Stax D50 Energizer
Stax D50 Energizer
Stax D50 Energizer

SRM-D50 Energizer

The SRM-D50 is the first desktop Stax energizer to incorporate an in-built DAC for digital sources.

2 Years




The SRM-D50 is a high-performance electrostatic driver and Digital-to-Analog Converter, inspired by the battery-powered SRM-D10. With an elegant all-in-one design, the D50 creates a simple solution for any music lovers to experience the legendary sound of Stax earspeakers.

The aforementioned DAC is a ESS ES9018 DAC coupled with TI OPA1642 ultra low distortion op amp to achieve bit correct signal representation. The D50 also features an XMOS USB interface supports DSD128 playback and PCM stream with up to 384KHz sample rate.

A very versatile energize, the D50 has Multiple input selections including optical fibre and coaxial. The Amplifier circuitry is based on discrete components – heritage from classical STAX amplifier product.

The D50 has a retro feel and look with a voltage meter dancing with input signal provides an enjoyment more than music. Full Aluminium housing with multiple surface processing to achieve velvet feel.

It uses the standard STAX 5Pin connector for all STAX headphones.

Please note that this device can only drive STAX’s electrostatic earspeakers

Frequency response
20Hz – 40kHz (+/-3dB)

Rated Input Level
130mV r.m.s

Maximum Input Level
30V/ RCA, at minimum volume

Maximum Output Voltage
400V RMS (1130Vp-p)

59 dB

Harmonic distortion
0.025% or less/1kHz-10kHz /When use with SR-L series

Input Impedance
20kΩ (RCA)

Bias Voltage
DC 580V

Digital Input
USB (type B) ×1、TOSLINK Optical ×1、COAX RCA ×1

Analogue input
RCA ×1

Power Consumption

Operating temperature
0 to 35 degrees (Celsius) (less than 90% humidity, non condensing)

7.55(W) x 2.63(H) x 10.55(D) inches, 192(W)×67(H)×268(D) mm

9.9 lbs / 4.5 kg