Stax SRM-400S Solid State Energiser

STAX have introduced a new semiconductor driver unit to the STAX SRM-400S Solid State Energiser, the successor model of the SRM-353X. A custom-made low noise DUAL FET has been installed on First Stage and FET is also installed on Last Stage. The characteristics of left and right FET are carefully paired.

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 within the SRM-400S energiser. The low voltage winding increases power efficiency and achieves improved sound quality..

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 aluminium 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 is improved. The complete DC amplifier configuration that the signal circuit includes no coupling condensers is one of the biggest traditional features.

The STAX SRM-400S Solid State Energiser takes over the high resolution sound which 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 from beginners to intermediates among the renewed driver unit lineup.

Technical 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