“It is so much better in terms of high fidelity, in its purest sense. It reminded me how Quad retain an almost unique grip on the concept.”

– Noel Keywood, Hi-Fi World

The Quad

QC-twentyfour

Unlike the power amplifiers, the Quad Control unit utilises a completely new circuit design. Once again, the circuit is simple in concept yet remarkable in execution. Our designers scoured the globe for the very finest components, with possibly the best example of this being the new ‘old stock’ 6111WA double triode.

Designed as a special military valve, it is hard wired to the circuit and has an estimated life of nearly 100,000 hours. Together with transformers designed by one of the World’s leading authorities and relay input switching, the musical signal is preserved in its purest form - pursuant to the philosophy of the theoretical perfect amplifier which, as Peter Walker himself stated, is ‘a straight wire with gain’.

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QUAD QUAD II-FORTY manual QC-twentyfour
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QUAD II-FORTY specifications

The QUAD QUAD II-Forty is a standout integrated amplifier designed for audiophiles seeking premium sound quality without compromising on technology and features. This amplifier exemplifies QUAD's commitment to delivering high-fidelity audio, rooted in decades of engineering excellence.

One of the primary features of the QUAD II-Forty is its Class AB amplifier topology. This innovative design combines the efficiency of Class B with the linearity of Class A, resulting in a robust power output of 40 watts per channel. This ensures rich, detailed sound reproduction across various volumes, making it suitable for both quiet listening sessions and larger gatherings.

The QUAD II-Forty incorporates advanced circuitry, utilizing low negative feedback to maintain audio clarity and prevent distortion. The amplifier is equipped with an ultra-low output impedance that enhances damping factor. This characteristic allows it to drive a variety of speakers with precision, providing tight, controlled bass as well as a lush midrange and sparkling highs.

Integrated within the QUAD II-Forty are innovative technologies such as the enhanced power supply system, which utilizes oversized transformers for improved dynamic response. This results in better transient response, allowing the amplifier to react swiftly to sudden changes in musical content, enhancing the overall listening experience.

Moreover, the QUAD II-Forty features multiple input options, including RCA and XLR connectors, making it versatile enough to accommodate different audio sources, from CD players to vinyl turntables and digital streaming devices. The inclusion of a high-quality phono stage adds further value, allowing users to connect their turntables directly without the need for additional preamps.

The aesthetic design of the QUAD II-Forty also deserves mention. Its classic styling, characterized by a sleek, understated chassis and elegantly placed controls, ensures that it not only performs beautifully but also complements any audio setup.

In summary, the QUAD II-Forty is a remarkable integrated amplifier that embodies QUAD's rich heritage of audio engineering. With its powerful Class AB output, advanced circuitry, versatile connectivity, and elegant design, it is a superb choice for anyone looking to enhance their audio experience. Whether used in a modest home setup or a dedicated listening room, the QUAD II-Forty promises to deliver an unparalleled listening experience that will satisfy even the most discerning audiophiles.
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