QES Labs HPBA-2 Owner's Manual - page 3
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5. METERS
The VU meters are analog type, and show actual output level on a 300Ω load.
When the needle is on the 0VU indication, there’s a 1 milliwatt signal going through your
headphones (0.548 Vrms).
6. SPECIFICATIONS
Frequency response, 300Ω load, both channels active:
1.5Hz – 150kHz (+0/-0.5dB)
Input impedance:
20 kΩ
Output impedance:
164 Ω
Total Harmonic Distortion +Noise (THD+N), 300Ω load, both channels active, 1mW output:
0.0026%
C.M.R.R.:
> 80dB
Dynamic range:
> 120dB