PRODUCED IN 2007. ITS CURRENT SUCCESSOR IS S5.

Inputs:
S/PDIF electrical, 75 Ohm unbalanced; BNC connector; transformer coupled, with capacitively coupled or floating ground
USB 1.1 compliant; standard USB B connector; works with native Windows XP drivers

Sampling Frequency:
S/PDIF input: 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz
USB input: 32kHz, 44.1kHz, 48kHz

Outputs:
Unbalanced (RCA), transformer or directly coupled,
and balanced (XLR), transformer coupled;
2V RMS both

Output Impedance (20Hz-20kHz):
Transformer coupled output: < 90 Ohm
Directly coupled output: < 4 Ohm

Frequency Response:
Sin(x)/x equivalent:
@ fS=44.1kHz: 0dB @ 20Hz, -3.2dB @ 20kHz
@ fS=88.2kHz: 0dB @ 20Hz, -0.8dB @ 20kHz

Transient Response:
Transient response is clean and damped, with no overshoot.
The picture shows a 10kHz square wave response, transformer coupled output.

Absolute Phase:
Correct

Harmonic Distortion:
0.012% @ 1kHz, 50% full scale (-6dBFS), I/V dominated
0.007% @ 1kHz, 10% full scale (-20dBFS), D/A dominated
0.7% @ 1kHz, 0.1% full scale (-60dBFS), D/A dominated

Intermodulation Distortion (CCIR):
0.035%

Mains voltage:
220-240VAC, 50-60Hz, IEC (C14) connector
110-120VAC, 50-60Hz is also available

Dimensions (W x D x H):
431.5 x 320 x 102 mm (including knobs, connectors and legs)
431.5 x 278 x 78 mm (excluding knobs, connectors and legs)

Weight:
Approx. 9 Kg