Overview: The Quad PA-One is a combination headphone amp, D/A converter, and
preamplifier. The PA-One is equipped with five vacuum tubes (or "valves", as the
British call them) to give you the most lifelike sound possible. It has both
analog and digital inputs, two 1/4" headphone outputs, and an RCA preout.
The PA-One is housed in a sturdy steel chassis with a Lancaster Grey finish.
Design: The PA-One's classic design is based on Quad's benchmark Quad
II valve amplifier from 1936. Engineers have carefully selected two 6SL7, two
6SN7, and one EZ81 high-amplification vacuum tubes to deliver its trademark high
fidelity sound. Tube amplifiers require a "warm up" period of at least 15
minutes prior to use for best sound quality, and to prevent damage to your
equipment. Also, an extended "burn-in" period of at least four hours, and
preferably, twelve hours, is highly recommended before you first use it. More
information on warm-up and burn-in can be found in the included Owner's Manual.
Digital-to-Analog Converter: The PA-One features a USB DAC
to allow you to listen to your favorite digital music sources from a computer or
laptop via USB. It is USB 1.1 and 2.0 compliant, and is compatible with both
Windows and Mac. A 5' USB cable with gold-plated USB-A and USB-B connectors is
included. The DAC supports sampling frequencies from 35kHz to 192kHz. You can
also connect your other digital components to the PA-One via optical or coaxial
Connections: The Quad PA-One offers two headphone outputs
and a variety of analog and digital
- Headphone Outputs: two 1/4" jacks (front panel)
- Line Input: pair of gold-plated RCA jacks
- Balanced Input: pair of left and right XLR jacks
- Digital Inputs:
- USB: Type B USB
- Coaxial: single RCA jack
- Optical: Toslink optical input
Controls: The PA-One has a large rotary volume knob on the front panel
with a balance control just below. Source selection consists of three push
buttons for the Line Input (RCA), Balanced (XLR), or Digital inputs. The Digital
Input button allows you to cycle through for selecting the USB, coax, or optical
sources. A 2-way Impedance Selection switch lets you toggle between low and high
impedance headphones. The main power switch is located on the back panel.
- Frequency Response: 15Hz - 30kHz (+0.5dB, -0.5dB)
- Input Impedance: 50kΩ
- Input Sensitivity: 300mV (500mW @ 32Ω
- Output Impedance: 32Ω - 300Ω
- Output Power: 500mW @ 32Ω
- Digital Resolution: 44.1kHz, 48kHz, 88.2kHz, 96kHz,
- Channel Balance: +/- 0.5dB
- Distortion: 0.5% @ 1 kHz
- Signal-to-Noise Ratio: 105dB
- Dimensions: 7.06" width, 6.5" height, 11.43" (13.375"
including power cord)
- Weight: 16.53 pounds
Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.