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Grace Design M905 監聽控制器

Grace Design M905 監聽控制器

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Grace Design M950

M905 Reference Monitor Controller


This is the world's finest stereo monitorcontroller, with built in mastering quality Digital to Analog Converters,audiophile-grade headphone amplifier and unrivaled system configuration tools.For hardworking audio professionals and studios that demand the very bestplayback available.


Two new product options are now available:


m905 Analog* (analog inputs only)


Infrared wireless remote option*


The is our second generation stereo monitorcontroller, engineered from the ground up to provide unrivaled sonic puritywith a comprehensive and powerful feature set.


The m905 represents a new benchmark foraudio playback quality. DAC performance is on par with the finest esotericmastering equipment available. Our redesigned s-Lock™ PLL ensures ultra-lowjitter clock regeneration. An asynchronous USB class 2 interface allows them905 to act as the master clock of the computer's USB audio buss, effectivelyeliminating interface induced jitter for computer audio playback. And finally,meticulous analog circuitry measures with outstanding numbers in dynamic range,distortion and noise performance, ensuring bracingly open, detailed and musicalplayback of any input source.


All main audio and power supply circuitryis housed in a 2U rack mount mainframe, while system control is managed by asleek, ergonomic remote control unit. This new RCU is a combination ofdedicated hardware and a color graphical LCD display. All primary monitoringfeatures are accessed via hardware switches and a rotary encoder, while allsystem information is presented by the graphic LCD and illuminated switches.This hybrid design allows for the solid feel and function of traditionalhardware with the added power and functionality of a graphical user interface.


Now supported is DSD 128x (5.6448MHz) viaDoP v1.1 (DSD over PCM frames). DSD audio can be sourced from the AES3, S/PDIFor USB digital inputs. While still a niche playback format, DSD has held itsground over the years, and now more and more content is available via download.And playback is now supported by a number of players. DSD sounds stunninglynatural, especially rendered through the rest of the playback circuitry of them905. So If you're the type to seek out this kind of fidelity, we can't recommendit enough.


The GUI is designed so that any engineerunfamiliar with the m905 can use the system immediately and confidently. Thenwith a minimal time investment, advanced functions can be accessed andcontrolled with ease. Additional features include: naming individual inputs andspeaker outputs, calibrating level offsets of any input and output, settingpreset levels, and much more. The setup menus only ever drill down one level,so the main operating screen is always one button away. And when returning toany previously visited setup menu, its previous edit status is remembered,keeping redundant navigation and editing to a minimum.


The m905 offers the ability to transfer upto 10 channels of digital audio (8-channels of ADAT and two of AES3, or S/PDIFor TOSLINK) over USB to a computer, making the m905 capable of operating as astandalone USB audio interface. This is an advanced feature as there are clockissues to be aware of, but it works and is documented in the owners manual.


With stunning sonic performance andtimeless design, the m905 is a mark of genuine progress in the pursuit of highquality audio production. Intuitive, reliable and beautiful, it is the perfectstudio centerpiece - home base for your ears, eyes and hands.


*the m905 Analog is now available withoutthe built in DAC. This system is offered for users who already have aninvestment in DACs, whether stand-alone or built into their interface. Systemconfiguration is exactly the same, with all the same great monitoring features,except no digital inputs and an second pair of balanced analog inputs. The m905Analog brings this world class performance into reach of almost any engineer orrecording studio. Also, users can always upgrade their m905 Analog to theDigital version at anytime.


**Also now available is the m905 IR RemoteOption, which is available on new or existing units (Digital and Analog). Thisfeature allows wireless infrared remote control of a select set of monitoringcontrols via the Grace Design Remote, a standard Apple Remote, or with iOS andAndroid via the Logitec® Harmony Remote.



