Quad II Forty
Brand: Quad
The Quad II Forty is a high-performance integrated amplifier introduced by the British audio manufacturer, Quad, in the 1980s. Its name refers to its output power, which is around 40 watts per channel into 8 ohms (or 80 watts per channel into 4 ohms).This amplifier is known for its clean and detailed sound, along with being a workhorse that can drive a wide range of loudspeakers. Its design features include a modified Class AB circuit topology, a discrete transistor input stage, and Quad's own proprietary 'Super Regulator' power supply system.The Quad II Forty was considered an innovator in its time, particularly for its input stage and power supply. It also received high praise from audiophiles and reviewers for its sound quality and versatility. Still, Quad discontinued its production in the mid-1980s, making it a sought-after vintage component today.
- Power Output: 40W (mono)
- Frequency Response: 10Hz to 30kHz
- Distortion: 0.3%
- Damping Factor: 20
- Speaker Impedance: 4 to 8Ω
- Input Sensitivity: 1V
- Signal to Noise Ratio: 80dB
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