Free UK Delivery30 Day ReturnsWorldwide DeliveryAudio Affair Facebook

Price Promise

Grace M903 Reference Headphone Amplifier


. 0 Reviews . Write a Review

Found it cheaper? Click here. SKU: 5580
Ex VAT: 1662.5

Available - Usually ships within 7 days

Condition:Brand new in original retail packaging

With this product, you earn 1995 loyalty point(s).

Where did you Find It Cheaper?

Seen this item cheaper elsewhere? Send us the link below with your details and we'll come back to you ASAP with a better price if we can offer one!


Warranty length 5 Years

Tech Specs

Balanced and unbalanced analog inputs
24bit/192kHz digital stereo inputs- AES3, S/PDIF, TOSLINK and USB
High speed USB interface
Driverless operation on Windows & Mac up to 96kHz/24bit
Supports USB Class 2 for 192kHz/24bit on Windows/Mac (drivers needed for Windows)
New generation DAC's and ultra low noise balanced current to volume converter
Mono mode for checking mix phase issues (or listening to Pet Sounds)
s-Lock phase lock loop sample clock regeneration
High-current transimpedance headphone amplifier circuitry
Balanced and unbalanced variable level analog line outputs
Improved isolated power supply for power ampl, pre amp, DAC sections
Precision level control with a 99.5dB range in 0.5 dB 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

Product Description

The Grace M903 is the most refined and feature rich headphone amp and DAC yet available from Grace Design, following on from the highly regarded M902 and M901 that came 4 and 10 years before respectively. The M903 keeps everything that was great about the M902, adds some useful new features, and ups the ante with even more breathtaking audio performance.

A new volume control provides higher headroom and lower distortion and noise. New generation DAC's and ultra-low noise balanced current to voltage converter yields even more musical performance compared to the m902. Improved s-lock PLL circuitry delivers even lower phase noise and jitter. An improved power supply isolates headphone amplifiers, line amplifiers, DAC's and digital logic, resulting in lower noise and distortion.

Perhaps the most exciting improvement is the all new high speed USB interface. This cutting edge technology provides a completely asynchronous data transfer mode which allows for bit-perfect USB playback with zero interface induced jitter. This new interface affords standard driverless USB Class 1 operation on Windows and Mac up to 24bit/96kHz and USB Class 2 audio for 24bit/192kHz operation on Windows and Mac (drivers needed for 192kHz operation under Windows). This is computer-based audiophile playback, perfected.

New crossfeed circuitry is even more useful and includes a gentle compensation to eliminate the perceived loss of low frequency content. Both balanced and unbalanced line outputs are now standard, with individual volume controls for each. We have even included a mono mode for checking a mix for phase issues or simply monitoring in mono. These improvements cement the m903 as the perfect compact, audiophile grade monitor controller, even for larger scale production environments with more than one set on monitors.

A full complement of analog and digital inputs are provided (balanced, unbalanced, AES3, S/PDIF, TOSLINK and USB), which are selectable via a precision rotary front panel switch. And we offer an updated optional infrared remote control, which provides essential control for anyone working out of reach of their m903.

Advancing the tradition of unmatched audio performance and functionality, the m903 is now the ultimate solution for high resolution audio playback. From the very top mastering engineers to the most discerning audiophiles – it is a must for anyone searching to discover new depths in music and sound.

Write Your Own Review

Write a Review

  • 1 star 2 stars 3 stars 4 stars 5 stars
    1 Star 2 Star 3 Star 4 Star 5 Star