M920 High Resolution Monitoring System
The m920 High Resolution Monitoring System - Impeccable, pedigreed audio performance for discerning audio professionals and connoisseurs. The m920 stands on the shoulders of its predecessors then jumps to new territory in digital and analog audio performance. Using the latest 32Bit Sabre DAC technology, it delivers up to 384kHz PCM and 64x and 128x DSD playback. The m920 provides state of the art DAC performance in our award winning compact, do everything utility design. For home or studio, this is truly the ultimate, high resolution monitoring system.

For that moment when you fall back into the chair and the music coming through inhabits your being. In this world of endless distraction, the goal is to achieve limitless engagement. And that is what the m920 is designed to do. Whether you are mixing, mastering or simply listening - the resolution, detail and immediacy that occurs with the m920 at the center of your system will help pull you out of the din and in to the music.

Building on 15 years of experience designing reference playback equipment, the technology in the m920 is highly evolved and refined. Each time we set out to improve a design, the goals are always clear: Lower the distortion, improve the noise performance, lower the DAC's jitter, make it more reliable. Make it better. With the m920, we hit the all bullseyes. The new, world-class M Series 32-bit Sabre DAC provides an astonishing improvement in digital performance. Redesigned s-Lock PLL circuitry improves jitter rejection. DSD64 and DSD128 playback brings great musicality to digital recordings. Every performance and design element was concidered and where improvements could be made, they were. This is truly pinnacle for high resolution playback. And best of all, its available now from your favorite Grace Design Dealer.


Features

Stereo analog inputs - balanced (+4dBu) XLR and unbalanced (-10dBv) RCA.

Ultra low distortion 32-bit /384khz Sabre DAC accepts stereo digital input sources in AES3, S/PDIF, TOSLINK (optical) and USB formats with auto sample rate detection and digital de-emphasis filter

User configurable DAC filter response for PCM and DSD playback

USB for playback of up to 384kHz / 32 bit PCM as well as DSD64 and DSD128 playback via DoP

AES and S/PDIF playback of up to 192kHZ / 24bit PCM as well as DSD64 playback via DoP

New dual-stage wide lock range PLL for improved jitter rejection on non s-locked sources

Third generation s-Lock™ dual stage PLL (phase lock loop) circuitry for the ultimate in low jitter clocking and sonic integrity

Two sets of line level outputs provided via RCA (unbalanced) and ¼ TRS jacks (balanced) for connection to stereo monitors

RCA line outputs can be configured for variable or fixed dac output mode for operation as a standalone digital to analog converter

Front panel rotary encoder provides precision level control of both headphone and the line output levels. Level adjustments are made in 0.5dB steps within a 95dB range

0.05dB channel level matching to ensure true stereo balance at any monitoring level

Large, white 7-segment display is used to show headphone and stereo main output levels

New X-feed (crossfeed) simulates the acoustics of a loudspeaker listening environment which can significantly improve imaging while reducing listening fatigue when using headphones. This feature employs carefully designed signal cross-feed, filtering and delay circuits to simulate hrtf (head related transfer functions)

High current transimpedance output amplifier design drives 8 ohm loads. The m920 was specifically designed with low impedance headphones in mind

Only the highest quality 0.5% metal film resistors are used throughout and there are no electrolytic capacitors in the signal path. Sealed gold contact relays are used for all signal switching

Infrared remote control for level control, left/right balance, mute and more when using the optional remote control unit

Apple IR remote control is supported with optional pairing

USB firmware upgradability

5 Year transferable warranty on parts and labor

ANALOG IN  

Gain - Balanced Input

Headphone output, volume at maximum 0dB

Balanced Line output, volume at maximum -0.5dB

Unbalanced Line output, volume at maximum -8.0dB

Frequency Response - Unbalanced In > Unbalanced Out

@ 0dBu out +/- .25dB 15Hz - 50kHz

@ 0dBu out +/- .5dB 9.5Hz - 72kHz

Frequency Response - Unbalanced In > Unbalanced Out 4Hz - 192kHz

Maximum Input Level

Balanced Input +22dBu

Unbalanced Input +16dBu

Maximum Output Level

Unbalanced output @1kHz, 100k Ohm load +22dBu

Balanced output @1kHz, 100k Ohm load +23dBu

Headphone output @1kHz, 50 Ohm load +20dBu

Impedance

Balanced Input 106K Ohms

Unbalanced Input 53K Ohms

Balanced Output 95 Ohms

Unbalanced Output 47.5 Ohms

Headphone Output 1.2 Ohm

Dynamic Range

@ 0dB gain, Balanced In > Balanced Out 116dB

@ 0dB gain, Balanced In > Headphone Out 117dB

THD+N Balanced Input

Gain <0.008%

Headphone Out @ +10dBu, 50 Ohm load <0.0050%

Unbalanced Line Out @ +10dBu, 100k Ohm load <0.00045%

Balanced Line Out @ +20dBu, 100k Ohm load <0.00075%

Attenuator

Channel matching <0.05dB

Attenuator Range 97.5dB

Output Noise Floor, Balanced Input  

Balanced Output, volume at maximum, 22-22kHz -93dBu

Balanced Output, volume at minimum, 22-22kHz -99dBu

Unbalanced Output, volume at maximum, 22-22kHz -103dBu

Unbalanced Output, volume at maximum, 22-22kHz -105dBu

Volume settings for unity gain

balanced in -> balanced out 95

unbalanced in -> balanced out 83

balanced in -> unbalanced out 99. with Offset +8.

unbalanced in -> unbalanced out 95

D/A CONVERTER

Input Formats: AES, S/PDIF, TOSLINK PCM (kHz): 44.1, 48, 88.2, 96, 176.4, 192, DSD64

Input Formats: USB PCM (kHz): 44.1, 48, 88.2, 96, 176.4, 192, 352.4, 384 DSD64, DSD128

Input Sample Rate 32, 44.1, 48, 88.2, 96, 176.4, 192kHz

THD+N

44.1kHz, 24bit, 1kHz, -1dBFS, Unbalanced Out @ +15dBu <0.0005%

44.1kHz, 24bit, 1kHz, -1dBFS, Balanced Out @ +15dBu <0.0005%

Output level

Unbalanced Output @ 0dBFS, Volume at maximum, trim at 0 +9dBu

Balanced Output @ 0dBFS, Volume at maximum, trim at 0 +17.6dBu

Unbalanced Output @ 0dBFS, Fixed DAC Output Mode +8.2dBu

Power Requirements

120VAC 0.16A

230VAC 0.08A

Dimensions and Weight

Dimensions H1.7" x W8.5" x D8.25"

Weight 5 lbs (2.2kg)