In listing the names involved in the development of this stunning iteration of an icon, you’ll find a calculation of close to 200 years of engineering experience and 100+ years of QUAD-exclusive design and service.
Function
The outstanding performance of the QUAD 303 is still celebrated to this day, and is largely due to the unique output circuit developed by QUAD. In reissuing the QUAD 303 power amplifier concept, exactly like the matching 33 preamplifer, QUAD’s incomparably experienced service team was matched with the equally adept engineering team to reinvoke the design, romance and performance in a thoroughly modern iteration of a hi-fi legend.
As with the new QUAD 33, every aspect of design and performance has been analysed and re-engineered way beyond simply modernising components and refreshing of specifications.
Circuitry
However, much like the original, the new QUAD 303 maintains its faithfulness to the original by employing the famous QUAD ‘symmetrical triples’. Employed to provide a completely symmetrical output stage, greatly reducing distortion and rendering the resting current independent of output transistor temperature. This development enables the designers to reduce distortion to emphatically low levels without sacrificing stability and to maintain this excellence under all dynamic conditions. To put this in perspective, the lowest theoretical distortion present on the very source material will still be some hundred times greater than that the QUAD 303!
Always respected for its conservative but consistent power-output, the classic QUAD 303 was officially rated at 45W @ 8 ohms. A modest but honest output, the 303’s venerability is in the finesse of the performance, not just the raw power. The new model is thoroughly the same.
However, with some tweaking and enhancements, the 303 is loaded with a little extra power – offering 50W @ ohms (70W @ 4 ohms) with a maximum current delivery of 10A into difficult loads. The original 303 was known to have issues with lower impedance loads, the new 303 has no such trouble. Perfectly suited to the more demanding requirements of the modern audiophile, it ensures any speakers – even including QUAD’s electrostatic designs – can be driven with ease. Connectivity options comprise single-ended RCA and balanced XLR inputs, a 12V trigger input and high-quality speaker binding posts. Simple, solid and thoroughly authentic, inside and out. The power output for 'bridged mode' (for use as a mono-block power amplifier) reaches 140W @ 8 ohms or 170W @ 4 ohms (bridged mono).
Specifications
| Model | QUAD 303 |
| General Description | Power Amplifier |
| Design Philosophy and Core Technology | Class AB Power Amplifier QUAD 303 Triples Output Stage Custom 200VA Toroidal Transformer Stereo/Bridge mode selection |
| Inputs | 1 x Line, 1 x XLR |
| Outputs | 1 x 12V Trigger 1 x Stereo Speaker, 1 x 12V Trigger (Link) |
| Power Amplifier Section | |
| Gain | +29dB |
| Rated Power Output | Stereo: 2 x 50W (8 ohms, THD<1%) Stereo: 2 x 70W (4 ohms, THD<1%) Bridged: 140W (8 ohms, THD<1%) Bridged: 170W (4 ohms, THD<1%) |
| Frequency Response | 20Hz - 20kHz (+/-0.3dB) |
| Total Harmonic Distortion (THD) | <0.002% (1kHz) |
| Input Impedance | 10k ohms |
| Input Sensitivity | 700mVrms (Line) 1.5Vrms (XLR) |
| Signal-to-Noise Ratio (S/N) | > 108dB (A - weighted) |
| Max. Output Current | 10A |
| General | |
| Standby Power Consumption | <0.5W |
| Net Weight | 8.4kg |
| Gross Weight | 9.5kg |
| Dimensions (mm) (W x H x D) | 325 X 176 X 120 |
| Carton Size (mm) (W x H x D) | 462 X 312 X 226 |
| Finish | Classic QUAD Grey |
| Power Requirements (depending on region) | 220 - 240V - 50 / 60Hz 100 - 120V - 50 / 60Hz |
| Standard accessories | Power Cord, Remote Control, User Manual |
Thank you for considering Yorkshire AV for your next investment in your AV or HiFi setup.
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