EarMen ST-Amp Balanced Desktop Headphone Amplifier

Fully Balanced Desktop DAC / Headphone Amp / Preamp

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Desktop Fully Balanced DAC / Headphone Amp / Preamp

EarMen ST-Amp is a Fully Balanced Desktop Headphone Amplifier with the Pre Amp option and integrated DAC. It has extraordinary sound, whether you use the high quality internal ESS DAC or an external DAC of your choice. Despite high power output, the amplifier was carefully designed for headphones, and delivers clean audio with low distortion and no unpleasant clicks or pops when operating the unit.

Fully Balanced Design

The ST-Amp employs a fully balanced design, delivering clean audio from the balanced 4.4mm output. The ST-Amp also features an advanced topology for SE signals, with many of the benefits of the balanced connection with almost no phase shift, additional noise or THD.

The headphone outputs are powered by two TPA6120 operational amplifiers, a proven high performance option in modern headphone amplifier deisgns. To make the experience complete, the ST-Amp features a high-quality balanced ALPS potentiometer.

Pre-Output Option

On the back panel of the device we have SE and BAL Pre-Out outputs. This option allows the user to use the ST-Amp as a DAC and preamplifier for a much more powerful system.

Power Supply

At the heart of the device itself is a noiseless linear power supply with great stability, so it can easily provide enough power even for the most demanding headphones. Apart from the special topology of the amplifier, the power supply itself demonstrates excellent characteristics even at full power.

  • Simple, easy to use design
  • Integrated DAC
  • Output power up to 1.85W
  • Fully balanced architecture
  • Ultra low THD and SNR
  • Aluminum chassis
  • Compact design
  • Pre Out Option
  • Earmen ST-Amp
  • Please note: power cable and USB cable are NOT included

Inputs and outputs

Inputs RCA Single End Input
  Balanced 4.4 mm Input
Outputs SE 6.35mm
  Balanced 4.4mm
Pre Outputs RCA (SE output)


Digital Specifications

DAC ES9280
Audio formats  
DSD 64 / 128 DoP
DXD 384/352.5 kHz
PCM Up to 384 kHz


Headphone Amplifier Specifications (Single Ended)

  SE in -SE out SE in - BAL out
Input 2V 2V
Output 4V-0.5W@32 Ohm 7.75V-1.85W@32Ohm
THD+N 0.0025% 0.003%
SNR [A-W] >117dB  >121dB
Dynamic range >117,9dB  >121dB 
Freq. response ±0.003dB ±0.007dB


Headphone Amplifier Specifications (Balanced)

  BAL in - SE out BAL in - BAL out
Input 4V 4V
Output 4V-0.5W@32 Ohm 7.75V-1.85W@32Ohm
THD+N 0.0025% 0.002%
SNR [A-W] >118dB  >125dB
Dynamic range >118dB  >126dB 
Freq. response ±0.003dB ±0.006dB


Dimensions and Weight

Dimensions  170x30x150 mm / 6,69"x1,18"x5,90"
Weight 1100 gr / 2,42lbs

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