re not rack mounting the unit, you should attach the supplied rubber feet on each corner of the bottom cover so you won’t scratch it or the surface you place it on.

  • Page 9: Power-Up Sequence

    AES2 input is used for the right channel. Note that AES Dual Wire mode requires moving a jumper on the m905 digital PCBA inside the unit. See AES DW Setup in section 9 of this manual for details. Use of a high quality 110 Ohm balanced cable is recommended.
  • Page 10 If the Word Clock signal in your studio is being daisy-chained from unit to unit (including the m905), you’ll want to set the switch to 1M Ohm, which is essentially an unloaded setting. If the m905 is the only device being clock referenced (or the last unit in a daisy-chain of other high impedance units), you’ll want...

  • Page 11: Normal Operation Mode

    The m905 is a closed loop control system to ensure that the status reported on the RCU matches the ac- tual hardware setting in the ACU. Any changes made to the configuration of the system are transmitted to the ACU where they are processed and reported back to the RCU for confirmation.

  • Page 12: Volume Control, Preset & Headphone Mute

    „ VOLUME CONTROL, PRESET & HEADPHONE MUTE The m905 utilizes a single rotary pushbutton encoder for control of the speaker and headphone volume levels, level preset recall and headphone mute. Switching between speaker level and headphone level control is done by pushing and releasing the volume control knob. The current volume levels are indicated on the display with the active control being green and the inactive control in light gray.
  • Page 13 Speaker MUTE mutes the signal going to the selected speaker and sub (if assigned) output(s). When the speaker MUTE is active, the switch is lit solid red and the speaker MUTE icon is shown on the speaker status display. SOLO mode provides a means to monitor left or right channel program material exclusively. When SOLO mode is active, the button flashes red.
  • Page 14 When mon>cue is active, this switch is lit solid green. The type 2 SPL meter in the m905 RCU can hold the peak SPL measurement level (configured in SETUP). The SPL CLEAR function resets the displayed peak level.

  • Page 15: Display

    The optional IR receiver allows certain features of the m905 to be controlled via wireless IR remote control units. To activate an m905 for use with a remote control please refer to the ‘IR Remote SETUP’ section. The following section will detail the available features for each remote platform. All changes...
  • Page 16 GRACE DESIGN IR REMOTE CONTROL OPERATION - control is available for control of the m905. Several of the buttons on the remote have dual functions, ac- cessed by either a ‘press and release’ or a ‘press and hold’ action, and are described below: Grace IR Remote m905 Press &...

  • Page 17: Analog Only Option

    It 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 m905 and refer to the Jumper Location diagrams in chapter 18 of this manual. Be sure to unplug the AC power cord before removing the m905 top cover. ...

  • Page 18: Input Setup

    all of the adjustable system parameters, while still having access to most of the normal mode features. <figure - Setup Screen> From this screen, pushing any hardware switch will enter that features individual setup menu. From here, rotating the knob clockwise moves the white highlighted selection down. Rotating it counter- clockwise moves the white highlighted selection up.
  • Page 19 USB without being changed to other digital inputs. It is possible to switch the m905 to an analog source, since that will not cause a change in clocking in the digital sec-...

  • Page 20: Speaker Setup

    LOCK - In a situation where a digital input is outside the lock range of the s-lock pll, it can be helpful to disable the s-lock circuit. This parameter allows the s-lock to be independently disabled for each digital input. Available options are enabled and disabled. The DAC de-emphasis filter can be configured independently for each digital input.
  • Page 21 If the setup mode is changed or exited prior to selecting the “<”, any modifications to the name will be ignored. The volume level of each speaker system can be matched by adjusting the level offset on LEVEL OFFSET - each speaker output.

  • Page 22: Dim Setup

    -35dB to -5dB in 0.5dB steps. The default is -20dB. „ SUB / DAC / METER SETUP The m905 features a multi-funciton SUB/DAC/METER output. From the setup screen, pressing the sub mute button enters SUB/DAC/METER setup mode. Once this setup mode is active, pressing or holding the sub-mute / (sub-solo) button functions exactly as it does in normal mode.

  • Page 23: Cue Output Setup

    -100dB to +18.5 in 0.5dB steps. The default is -100dB. „ CUE OUTPUT SETUP The m905 features a dedicated cue output. From the setup screen, pressing the MON >CUE button en- ters cue setup mode. Once this setup mode is active, pressing the mon > cue button functions exactly as it does in normal mode.

  • Page 24: Talkback Setup

    Disconnect the m905 from its AC power by unplugging the AC power cable. Use a #2 Phillips screw- driver to remove the top cover from the m905. There are 8 screws to remove on the top cover, 4 on the top and 2 on each side.

  • Page 25: Mute / (Solo)

    To set the Talkback output mode: Disconnect the m905 from its AC power by unplugging the AC power cable. Use a #2 Phillips screwdriver to remove the top cover from the m905. There are 8 screws to re- move on the top cover, 4 on the top and 2 on each side. Be careful to discharge any static electricity on the outside of the chassis before touching any of the jumpers inside the m905.

  • Page 26: Display Setup

    To unpair this a remote, change this paramter to ‘no’ . The default is ‘no’ . In the event you do not want the m905 to respond to an Apple IR remote simply pair the remote to the m905 with your other devices turned off.

