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Grace Design M920 一體機

Grace Design M920 一體機

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商品描述

Grace Desing M920

Professional studio monitoring, audiophile DAC and reference headphone amplifier, all in one powerful little box

 

The m920 High Resolution Monitoring System provides wide open, musical audio playback performance for discerning audio professionals and connoisseurs. In this world of endless distraction, the m920 is designed to enable limitless engagement. Whether you are perfecting the details of a mix or blissfully drifting around your favorite DSD downloads - the resolution, detail and immediacy that occurs with the m920 at the center of your system will place you deep in the heart of the music.

 

Performance and features to rival any playback hardware

 

Building on our 15 years of experience designing reference playback equipment, the technology in the m920 is as evolved as it is refined. The new, world-class M Series 32-bit Sabre DAC provides an astonishing improvement in digital performance, delivering up to 32bit/384kHz PCM and 64x and 128x DSD playback. This DAC allows the user to select between 3 different digital filter response curves: fast, slow and minimum phase – which helps tailor the DAC section to personal tastes. Third generation s-Lock PLL circuitry improves jitter rejection without the use of sample rate converters. Asynchronous USB playback allows bit-perfect audio playback from your computer.

 

Analog design is carefully executed to ensure signals are rendered perfectly regardless of what type headphone drivers, amplifiers or speakers are being used. High current transimpedance output amplifiers can easily drive 8 ohm loads, making the m920 a perfect choice for even the lowest impedance headphones. 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.

 

The m920 is one of the great values in high end audio

 

We began building compact headphone amp / DAC's over 15 years ago. So the m920 represents lots of refinement with the addition of years of real world customer feedback. We have thousands and thousands of happy owners of these products. While there are countless more affordable derivative devices available now, a careful examination of the refinement, performance and design of the m920 reveals a product that is a little bit more expensive but a lot more value. We design and build everything in the USA, and back it up with our unrivaled 5 year transferable warranty. Our customer service is second to none, with customer satisfaction to match.

 

For the Audiophile

 

With several IR remote control options, including the Grace Design remote, or the apple remote and iOS / Android via Logitech Harmony, DSD128 playback, and beautiful, stable, open audio performance, the m920 will grace your system and engage you with your collection like never before.

 

For the Professional

 

With two sets of studio monitor outputs, two headphone jacks, a wide array of input options and deep calibration options, the m920 is the perfect choice as your svelte, clean and perfectly appointed monitor controller.

 

Feature

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

Ultra low distortion 32-bit /384khz Sabre DAC accepts stereo digital input source 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

 

SPECIFICATIONS 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

@ 0dBu out +/-3dB 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

 

Headphone Out @ +10dBu, 50 Ohm load, SMPTE 4:1   <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

        

SPECIFICATIONS D/A CONVERTER

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

DSD64

 

Input Formats: USB PCM: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 352.4kHz, 384kHz

DSD64, DSD128

 

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)


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