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Grace Design m905 with D/A Converter Demo/Open Box  From Grace

With stunning D/A sonic performance and timeless design, the m905 is a mark of genuine progress in the pursuit of high-quality audio production. Get ready to hear every nuance in your material like never before!

Grace Design


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Demo units have been demoed at Sound Pure, tested, or, in some cases, returned by a customer. They are guaranteed in perfect working order with full manufacturer warranty! Want us to confirm condition? Just give us a call.

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What We Think

Grace has gone above and beyond to ensure the M905 has not only some of the best sounding D/A converters you can buy, but they really were dead set on making the sexiest and sleekest design with the touch screen remote.  It is NOT all smoke and mirrors, just simply a fantastic touch to a design idea that has been in production (from previous models) for nearly a decade.  The m905 is the upgrade to the older m904 monitor solution as Grace redesigned every aspect of the box with the knowledge from the previous models.  

With the m905, updating the converters and bringing them to the highest quality was step one.  The D/A is the heart of your mixing platform as it affects every decision you make.  The D/A is incredibly detailed but isn't overly harsh or pushed.  It allowed us to really dive into our mixes and hear every aspect of what you are doing.  Whether you are polishing the 2 Buss for a mix or dialing just the right reverb for your vocals, you can rely on the D/A in the m905 to deliver.

Now for the part that tops it off, the Remote.  The touch screen design is just fantastic.  It gives you everything you need to set your studio up the way YOU want to monitor.  For us, one of the nicest features is being able to level match 2 different monitors inside the m905.  Nothing is worse than trying to make decisions, changing monitors and having the outputs drastically different between your small pair and large pair of monitors.  Just an example of the depth Grace went to in the design, you can calibrate every aspect of m905 to suit your needs.

Grace Design m905

  • Signal Chain
    • Grace Design m905 with D/A Converter

Manufacturer's Description from Grace

This is our second generation stereo monitor controller, engineered from the ground up to provide unrivaled sonic purity with a comprehensive and powerful feature set.

The m905 represents a new benchmark for audio playback quality. DAC performance is on par with the finest esoteric mastering equipment available. Our redesigned s-Lock™ PLL ensures ultra-low jitter clock regeneration. An asynchronous USB class 2 interface allows the m905 to act as the master clock of the computer's USB audio bus, effectively eliminating 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 musical playback of any input source.
All main audio and power supply circuitry is housed in a 2U rack mount mainframe, while system control is managed by a sleek, ergonomic remote control unit. This new RCU is a combination of dedicated hardware and a color graphical LCD display. All primary monitoring features are accessed via hardware switches and a rotary encoder, while all system information is presented by the graphic LCD and illuminated switches. This hybrid design allows for the solid feel and function of traditional hardware with the added power and functionality of a graphical user interface.

The GUI is designed so that any engineer unfamiliar with the m905 can use the system immediately and confidently. Then with a minimal time investment, advanced functions can be accessed and controlled with ease. Additional features include: naming individual inputs and speaker outputs, calibrating level offsets of any input and output, setting preset 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 to any previously visited setup menu, its previous edit status is remembered, keeping redundant navigation and editing to a minimum.

Grace Design

About Manufacturer

Audio engineer/designer Michael Grace originally began building single order custom audio products for a small, devout following of recording engineers and artists is 1990. Before long, the word had spread about Michael's custom microphone preamplifier designs, which were said to outperform anything else that was commercially available. Based on an increasing demand for his mic preamp design, in 1994 Grace Design was founded and began production of the original 801 mic preamp. Not only did the 801 provide a new level of audio performance and functionality, it helped to establish outboard microphone preamplifiers and direct-to-tape recording as a new standard in professional audio production. Over the years, Grace Design has maintained a steady, methodical pace to developing new products and technologies. Our product line has evolved into a definitive collection of microphone preamplifier configurations and other unique professional audio products. While the professional audio industry is inundated with products seemingly designed for obsolescence, we pride ourselves on providing audio professionals with the finest tools imaginable. Located in Boulder, Colorado, Grace Design continues its mission into the new millennium. As our company grows, we continually strive to improve our production methods to make sure theya re exact, efficient and environmentally sound. Their employees are treated like family and they strive to improve our production mehods to make sure they are exact, efficient and environmentally sound. Our employees are treated like our family and we strive to maintain our business relationships as friendships. And above all, we remain driven by the original passion that founded the company- the love of music.


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 3Hz to 275kHz
Dynamic Range
20-22kHz bandwidth 118dB
20-22kHz bandwidth and A weighting filter 121dB
Output Noise
20-22kHz bandwidth, at -20dB gain -99dBu
20-22kHz bandwidth and A weighting filter, at -20dB Gain -102dBu
Phase Deviation
20Hz to 20kHz <10 degrees
10Hz to 100kHz < 19 degrees
Crosstalk any channel
100Hz <104dB
1kHz <100dB
20kHz <79dB
Balanced Input CMRR
60Hz >90dB
1kHz >85dB
10kHz >70dB
Gain Range -104dB to +13dB
Channel Tracking Accuracy
Any channel +/-0.1dB
Maximum Output Level +26dBu
Maximum Input Level
Balanced inputs +29dBu
Unbalanced inputs +21dBu
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 0.0006%
Dynamic Range
20-22kHz bandwidth, 0dBFS = +20dBu (AES17 filter) 117dB
20-22kHz bandwidth, 0dBFS = +20dBu (A-weighted) 119dB
Input Lock Range
AES3/SPDIF 44.1kHz +/-400Hz
48kHz +/-700Hz
88.2kHz +/-1200Hz
96kHz +/-1300Hz
176.4kHz +/-2000Hz
192kHz +/-2000Hz
TOSLINK 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 44.1, 48, 88.2, 96, 176.4, 192kHz
s-Lock™ Capture Range
44.1kHz +/- 6Hz
48kHz +/- 7Hz
88.2kHz +/- 14Hz
96kHz +/- 20Hz
176.4kHz +/- 24Hz
192kHz +/- 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 N/A
Power consumption 60W
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 7.8lbs
Remote control unit 2.2lbs





m905 manual