STAX Japan introduce the SRM-D10, the world’s first compact DAC / electrostatic amp unit. High-performance DAC for PC / Mac and variety of digital audio sources, from the desktop part of the amplifier can be adapted STAX mainstream electrostatic earspeakers. Now you can take the SRM-D10 to your home, office, or out door and enjoy the superb sound from STAX anytime, and anywhere you go.

Portable amplifier for STAX electrostatic earspeaker with built-in Lithium Ion rechargeable battery pack.

Full machined aluminium case.

XMOS USB interface supports DSD 5.6MHz signal playback and PCM audio with up to 384KHz sample rate. High voltage amplifier for perfect high frequency response.

Well-selected internal components reflect high quality requirements.

Standard STAX 5-Pin connector for all STAX earspeakers.

Wide range switching power supply provides flexible power handling capability.

●Frequency response:20Hz – 40KHz (+0dB,-3dB)
●Rated input level:230mV (100V output)
●Maximum input level:10V (minimum volume in analog input)
●Gain:53dB (450 times)
●Harmonic distortion:0.025% / 1KHz-10KHz
●Input impedance:10 KΩ(analog input)
●Maximum output voltage: 200Vr.m.s / 100Hz-10KHz
●Bias voltage:DC 580V
●Supply voltage:DC 14V
●Battery Operating time:4.5hour(analog input) / 3.5hour(digital input)
●Power consumption:6.4W (USB input)、5W (analog input)
●Recommended operating temperature: 0-35°C, <90% RH (No condensation)
●Signal input:MicroUSB digital input, 3.5mm analog input
●Net weight: 450g

About Stax Headphones

Stax produce exclusively electrostatic headphones, or “earspeakers” as they call them, in Japan, since 1938.  Stax chose the electrostatic technology for its ability to produce transparent sound, and low weight for comfort/ergonomics, both due to the driver design not employing fixed magnets and moving coils, as opposed to other common headphone driver designs. The minimal weight of the driver ensures a very quick response to the signal, creating a more faithful sound reproduction.

The electrostatic driver creates sound when it is powered by static charge (bias voltage), which reacts to a high voltage signal field created around the driver element by the stators. For this reason, all electrostatic headphones require special amplification to supply the high voltage (DC) bias, and high voltage (AC) audio signal. In the case of modern Stax headphones, that DC bias is 580V. Stax manufactures a number of dedicated amplifiers for their headphones, ranging from a relatively small portable model, SRM-D10, to their flagship SRM-T8000.

Our Take

Finally a portable solution for driving Stax headphones!  The SRM-D10 delivers a surprising punch for its’ diminutive size, driving the modern Stax headphone lineup to reasonably high listening levels in typical conditions.  With a 3.5-4.5 hour battery life, and the open nature of Stax headphones, it makes for more of a transportable rig, but for those who want to enjoy their electrostatic headphones when they travel, there is nothing else like it! The SRM-D10 drives the SR-L300 through L700 series quite well and does surprisingly well with the SR009 series for being a small portable amp. The SR007 and MrSpeakers Voce definitely push the limits of this amp’s voltage output.