Optonica SM-7100HB performance report

Click for full size. A generally well-performing amplifier, it almost matches the Yamaha AX-590 as the lowest-noise power amp stage I’ve ever tested – though it has some hum issues. The headphone output is completely awful for some reason, very hummy.

Note that this unit has been modified considerably. An original model will have about 10 dB higher noise floor and a bit more distortion, as well as a lower damping factor.

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