Stax SRM-252S Direct Coupled Class A Energiser

The SRM-252S is an exclusive driver unit (amplifier) for driving STAX ear speakers with PRO-bias 5 pins. Its line input can directly connect to the audio output terminal of CD player, portable audio player and PC.

SRM-252S has a simple design that excels in sound quality employing the carefully selected newest high-voltage transistors and low-noise FETs. The output stage featuring the emitter-follower configuration reinforces the driving performance and also realized the smooth sound quality. Moreover, the class-A amplification throughout the stages with no coupling capacitors reproduces exhaustively the finest nuance of music.

Although the SRM-252S includes a class-A DC amplifier in a compact CD jacket size case, the internal heat is effectively dissipated through the chassis of aluminium extrusion material to improve the reliability over a long period of time. Also, the parallel output terminal was added to distribute the source signal so that a loud speaker may also be simultaneously used when source equipment has only a pair of output terminals.

Specifications

• Frequency response: DC- 35 kHz (40Vr.m.s. output SR-207, when using one unit)
• Rated input level: 125 mV with 100V output
• Maximum input level: 30 V r.m.s. with volume at minimum setting
• Amplification: 58 dB (x800)
• Total harmonic distortion: max. 0.01% (1 kHz / during 100 V r.m.s. output)
• Input impedance: 50 kΩ (RCA)
• Maximum output voltage: 280 V r.m.s. / 1 kHz
• Standard bias voltage: DC580 V (PRO bias)
• Power consumption: DC12V, 4W/ Exclusive AC adaptor attached For your area
• Temperature range for use: Between 0º and 35ºC, max. 90% (no condensation)
• External dimensions: 132 (W) × 38 (H) × 132 (D) mm (without Knob, Pin jack)
• Weight: 540g

More Information

• Earspeaker Drivers, by STAX Audio