Stax SRM400s headphone amplifier

STAX introduces a new semiconductor driver unit SRM-400S, the successor model of the SRM-353X. STAX custom-made low noise DUAL FET is installed on First Stage. And FET is also installed on Last Stage. The characteristics of right FET and left FET are measured strictly. Selected FET are installed as well as SRM-700S. SRM-400S succeeds to the design and the manufacturing method of the high end model SRM-700S, the amplifier which FET are installed in all stages.

SPECIFICATIONS

All-stage FET configuration DC amplification driver unit
Frequency response: DC - 90kHz (with one SR-L500 MK2)
Gain: 60dB
Harmonic distortion: 0.01% or less (1kHz/100Vrms output)
Input impedance: 50k Ω (RCA), 50k Ω x 2 (XLR)
Maximum output voltage: 400Vrms (1kHz)
Bias voltage: DC 580V
Operating temperature / humidity: 0 to 35 degrees celsius / less than 90% (non condensing)
Input terminal: RCA x 1, XLR x 1(mutual exclusion input)
Output: RCA parallel output terminal
Power consumption: 30W
Dimension: 195 (W) x 102 (H) x 376 (D) mm (maximum protruding portion included)
Weight: 3.4kg