Matrix Audio HPA-3U - Manual (Page 12)

Technical Specification
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Line Output
SNR: ＞-112dB A-weighting
THD+N: <0.0003% at 1kHz 1VRMS A-weighting
Frequency Response: 20Hz-20kHz(+0.01dB/-0.04dB)
Out Impedance: 51ohms
Headphone Output
SNR: ＞-112dB A-weighting
THD+N: <0.0003% at 33ohms 90mW 1kHz A-weighting
Frequency Response: 20Hz-20kHz(+0.01dB/-0.04dB)
Output Impedance: 0.2ohms
Output power: 2800mW at 33ohms at THD+N=0.01%
420mW at 300ohms at THD+N=0.01%
210mW at 600ohms at THD+N=0.01%
Gain Control
5=5dB 10=10dB 20=20dB