Audiophile Monitoring Control!

The Grace Designs m903 is a stereo reference headphone amplifier and monitoring controller housed in a sleek 1U half-rack enclosure. The m903 accommodates these different sources with rear panel XLR and RCA jacks, and both +4dBu and -10dBV sources are easily managed. A pair of stereo TRS outputs allow two pairs of headphones to be driven by the m903. AES3, S/PDIF, and optical digital sources are accepted via rear-panel XLR, RCA and TOSlink connectors respectively. Plus, there's a USB port allows you to pump your favorite pleasure-listening tunes through the m903 for a true audiophile listening experience.

Grace Designs m903 Headphone Amp/Monitor Controller Features at a Glance:

• Balanced and unbalanced analog inputs
  
• 24bit/192kHz digital stereo inputs- AES3, S/PDIF, TOSlink and USB
  
• High speed USB interface - completely asynchronous transfer mode allows for bit-perfect playback with zero interface induced jitter
  
• Driverless operation on Windows & Mac up to 96kHz/24bit
  
• Supports USB Class 2 audio specification for 192kHz/24bit operation on Windows & Mac (drivers needed for 192kHz operation under Windows)
  
• New generation DAC's and ultra low noise balanced current to voltage converter yields more musical performance compared to the m902
  
• Mono mode for checking mix phase issues (or listening to Pet Sounds)
  
• 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
  
• Balanced and unbalanced variable level analog line outputs
  
• Improved power supply architecture isolates headphone power amplifiers, line amplifiers, DAC's and digital logic
  
• Precision level control with a 99.5dB range in 0.5dB steps
  
• Channel level matching accuracy of 0.05dB
  
• Improved x-feed circuit eliminates perceived loss of low frequency content
  
• Optional infrared remote control available
  
• Internal linear power supply with custom wound toroidal transformer
  
• Sealed gold contact relays used for all signal switching
  
• Five year transferable warranty on parts and labor

Grace Design m903 Specs: Input Channels 6 Output Channels 2 Analog Inputs 2 x XLR, 2 x RCA Analog Outputs 2 x TRS Line Out, 2 x RCA Line Out, 2 x TRS Headphone Out Digital Inputs 1 x AES/EBU (XLR), 1 x Toslink, 1 x S/PDIF (Coax) Digital Outputs No Digital Outputs Controls per Channel Master Volume Form Factor Desktop Height 1.7" Depth 8.25" Width 8.5" Weight 5 lbs.