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Quad 306 Power Amplifier QUAD 306 Stereo Power Amp 50w@8ohm/70w@4ohm"The Quad 306 is a stereo power amplifier that comes equipped with an RCA input. The efficiency of the Quad stereo power amplifier is expressed by the root mean square value, which at 4 Ohms is x2 70 W and at 8 Ohms is 50 W, whereas the total harmonic distortion is only 0.003%. As far as the performance is concerned, the signal to noise ratio for the Quad 306 stereo amplifier has the value of 105 dB while the output voltage is 220 V and the device falls into the power class A. The input sensitivity of the stereo amplifier is m
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Quad, the venerable British hi-fi brand, traces its origins to 1936 in London, when engineer Peter J. Walker founded S.P. Fidelity Sound Systems, soon renamed the Acoustical Manufacturing Company. Relocating to Huntingdon in 1941 after wartime bombing, the firm shifted from public address gear to domestic audio amid post-war demand for superior sound reproduction. Walker's pioneering ethos—prioritizing "the closest approach to the original sound"—defined Quad from its early QA12 amplifiers, adopted by the BBC, to the iconic Quad I of 1953.
The brand excels in amplifiers and electrostatic loudspeakers, revolutionizing both categories. The Quad II power amplifier of 1953 introduced cathode coupling for vanishingly low distortion, while the 1956 ESL 57 delivered the world's first full-range electrostatic speaker, employing a massless film diaphragm for unparalleled transparency and transient speed. Quad advanced into solid-state with the 1967 303 and transistor designs featuring innovative "Triples" output stages, later expanding to integrated amps like the 99 series, moving-coil speakers, and modern electrostatic models such as the ESL 988 and 989.
Today, under the International Audio Group since 1997, Quad holds a prestigious position in the high-end market, revered by audiophiles for its unyielding pursuit of accuracy over trends. Its heritage components command vintage collector status, yet contemporary offerings maintain a niche boutique appeal among discerning buyers seeking refined, distortion-free reproduction that honors Walker's legacy.
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