Matrix Audio HPA-3B - Manual (Page 8)

Technical Specification
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Balance Headphone Output
SNR: ＞-114dB A-weighting
THD+N: <0.0003% at 300ohms 135mW 1kHz A-weighting
Frequency Response: 20Hz-20kHz(+0dB/-0.05dB)
Output Impedance: 0.6ohms
Output Power: 3800mW at 33ohms at THD+N=0.01%
1500mW at 300ohms at THD+N=0.01%
800mW at 600ohms at THD+N=0.01%
SE Headphone Output
SNR: ＞-108dB A-weighting
THD+N: <0.0004% at 300ohms 325mW 1kHz A-weighting
Frequency Response: 20Hz-20kHz(+0.03dB/-0.1dB)
Output Impedance: 0.4ohms
Output Power: 2100mW at 33ohms at THD+N=0.01%
430mW at 300ohms at THD+N=0.01%
220mW at 600ohms at THD+N=0.01%