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Quad 405

2 Critic Reviews

This product is Vintage or Discontinued

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Page last updated Aug 10, 2025

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Description

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Introducing the Quad 405, a power amplifier that has become a staple in live sound and stage settings due to its reliability and performance. Originally designed for professional use, this amplifier offers a robust solution for musicians and audio engineers seeking clarity and power. The Quad 405 employs a current-dumping design that combines Class A and Class B amplifiers' benefits, ensuring efficient power handling with minimal distortion.

This amplifier is perfect for those who demand high-quality sound without the bulkiness commonly associated with heavy-duty audio gear. Its straightforward layout and durable construction make it an ideal choice for touring musicians and venues looking for consistent and clear sound reproduction. The Quad 405 has been revered for its ability to deliver crisp highs and a well-defined bass response, providing a balanced audio experience across various genres and environments.

Whether you're powering a large PA system or enhancing a smaller setup, the Quad 405 is versatile enough to meet the demands of different audio applications. Its longevity and performance have made it a favorite among professionals who value sound precision and durability.

Key Features:

Uses a current-dumping circuit design for high efficiency
Suitable for both small and large venue sound systems
Delivers clear, distortion-free audio
Durable construction ideal for touring musicians
Known for its balanced sound quality across frequencies

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Hifyed

Quad 405/44 &FM3 Review // A TWEAKERS DREAM!

Hifyed

Am Testat Celebrul Amplificator Audio Quad 405- Quad 405 Amplifier

Electronic Mania

Upgrading The Original Quad 405 Power Amp

tweaker man

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Quad 405.

Features and functionality

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The Quad 405 utilizes a current dumping model with a driver stage in class A and an output stage in class B, combining smoothness and efficiency.
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The Quad 405 can be effectively integrated with a Dahlquist DQ-LP1 for setups involving both main speakers and a subwoofer, enhancing versatility.
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Achieves 100 watts per channel with 0.007% THD at 1kHz, showcasing impressive performance metrics even by modern standards.
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Comparisons

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Despite modern advancements, some users prefer the Quad 405 over class D amps, citing less listening fatigue and a more inviting sound.
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User experience

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Long-term owners find the Quad 405 delivers a musical sound quality, effectively powering various speaker models like IMF TLS80 and Dynaudio Evoke 50.
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Mods and upgrades

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Users have successfully upgraded their Quad 405 to a 405-2 model, enhancing its capabilities and performance over time.
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Other

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The Quad 405 can be paired with high-quality phono amps and turntables for an enriched audio experience.
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Setup and maintenance

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Some users recommend using a 4 or 5 pin DIN connector for interfacing, with the option to solder your own using van de Hul silver or gold interconnect cable.
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Use cases and applications

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When paired with AR-2a speakers, the Quad 405 can be part of a robust setup for turntable or PC audio sources.
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Initially popular during the BBC audio heyday, the 405 continues to have a dedicated following among vintage audio enthusiasts.
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Value and pricing

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A complete estate sale purchase including Quad 405, Dahlquist DQ-LP1, and Creek Preamps for $100 is considered a great find by vintage audio enthusiasts.
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Build quality

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The Quad 405 was designed to deliver optimal voltage for Quad electrostatic speakers, highlighting its tailored engineering for specific audio setups.
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Critic Reviews

Quad 405 / 405-2 Power Amplifier Review

liquidaudio.com.au

The Quad 405-2 power amplifier stands out as a classic piece of hi-fi gear, praised for its elegant, minimalist design and smooth, mellow sound profile. Its unique feedforward error correction design offers a clean listening experience free from the harshness typical of many solid-state amplifiers. The amp excels in reliability and serviceability, making it a long-term investment for audiophiles. However, it does fall short in delivering deep bass and sparkle, which might leave some seeking more authoritative sound. Despite this, its affordability and high-quality build make it a genuine bargain. Beware of clones that lack the authentic Quad quality. Overall, the sentiment is positive, especially for those valuing warm, effortless sound over raw power and modern features.

positive

Full Review

Quad 405 Stereo Monitor Amplifier Review

audio-times.com

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Duncan MacKay

Keyboardist, Composer

10cc

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Mentioned in an interview on page 34 of the July 1979 issue of Beat Instrumental.

On the other side of the boards lies a 4 -way crossover distributing the signal into various channels. The bass and low mids go to a Peavey 400W stereo power amp, and the uppers go into two Quad 405s. Quad 405s are actually hi fi amplifiers, and Duncan was so impressed by them on his hi fi that he decided to use them for his keyboards.