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Grace Design m902

The Grace Design m902 is built upon the remarkable success of the venerable model 901 headphone amplifier, with the addition of many new and essential features. It is designed to be an invaluable tool for any critical audio application for which reference quality headphone amplification is required.

Professionals and audiophiles alike will be simply floored by the m902’s latest generation, high performance 24/192 DAC, which includes the unique s-LockTM dual stage PLL (Phase Lock Loop) for extremely low intrinsic jitter and rock solid digital performance. A full compliment of analog and digital inputs are available (AES3, S/PDIF, TOSLINK and USB), which are all selectable via a front panel rotary switch.

The core of the m902 is the meticulously designed high-current transimpedance amplifier circuitry, which is designed to effortlessly drive even the lowest impedance headphones and provide the high-resolution and low-level ambient detail for which all Grace Design products are famous. Familiar recorded material becomes at once transparent and alive, and critical details in editing and mastering become obvious and easy to manipulate.

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.

The m902 also cleverly adds stereo unbalanced analog line outputs for connection to studio monitors or any speaker system, allowing it to double as an elegantly simple high fidelity monitor controller or even a purist audiophile preamplifier / DAC.

As the logical update of the model 901, the new m902 reference headphone amplifier stakes its claim as the final word in reference headphone amplification and as the new must have tool for audio playback in any environment.

Gain
Gain	+0dB
Boost Mode	+10dB
Frequency Response
@ 0dBu out +/- .25dB	22Hz - 120kHz
@ 0dBu out +/- .5dB	12Hz - 260kHz
@ 0dBu out +/-3dB	4Hz - 600kHz
Maximum Output Level
@1kHz, 50 Ohm load	+21.4dBu (9.11Vrms)
Impedance
INPUT	106K Ohms balanced
INPUT	53K Ohms unbalanced
OUTPUT	1 Ohm
Dynamic Range
@ 0dB gain	116dB
@ -10dB gain	119dB
THD+N
+10dBu out, 50 Ohm load SMPTE 4:1	<0.01%
Headphone +10dBu out, 50 Ohm load	<0.08%
Line Out +10dBu out	<0.002%
Attenuator Level Matching
24 position switch	<0.05dB
Attenuator Range	99.5dB
D/A Specifications
Input sample rate	32, 44.1, 48, 88.2, 96, 176.4, 192kHz
THD+N
44.1kHz, 24-bit, 1kHz, +20dBu out	<0.002%
Noise Floor
0dB gain, 22-22kHz	-94dBu
0dB gain, A-weighted	-97dBu
Power Requirements
115VAC	.16A
230VAC	.08A
Dimensions and Weight
Dimensions	8.5w x 8.25d x 1.7h
Weight	5 lbs/2.2kg

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