Quad · Headphone Amplifiers
PA-One+
A valve headphone amp with balanced, RCA, coaxial, optical, and USB inputs.
fig. 01 · headphone amplifiers
PA-One+
From Quad
PA-One+ is a valve headphone amp for listeners using several analogue and digital sources. Its input set covers balanced, RCA, coaxial, optical, and USB connections, with outputs for headphone use and system pairing.
Specifications
| Model | PA-One+ |
|---|---|
| Input Impedance | 50kΩ |
| Output Power | 500mW（@ 32Ω ） |
| Output impedance | 32Ω～300Ω |
| Input Sensitivity | 300mV |
| Frequency response | 20Hz～20kHz (+0dB,-0.5dB) |
| Distortion | 0.5% at 1kHz |
| Channel Balance | ±0.5dB |
| S/N Ratio | 90dB |
| Vacuum tubes | 2x 6SL7, 2x 6SN7 |
| Digital Input Sampling Frequencies | 44.1kHz-192kHz, 384kHz(USB), DSD256(USB） |
| Input Jack | 3-pin balance, 1xRCA, 1xUSB, 1xCOAX, 1xOPT |
| Output Jack | 1xstandard headphone jack ; |
| Size（WxDxH） | 4-pin balance headphone jack; 1xRCA output |
| Net weight | 180mm x 260mm x 170mm |
| Product type | headphone amplifier / preamp |
| Series | PA |