QUAD QII-Forty
The QUAD II-forty power amplifier is much more than a tribute to one of the most famous designs in audio – but refined and powerful in the modern sense of the terms. Although the circuit topology has changed a little from the original, significantly better components and a brand new transformer design have been engineered. While still being delicately balanced a fast, crisp and detailed sound is achieved, whilst producing an output current suitable for modern loudspeakers, including our very own ESL. KT-88 output valves work in a push-pull configuration, while a choice of 4 Ohm or 8 Ohm taps allows for a wide choice of loudspeaker configurations.
| Brand | QUAD |
| Model | QII-Forty |
| Channels | |
| Power per channel, 8 Ω (W) | 40 |
| Power rated from (Hz) | |
| Power rated to (Hz) | |
| Power rated at THD (%) | |
| Power rated with channels driven | |
| Power per channel, 4 Ω (W) | |
| Bridged power, 8 Ω (W) | |
| Frequency response | 10 Hz – 30000 Hz −0.5 dB |
| Total harmonic distortion (%) | 0.3 |
| Signal-to-noise ratio (dB) | |
| Damping factor | 20 |
| Input impedance (Ω) | |
| Gain (dB) | |
| Height (mm) | |
| Width (mm) | |
| Depth (mm) | |
| Weight (kg) |