HiFiMan Balanced Amplifier Card

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The HiFiMan Balanced Amp Card is an upgrade replacement card for your HiFiMan HM901 and HM901s Media Players.

This upgrade amp card makes your listening experience on the HiFiMan HM901 second to none.


  • Works in balanced mode for earphones & headphones with a 3.5mm TRRS
  • Works in standard mode witha a 3.5mm standard jack.
  • Powerful enough to drive some of the most demanding headphones on the market.

The Balanced Amplifier Module is designed with some of the most expensive and high quality parts on the market today.

It uses (4) OPA627 OP-AMPS and (4) OPA634 buffers which makes the listening experience produced by the HM901 second to none.


Power supply voltage: ±8.2v

Power supply current: ±20ma

Maximum balanced output (30R load)

Low Gain: 2.32v(179mw)

High Gain: 3.91v(477mw)


Frequency response: 20hz-20Khz(-1dB)

Maximum Normal output (30R load)

Low Gain: 1.45v(70mw)

High Gain: 2.5v(200mw)


Frequency response: 20hz-20Khz(-1dB)

Output impedance: 1 Ohm