Stax – SRM-D50 Driver Unit for Earspeakers



  • Desktop amplifier/DAC for STAX electrostatic headphone with a compact size.
  • ESS ES9018 DAC coupled with TI OPA1642 ultra low distortion op amp to achieve bit correct signal representation.
  • XMOS USB interface supports DSD128 playback and PCM stream with up to 384KHz sample rate.
  • Multiple input selections including optical fiber and coaxial.
  • Amplifier circuitry based on discrete components – heritage from classical STAX amplifier product.
  • Voltage meter dancing with input signal provides an enjoyment more than music.
  • Well selected internal components reflect high quality requirement.
  • Full Aluminium housing with multiple surface processing to achieve velvet feel.
  • Standard STAX 5Pin connector for all STAX headphones.
• Frequency response : DC -40KHz (+0dB, -3dB)
• Rated input level : 130mV (100V output)
• Maximum input level : 30V (minimum volume RCA analog input)
• Gain : 59dB (900 times)
• Harmonic distortion: <0.025% /1KHz-10KHz/ SR-L series
• Input impedance: 20KΩ (RCA input)
• Maximum output voltage:  400Vr.m.s (1130Vp-p)
• Bias voltage:  DC 580V
• Rated power consumption: 35W
• Recommended operating temperature:0-35C,  <90% RH (No condensation)
• Signal input:  USB/Optical / Coaxial digital inputs,  RCA analog input