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Balanced Amplifier Card



The Balanced Amplifier Module was 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. By using these high quality chips, the listening experience produced by the HM-901 is second to none.

This design will work in balanced mode for earphones/headphones with a 3.5mm TRRS or in standard mode for earphones/headphones with a 3.5mm standard jack. This powerful amplifier module will drive some of the most demanding headphones on the market.


Adapted Models : HM901s/901U/802U/650/901/802
Power Supply Voltage : ±8.2v
Power Supply Current : ±20 mA
Maximum Balanced Output (30R load) : Low Gain-2.32v(179mw)
Maximum Balanced Output (30R load) : High Gain-3.91v(477mw)
S/N : 112±1dB
Frequency Response : 20Hz-20KHz(-1dB)
Maximum Normal Output (30R load) : Low Gain-1.45v(70mw)
Maximum Normal Output (30R load) : High Gain-2.5v(200mw)
S/N : 109+/-3dB
Frequency Response : 20Hz-20KHz(-1dB)
Output Impedance : 1 Ohm
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