SRM-T8000 is Stax’s latest flagship electrostatic headphone amplifier utilizing hybrid technology. It employs two 6922 in the input stage, driving a Class-A solid-state output stage. The vacuum tubes isolated in a separate section made of vibration-proof damper and shield cover to eliminate vibration and noise. The high-capacity large toroidal transformers and selected high-quality parts allow the highest refinement in sound.

● Frequency response: 1Hz – 115kHz / when used with one earspeaker
● Gain: 60dB (x1000)
● Harmonic distortion: 0.01% /1kHz
● Input terminal: LINE1/LINE2 (RCA), LINE3 (XLR), LINE4 (optional input for future)
● Rated input level: 100mV (at 100V output)
● Input impedance: 50kΩ (RCA) / 50kΩx 2 (XLR)
● Maximum output voltage: 470Vrms (1330V p-p)
● Mains voltage: AC120V/60Hz
● Power consumption: 95W
● Operating temperature: 0 to 35 degrees C (less than 90% humidity, non condensing)
● Dimension: 320 (W) x103 (H) x395 (D) mm (protruding portion included)
● Weight: 7.3kg

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

The SRM-T8000 sets a new standard for STAX branded amplifiers, as the company’s finest effort in the space in over 20 years. It boasts a more open, dynamic sound than their SRM-727 or SRM-007t, when paired with their power-hungry SR-009 and SR-007 headphones. The look and feel is classic STAX, and exactly in line with what familiar users would expect.  For those looking to keep with STAX-branded amplifiers only, there is no better choice.