l   Analog inputs - unbalanced, balanced, CUE, talkback mic (additionalbalanced input available on the m905 Analog)

l   Digital inputs - 2x AES3 (Single or dual-wire), 1 S/PDIF, 1 TOSLINK,ADAT (selectable in 4 pairs, or 2 pairs in S/MUX), USB, DSD128 (5.6448MHz)

l   Audio circuitry designed for completely transparent and musicalplayback performance

l   Asynchronous Class 2 USB playback supports up to 24 bit/192kHz

l   Mastering quality DAC circuitry with configurable de-emphasisfiltering

l   s-lock dual-stage Phase Lock Loop for ultra low jitter clockregeneration

l   Hybrid RCU with hardware switches, large level encoder and graphicalLCD

l   LCD display shows input, level, output, SPL and DAC status plus afull calibration menu

l   RCU includes built in microphone for talkback and onboard SPL meter

l   SPL meter features include level, peak, fast and slow modes, A &C weighting

l   Precision .5 dB step level control for speakers and headphones

l   Reference headphone amplifier circuitry, with outputs on both theRCU and ACU

l   Dedicated mono, dim, mute and sub mute switches

l   Mono mode can be set to L+R summed, L only in both channels, or Ronly in both channels L solo, R solo, L-R and sub solo modes are available

l   3 available stereo speaker outputs, with two assignable mono suboutputs (or single stereo sub output)

l   Multi-mode SUB/ DAC/ METER out

l   SUB out mode for stereo or multiple mono subwoofer outputs

l   DAC out mode for a fixed DAC output fed by the selected digitalinput

l   METER out mode fed by selected input signal (digital or analog),configurable with a fixed level or to follow yhe monitor level

l   Detachable RCU tilt base




THD+N at Maximum Volume, 1kHz, 22Hz-22kHz BW

+20dBu out


+10dBu out


0dBu out


Intermodulation Distortion SMTPE/DIN 4:1 50Hz, 7kHz

@+20dBu out


@ 0dBu out


Frequency Response

Balanced Inputs +/-3dB

3Hz to 1.25MHz

Unbalanced Input +/-3dB

3Hz to 275kHz

Dynamic Range

20-22kHz bandwidth


20-22kHz bandwidth and A weighting filter


Output Noise

20-22kHz bandwidth, at -20dB gain


20-22kHz bandwidth and A weighting filter, at -20dB Gain


Phase Deviation

20Hz to 20kHz

<10 degrees

10Hz to 100kHz

< 19 degrees

Crosstalk any channel







Balanced Input CMRR







Gain Range

-104dB to +13dB

Channel Tracking Accuracy

Any channel


Maximum Output Level


Maximum Input Level

Balanced inputs


Unbalanced inputs



Balanced inputs

88k Ohms

Unbalanced inputs

53k Ohms

Balanced outputs

300 Ohms

Minimum load impedance

300 Ohms

External Talkback Mic Preamp Gain

+7dB to +70dB in 1dB steps


Output Levels

User selectable (0dBFS)

-76dBu to +24dBu in 0.5dB steps

Fixed output trim range (0.5dB steps)


1kHz, -1dBFS, (0dBFS = +20dBu), 20-22kHz bandwidth


Dynamic Range

20-22kHz bandwidth, 0dBFS = +20dBu (AES17 filter)


20-22kHz bandwidth, 0dBFS = +20dBu (A-weighted)


Input Lock Range


44.1kHz +/-400Hz
48kHz +/-700Hz
88.2kHz +/-1200Hz
96kHz +/-1300Hz
176.4kHz +/-2000Hz
192kHz +/-2000Hz


44.1kHz +/-400Hz
48kHz +/-700Hz
88.2kHz +/-1200Hz
96kHz +/-1300Hz

8 Channels at 44.1kHz and 48kHz
4 Channels at 88.2kHz and 96kHz (s/mux)

44.1kHz +/-50Hz
48kHz +/-70Hz
88.2kHz +/-50Hz
96kHz +/-70Hz

USB Supported Sample Rates

44.1, 48, 88.2, 96, 176.4, 192kHz, DSD64 2.8224MHz, DSD128 5.6448MHz

s-Lock™ Capture Range


+/- 6Hz


+/- 7Hz


+/- 14Hz


+/- 20Hz


+/- 24Hz


+/- 30Hz

Word Clock / Superclock Input

Impedance (switchable)

75 ohm / 1Meg ohm

Minimum Voltage

3V peak to peak

Maximum Voltage

5V peak to peak

Word clock frequencies supported

44.1, 48, 88.2, 96, 176.4, 192kHz

Superclock frequencies supported



Power consumption


Input Voltage 50-60Hz

100VAC – 240VAC


Main chassis IEC 2U

3.5" x 10.5" x 17"

Remote control unit

8.9" x 5.1" x 2.2"


Main chassis


Remote control unit