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What is the output impedance for the headphone output?
Input SPIF×1 Coaxial*1 USB（1.0）×1 Analog RCA *1
Output Analog RCA*1 6.5mm headphone*1
Frequency 20HZ---20KHZ (+/-0.5dB)
THD + N <0.00227% (-92.8dB)@20khz Unweight
Headphone output 0.05%
Input choose USB/SPDIF ×1 Analog/ digital ×1
Headphone output P－PMAX：10V
Headphone output impedance : 32 ohm---600 ohm
Line output 2Vrms
Power input DC12－18V 500mA
Size （chassis ） 135*51*170 (mm)
You do realize that nothing listed in your reply actually states the output impedance, but rather more of supported headphone impedance, right? I mean, if it really had an output impedance of 32 to 600 ohm, I wouldn't even bother with such absurd impedance.
I’m curious about this as well (5 years later), as running a pair of Grado Sr80e does sound pretty bright through this amp. That recommended impedance range for headphones of 32-600 would suggest that the actual output impedance is not nominal (less than 1 ohm). I’d bet it’s in the 4 ohm range, as I believe recommended headphone impedance matching is generally considered to be at least 8x output impedance. So the recommended minimum headphone impedance for a 10ohm output would be ~ 80 ohms. Lots of studio monitors like AKGs won’t show any frequency response anomalies, but low impedance IEMs probably would. I think my Grados are around 30ohms, and they are bright sounding anyway. But the impedance matching may not be helping.