Stereo Reference Headphone Amplifer!
Replacing the venerable model 901 in Grace's product lineup, the new m902 is a stereo reference headphone amplifier and monitoring controller housed in a sleek new 1U, halfrack enclosure whose industrial design mirrors that of the company's m904 and m906 monitoring systems. The m902 has been designed to provide audio pros in music, post and live-sound with exceptional headphone as well as stereo mains monitoring, whether from an analog or digital stereo source.
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- Rear panel XLR's and RCA jacks accept stereo analog, balanced +4dBu and unbalanced -10dBV input sources, respectively.
- Ultra-low distortion 24-bit DAC included as standard and accepts stereo digital input sources in AES3, (XLR) S/PDIF (RCA) and TOSLINK (Optical) formats. Auto sample rate detection and digital de-emphasis filter - sample rates from 44.1 to 192kHz are supported.
- USB input provides a convenient way for user's to enjoy a reference quality monitoring experience when connected to their computer. This interface supports 16-bit audio at 44.1 or 48kHz sample rates.
- The m902 incorporates our unique s-LockTM dual stage PLL (Phase Lock Loop) circuitry for the ultimate in low jitter sample clock stability and sonic integrity.
- A pair of line outputs are provided via RCA jacks on the rear panel for connection to stereo monitors.
- A front panel rotary encoder provides precision level control of both headphone and line output levels and level adjustments are made in 0.5dB steps within a 95dB range.
- An astounding 0.05dB channel level matching ensures true stereo balance at any monitoring level.
- A large, blue 7-segment display is used to show headphone and stereo main output levels.
- Calibration modes provide a means by which a number of m902 system parameters may be adjusted for both headphone and mains outputs. There's also a display dim mode that turns off all LED's except for the main power switch LED.
- The m902 includes an exciting new feature labeled Xfeed that simulates the acoustics of a loudspeaker listening environment which significantly improves 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 25 Ohm loads. The m902 was specifically designed with low impedance headphones in mind.
- Only the highest quality 0.5% and 0.1% 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.
