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Quad PA-1 Headphone amp

Specifications
Input Impedance 50k
Output Power 500mW at 32
Output Impedance 32  – 300
Impedance Modes High / Low
Input Sensitivity 300mV (500mW at 32 )
Frequency Response 15Hz – 30Hz (+0.5dB, 0.5dB)
Distortion 0.5% at 1kHz
Channel Balance +0.5% at 1 kHz
S/N Ration (ref. 500mW) 105dB (IHF-A)
Inputs 2 x Balanced XLR, RCA Phono, Coaxial, Optical & USB
Outputs 2 x 6.3mm Jack headphone socket, RCA Phono
Digital Resolution 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176kHz, 192kHz
Valves 2 x 66SL7, 2 x 6SN7, 1 x EZ81
Size (W x D x H) 180mm x 284.5mm x 163.5mm
Net Weight 7.5kg