Beschrijving
The m903 keeps everything great about its predecessors, 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.
Specificaties
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 0.5 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
Five year transferable warranty on parts and labor
SPECIFICATIONS ANALOG IN
Gain
Headphone output, volume at max, trim at +9.5
+15dB
Balanced Line output, volume at max, trim at +9.5
+14dB
Unbalanced Line output, volume at max, trim at +9.5
+11dB
Frequency Response
@ 0dBu out +/- .25dB
22Hz 120kHz
@ 0dBu out +/- .5dB
12Hz 260kHz
@ 0dBu out +/-3dB
4Hz 600kHz
Maximum Input Level
Balanced Input
+22dBu
Unbalanced Input
+22dBu
Maximum Output Level
Unbalanced output @1kHz, 100k Ohm
+22.5dBu
Balanced output @1kHz, 100k Ohm
+27dBu
Headphone output @1kHz, 50 Ohm load
+20.4dBu
Impedance
Balanced Input
106K Ohms
Unbalanced Input
53K Ohms
Balanced Output
95 Ohms
Unbalanced Output
47.5 Ohms
Headphone Output
1.2 Ohm
Dynamic Range
@ 0dB gain
TBD
@ -10dB gain
TBD
THD+N
Headphone +10dBu out, 50 Ohm load, SMPTE 4:1
<0.01%
Headphone +10dBu out, 50 Ohm load
<0.008%
Unbalanced Line Out +10dBu out
TBA
Balanced Line Out +10dBu out
<0.002%
Attenuator
Channel matching
<0.05dB
Attenuator Range
99.5dB
SPECIFICATIONS D/A CONVERTER
Input Sample Rate
32, 44.1, 48, 88.2, 96, 176.4, 192kHz
THD+N
44.1kHz, 24bit, 1kHz, +20dBu out
<0.002%
Noise Floor
0dB gain, 22-22kHz
-94dBu
0dB gain, A-weighted
-97dBu
Output level
Unbalanced Output @ 0dBFS
TBD
Balanced Output @ 0dBFS
TBD
Power Requirements
120VAC
.16A
230VAC
.08A
Dimensions and Weight
Dimensions
H1.7 x W8.5 x D8.25
Weight
5 lbs (2.2kg)
Audiofile oordeel
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