Name: Quad 303 Power Amplifier
Brand: Quad
SKU: Q-303
Price: 2799.99 AUD
Availability: InStock

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ONE FOR THE HISTORY BOOKS

Quad 303’s legendary performance and distinct design have earned it a lasting place in Hi-Fi history, becoming an icon recognised by audiophiles across generations. Today’s 303 carries on that legacy. The same dedication to design. The same striking looks. Now crafted for the contemporary listener.

QUAD 303 POWER AMPLIFIER

Quad 303 is a 50W Class AB power amplifier sporting a custom 200VA toroidal transformer, Quad’s iconic 303 triples output stage, 10 ampere into difficult loads, and bridge mode selection for dual mono setups – all encased in Quad’s iconic anodised chassis with CNC-routed heat sinks.

THE POWER OF TRIPLES

Quad’s famed ‘symmetrical triples’ substantially minimise signal irregularities and temperature fluctuations that introduce noise into performance. By dropping the noise floor and increasing clarity, Quad 303 reveals the distinct timbre of individual instruments within the soundstage, their articulation and sustain, creating a three-dimensionality and texture to your listening sessions.

SWAGGER. MUSCLE. SHOWMANSHIP

A brand new 200VA, custom specified low-noise toroidal transformer, designed specifically for Quad 303, is the ultimate strongman. Compact and cool-running, 303s class AB power supply is entirely free from discrepancies caused by overheating and asymmetrical signals, delivering rich sonic detail with vice-like grip.

QUAD 33 DREAM TEAM

- Peter Comeau: famed acoustic director for Quad, Wharfedale, Mission & Leak.
- Rob Flain & Paul McConville: world’s most experienced Quad service engineers.
- Jan Ertner: 30yrs of Quad acoustic design.
- David McNeil: 20yrs of Quad industrial design.

Sure, the USA had Jordan, Pippin, Johnson, Bird, and Barkley. But over 200 years of combined experience have donned Quad’s iconic jersey numbers 33 & 303, taking to the court to produce a once in a generation moment of magic.

THE POWER TO INTOXICATE

Front and back CNC-routed heated sinks book end an anodised silver chassis that is the epitome of mid century industrial design. Combined with exposed fastenings, embossed Quad logo, and its orange incandescent power switch, Quad 303 proves that power truly is seductive.

PERFORMANCE FINESS BEFORE UNRULY POWER

50w @ 8Ω (70w @ 4Ω) might sound conservative. But 303s honest power output, with a maximum current delivery of 10A into difficult loads, is ideally suited to the demanding requirements of modern, audiophile loudspeakers, driving even Quad’s electrostatic designs with ease.

THE FOREMAN OF HIGH FIDELITY

Output signals are cleverly monitored against input signals, through intelligent feedback topology, to check and correct discrepancies (distortion). In addition, 303s topology automatically adjusts transistor current flow regardless of temperature, so that you get exceptional audio clarity, even over long listening periods at high temperatures.

MORE POWER. MORE POSSIBILITIES

Native ‘Bridge Mode’ functionality allows dual 303s to be configured as a dual mono system, almost tripling its original 50W power output to 140W (@ 8Ω). Such flexibility ensures that Quad 33 & 303 will continue to unlock greater performance possibilities that keep pace with your growing aspirations, whatever they become.

NOTHING LOST IN TRANSLATION

Premium speaker binding posts, single-ended RCA and balanced XLR inputs, plus a 12V trigger input for automatic power control complete 303s connectivity options, giving you the highest possible quality connections so that nothing is lost in translation.

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Quad 303 Power Amplifier

Technical specifications

Design Philosophy / 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
Ouputs	1 x 12V Trigger 1 x Stereo Speaker, 1 x 12V Trigger (link)
Power Amplifier Section
Gain	+29dB
Rate Power Output	Stereo: 2 x 50W (8ohms, THD<1%) Stereo: 2 x 70W (4ohms, THD<1%) Bridged: 140W (8ohms, THD<1%) Bridged: 170W (4ohms, THD<1%)
Frequency Response	20Hz - 20kHz (+/-0.3dB)
Total Harmonic Distortion	<0.002% (1kHz)
Input Impedance	10k ohms
Input Sensitivity	700mVrms (Line) 1.5Vrms (XLR)
Signal-to-Noise-Ration (S/N)	>108dB (A - weighted)
Max. Output Current	10A
General
Net Weight	8.4kg
Dimensions (W x H x D)	325 x 176 x 120mm
Finish	Classic QUAD Grey