Quad 303

QUAD 303 Amplifier – Power and Precision in Iconic Design

The QUAD 303 is a modern reinterpretation of the iconic Class AB stereo power amplifier launched in 1967. This model retains the characteristic QUAD industrial design, reproducing the aesthetics of its predecessor, but enhanced by an orange LED backlit standby button. Compact and powerful, the QUAD 303 is the ideal partner for the QUAD 33 preamplifier, offering a very high level of audio performance with the ability to drive even difficult loads, making it perfect for the needs of modern enthusiasts.

Technical Characteristics QUAD 303

• High Output Power: Delivers 50W per channel into 8 Ohms and 70W into 4 Ohms, with a maximum current output of 10 Amps, ensuring stability even on demanding speakers.
• Mono Mode Setup: Supports mono bridge configuration, reaching 140W into 8 Ohm and 170W into 4 Ohm, ideal for high power audio systems.
• Proprietary Symmetrical Triples Circuit: The QUAD 303 integrates the exclusive Symmetrical Triples circuit, which maintains perfect symmetry in the output stage and reduces distortion to a minimum. This innovative system ensures that the transistors work within the optimal parameters, improving reliability and sonic performance even in dynamic conditions.

Performance and Thermal Stability

• Advanced Linearity and Thermal Stability: The advanced output stage offers excellent linearity and outstanding thermal stability, preserving the tonal quality and dynamics of the sound.
• Custom Toroidal Transformer: The amplifier is powered by a custom made 200VA ultra-low noise toroidal transformer, ensuring constant, clean power.
• Overload Protection: The protection circuit prevents damage from overload and short circuit, making it durable and reliable even in heavy use situations.

Connectivity and Design

• Audiophile Quality Inputs and Outputs: The QUAD 303 features balanced XLR and unbalanced RCA inputs, and two 12V trigger ports (In/Link) for easy integration with other devices.
• Anti-Vibration Design with Aluminum Heatsinks: The rigid, anti-vibration chassis features double-sided anodized aluminum heat sinks, machined with CNC machines to ensure optimal heat dispersion.
• Classic Aesthetics with QUAD Grey Finish: The Classic QUAD Grey finish echoes the iconic style of the original, combining vintage charm with a solid, contemporary structure.

Performance Specifications

• Linear Frequency Response: With a frequency response of 20 Hz to 20 kHz (+/-0,2 dB) and a total harmonic distortion (THD) of less than 0,002%, the QUAD 303 delivers detailed and balanced sound.
• Optimal Signal to Noise Ratio: Over 108dB (S/N Ratio, A-weighted), ensures a clear listening experience without unwanted background noise.

Dimensions and weight

• Compact and Robust: With dimensions of 120 x 176 x 325 mm and a weight of 8,4 kg, the QUAD 303 is easy to position without compromising on build quality.

The QUAD 303 is a power amplifier that combines tradition and innovation, offering exceptional performance for a faithful and passionate sound.