Brand: Stax


Stax SRM-400S Headphone Amp (Silver)

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STAX introduces a new semiconductor driver unit: SRM-400S, the successor model of 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 in which FET are installed in all stages.

In addition to the conventional power transformer for the high-voltage circuit, the newly designed power transformer with the winding for the low voltage circuit is installed in SRM-400S. The low-voltage winding improves the power efficiency and achieves further power saving and better sound quality than the conventional driver units (such as SRM-353X).

The new chassis, which is more rigid than the conventional model, is installed. The chassis has a hybrid structure using a lot of non-magnetic aluminum and further reduces the effect of the environmental noise factors such as vibrations. The inputs are RCA and XLR, the mutual exclusion inputs. The custom-made concentric dual volume knob, which is common to STAX products, and RCA PARALLEL OUT functions are installed same as the conventional driver units. All electric components are strictly selected considering the environment. Also, the sound quality and the performance are improved. The complete DC amplifier configuration includes no coupling condensers, one of the biggest traditional features.

SRM-400S takes over the high-resolution sound that is unique to the semiconductor circuit and dynamic low-range sound reproduction. Simultaneously, the good sound balance is further pursued than SRM-353X. From the low range to the high range, the sound of each range is well harmonized. Not only for the combination with the advanced Lambda series, SRM-400S is also ideal for the upgrading from the entry-level SRS-3100. This is the promising new model which covers everyone from beginners to intermediates among the renewed driver unit lineup.

Technical Specifications

Type 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 50kO (RCA), 50kOx 2 (XLR)
Maximum output voltage 400Vrms (1kHz)
Bias voltage DC 580V
Operating temperature / humidity 0 to 35 degrees C / less than 90% (non condensing)
Input terminal RCA x 1, XLR x 1 (mutual exclusion input)
Output RCA parallel output
Power consumption 30W
Dimension 195 (W) x 102 (H) x 376 (D) mm (maximum protruding portion included)
Weight 3.4kg

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