The 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 our unique s-LockTM 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 available (AES3, S/PDIF, TOSLINK and USB), which are all selectable via a front panel rotary switch.

The core of the m902 is our 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.

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-LockTM 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
  
• variable level balanced or unbalanced analog outputs for studio monitors
  
• all electrical and mechanical design elements maximized for absolute purist, audiophile performance
  
• precision level control with a 95dB range in .5 dB steps
  
• channel level matching accuracy of 0.05dB
  
• crossfeed circuitry (XFeed) for improved headphone imaging
  
• optional infrared remote control available
  
• 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
  
• five year warranty on parts and labor

Grace m902 specifications