Grace - M902 Headphone Reference Amplifier DAC

Presenting the audio microscope. Simply plug in your favorite headphones, cue up your favorite reference material and get ready to hear, literally, what you’ve been missing, courtesy of the m902 reference headphone amplifier.

At the core of the m902 is our audiophile, high-current transimpedance amplifier circuitry, which effortlessly drives even the lowest impedance headphones and provides the high-resolution and low-level ambient detail for which all Grace Design products are famous. This circuitry makes familiar recorded material become at once transparent and alive, while critical details in editing and mastering become obvious and easy to manipulate.

Professionals and audiophiles alike are continually floored by the m902’s high performance 24bit/192kHz DAC, which includes our unique s-Lock™ dual stage PLL (Phase Lock Loop) for extremely low intrinsic jitter and rock solid digital performance.

A full complement of analog and digital inputs are provided (AES3, S/PDIF, TOSLINK and USB), which are selectable via a front panel rotary switch.

The m902 cleverly adds stereo unbalanced or optional balanced (m902b) analog line outputs for connection to powered studio monitors or amplifiers. This allows it to double as an elegantly simple high fidelity monitor controller or even a purist audiophile preamplifier / DAC. And, similar to its big brothers (m906, m904), the m902provides some essential user calibration settings which help it to integrate into any playback environment.

The m902 includes a crossfeed circuit, or XFeed, which simulates the natural acoustics of a loudspeaker listening environment and HRTF (Head Related Transfer Functions). This circuitry, designed by Dr. Jan Meier, can significantly improve imaging, while reducing listening fatigue when using headphones.

Celebrated by audiophiles and audio engineers alike, the m902 is our crossover smash hit and is a must have for anyone searching to discover new depths in music and sound.

 

Features:

• balanced and unbalanced analog inputs
• 24bit/192kHz digital stereo inputs- AES3, S/PDIF, TOSLINK and USB (USB input supports 16 bit/44.1 and 48k only)
• s-Lock™ phase lock loop sample clock regeneration for ultra-low jitter and rock solid digital stability
• high-current transimpedance headphone amplifier circuitry built to effortlessly drive low impedance headphones
• unbalanced variable level analog line outputs for studio monitors
• all electrical and mechanical design elements maximized for absolute purist, audiophile performance
• precision level control with a 99.5dB range in .5 dB steps
• channel level matching accuracy of 0.05dB
• crossfeed circuitry (XFeed) for improved Headphone imaging
• internal linear power supply with custom wound toroidal transformer
• no electrolytic capacitors in the signal path
• highest quality metal film resistors used throughout
• sealed gold contact relays used for all signal switching

Specifications:
Headphone Amplifier with digital and analog inputs
Input sample rates: 32–192kHz, (USB input supports 16 bit/44.1 and 48k only)
Maximum voltage gain: 0dB (Normal), 10dB (Boost)
Frequency response at 0dBu output: 4Hz–600kHz, ±3dB
Maximum output level: 21.4dBu (9.11V RMS)
Input impedance: 106k ohms balanced, 53k ohms, unbalanced
Output impedance: 1 ohm
THD+N: 0.08% at 10dBu into 50 ohms (headphone); 0.002%, at 10dBu into 50 ohms (line)
IMD (SMPTE 4:1): 0.08% at 10dBu into 50 ohms
Dimensions: 8.5" W by 8.25" D by 1.75" H
Weight: 5 lbs (2.2kg)

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