Quad 303 Power Amplifier (2024 Edition)
Evolution of the QUAD 303
Every aspect of the QUAD 303 Power Amplifier has been re-engineered beyond a simple update of components. Originally designed for domestic use, it also became a favourite in broadcasting and recording studios for its reliability. The new model surpasses the original's standards while maintaining its ethos, with modern design and functionality that reflect its enduring appeal, even earning a place at the Museum of Modern Art.
Technological Advancements
The QUAD 303 stays faithful to its roots with QUAD's ‘symmetrical triples’, ensuring low distortion and stable performance under dynamic conditions. This advancement means distortion levels are now almost negligible, far below what is detectable by the human ear. The ‘triples’ design also protects the output transistors, enhancing reliability without complex circuitry.
Complementary Output Stage
Unlike the original’s quasi-complementary stage, the new QUAD 303 employs a fully complementary output stage, using premium transistors for better linearity and stability under challenging conditions. With this, the amplifier handles overdriven or disconnected speaker scenarios effortlessly, maintaining excellent sound quality and reliability.
Modern Features and Power Output
The new QUAD 303 incorporates a custom low-noise toroidal transformer and advanced feedback topology for thermal stability and dynamic power delivery. Rated at 50W @ 8 ohms, it handles modern audiophile demands and drives even the most challenging speakers with ease. The amplifier's design remains iconic, with durable materials and rugged construction that offer both style and substance.
QUAD's Legacy and Modern Excellence
By revisiting the QUAD 33 and 303 components, QUAD reaffirms its longstanding legacy in the British hi-fi industry, blending authenticity, pedigree, and innovation. This new iteration pays homage to QUAD’s past while showcasing its excellence in modern audio engineering. The QUAD team involved in this project possesses nearly 200 years of combined engineering experience and over 100 years dedicated to QUAD’s unique designs and service, further reinforcing the brand's enduring commitment to quality.
The Team Behind the Innovation
The development of the new QUAD 33 and 303 was overseen by a team of experts, including Rob Flain and Paul McConville, two of the most experienced QUAD service engineers. Jan Ertner, with three decades of QUAD design expertise, Peter Comeau, the mastermind behind some of QUAD’s most successful loudspeakers, and David McNeill, who has been at the forefront of QUAD’s innovations for two decades, all played key roles. Together, they ensured that the new products could uphold the legacy of the iconic 33 and 303.
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 |
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