A most unique amplifier of which it is worth noting first of all that the original model, launched in 1967, continues to be admired by Hi-Fi enthusiasts and recording engineers for three reasons: its exceptional reliability, the installation flexibility afforded by its compact dimensions, and its sweet, yet energetic and richly detailed sound.
In keeping with this philosophy, the ground-breaking circuit innovation developed by QUAD's founder, the triple output stage, has been preserved at the heart of the amplifier in the new 303, with the addition of inputs with RCA and XLR connectors. Updated with the best available components and preserving Class AB operation, the novel "triple symmetrical" design employed is faithful in its basic conception to the original, resulting in a fully balanced output stage and making the quiescent current independent of the temperature of the power transistors.
Furthermore, distortion is reduced to decidedly low levels without sacrificing stability, and this performance is maintained whatever the dynamic conditions. A significant increase in output power is accompanied by a significant increase in current delivery capability, thanks to the use of a 200 VA low-noise toroidal power transformer, and the package is completed with the possibility of a mono configuration to use two 303s in a system requiring more power.
Features:
- Stereo power amplifier with an exceptional price/performance ratio.
- Updated version of the 303 model marketed in 1967.
- Designed and developed in the UK.
- Aesthetics and basic design faithful to the original model.
- Fully balanced "symmetrical triples" Class AB output stage.
- Executed with high quality components.
- 200 VA low noise toroidal transformer power supply.
- Bridgeable in mono.
- Balanced (XLR) and unbalanced (RCA) inputs.
- Stereo output power: 2x50 W RMS/8 ohms or 2x70 W RMS/4 ohms.
- Mono output power: 140 W RMS/8 ohms or 170 W RMS/4 ohms.
- Frequency response 20-20,000 Hz, +/-0.3 dB.
- Input sensitivity: 700 mV unbalanced and 1.5 V RMS balanced.
- Signal-to-noise ratio: greater than 108 dB.
- Dimensions: 12 x 17.6 x 32.5 cm (W x H x D).
- Weight: 8' 4 kg.