  • Page 27: Digi Loop Setup

    • Disconnect the m905 from its AC power by unplugging the AC power cable. • Use a #2 Phillips screwdriver to remove the top cover from the m905. There are 8 screws to remove on the top cover, 4 on the top and 2 on each side.

  • Page 28: Spl Meter Setup

    While it is difficult to perfectly model the very complex level, delay and frequency response characteristics of the head, the cross-feed circuitry in the m905 gives the brain some of the basic clues it needs and the result is a very...

  • Page 29: Communication Error Handling

    Below is a frequency response plot showing the response of the m905 cross-feed circuit. In this graph one channel of the headphone amplifier is driven. The two traces show the direct channel and the op- posite (cross-feed) channel.

  • Page 30: Computer Audio Setup

    3-10 from the ADAT input. For stereo digital sources, PCM sample rates up to 192kHz are supported as is DSD64. For the ADAT inputs, the m905 will send 8 channels of audio at 44.1/48kHz or 4 channels SMUX.
  • Page 31 For PC, the input stream format is selected in the USB Audio Driver Control panel as shown: Note: If your application does not require more than 2 input channels, the 2 input/2output setting is recom- mended as it requires less over all bandwidth of the USB connection.

  • Page 32: Computer Audio Requirements

    Regardless of the type of computer you will use to playback audio from, it must have at least one avail- able USB port. The m905 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 USB m905 input.

  • Page 33: Updating Rcu Firmware

    • Turn off the m905 and connect your computer via USB to the USB upgrader port on the m905 RCU. • Turn on the m905. The setup button will illuminate solid white on the remote control to indicate USB upgrader mode is active.

  • Page 34: Updating Acu Firmware

    • Download the m905 firmware package from the Grace Design Website and unzip it on your computer. • Turn off the m905 and connect your computer via USB to the USB upgrader port on the m905 ACU. • Turn on the m905. The m905 will enter USB upgrader mode instead of communicating with the m905 RCU.

  • Page 35: Updating Xmos Firmware

    • Download the m905 firmware package from the Grace Design Website and unzip it on your computer. • Turn off the m905 and connect your PC via USB to the USB 2 port on the m905 ACU. • Turn on the m905.
  • Page 36 • The progress of the upgrade will be indicated in a pop-up dialog box. DO NOT DISCONNECT THE DEVICE OR INTERRUPT POWER TO THE m905 WHILE THIS IS IN PROCESS. Once completed, power cycle the system. Should the firmware upgrade fail, start the XMOS firmware upgrade process over again.

  • Page 37: Specifications

    16 Specifications ANALOG I/O all specifications are subject to change THD+N at Maximum Volume, 1kHz, 22Hz-22kHz BW +20dBu out <0.0008% +10dBu out <0.0008% 0dBu out <0.002% Intermodulation Distortion SMTPE/DIN 4:1 50Hz, 7kHz @+20dBu out <0.002% @ 0dBu out <0.0015% Frequency Response Balanced Inputs +/-3dB 3Hz to 1.25MHz Unbalanced Input +/-3dB...
  • Page 38 D/A CONVERTER FIXED OUTPUTS all specifications are subject to change Output Levels User selectable (0dBFS) -76dBu to +24dBu in 0.5dB steps Fixed output trim range (0.5dB steps) THD+N 1kHz, -1dBFS, (0dBFS = +20dBu), 20-22kHz bandwidth 0.0006% Dynamic Range 20-22kHz bandwidth, 0dBFS = +20dBu (AES17 filter) 117dB 20-22kHz bandwidth, 0dBFS = +20dBu (A-weighted) 119dB...

  • Page 39: Block Diagram

    17 Block Diagram...

  • Page 40: Pcb Jumper Locations

    18 PCB Jumper Locations MAIN PCB JUMPER LOCATIONS DIGITAL I/O PCB JUMPER LOCATION ADAT REAR PANEL AES 2 WIRE J7: AES DUAL WIRE / ADAT SELECT...
  • Page 41 To adjust the cartridge loading to your specified value, connect an Ohm meter to the Left channel RCA input jack on the rear panel of the m905. Then, using a small screwdriver, turn VR1 until the desired resis- tance is reached. Repeat for the Right channel by turning VR2.

  • Page 42: Wiring Diagrams

    * presently unconnected, provisional for RS422 operation Do not use an o the shelf DB15 cable as the pinout will be incompatable. If you need a longer cable contact your Grace Design dealer or us directly. Talkback remote switch diagram SLEEVE...

  • Page 43: Cleaning And Maintenance

    21 Warranty Information • Grace Design warrants all of our products to be free of defective parts and workmanship for a period of five years. • This warranty period begins at the original date of purchase and is transferable to any person who may subsequently purchase the product during this time.

  • Page 44: Manual Revisions

    7/18/2013 26, 27 added USB up channel information 7/18/2013 added m905 Analog information 12/10/2014 added m905 IR remote information 12/10/2014 changed ACU, RCU & XMOS firmware Rev to 1.16 03/15/2017 added phono input option info added digital speaker output info...

Table of Contents

Save PDF