hifi engine

Manual Library / Quad

Quad 405

Stereo Power Amplifier (1978-84)

add a review (2 reviews)

Quad 405

Description

The Quad 405 is a two channel power amplifier designed for domestic and professional use employing current dumping which eliminates many transistor problems.

The amplifier can be used with the 33 control unit or similar high quality pre-amplifier.

The high power output makes it suitable for use with many of today's high quality loudspeakers and provides opportunity for farther loudspeaker engineering development with less emphasis on efficiency.

The external design continues the Quad tradition of practical simplicity which has won prizes and worldwide acclaim on previous models.

A combination of mouldings and extrusions is used to produce a unit which is strong and pleasing both to the eye and the touch.

Not all loudspeakers can safely accept the full output power of the Quad 405, and the amplifier is provided with a power limiter which is fitted internally for use in such cases.

The Quad electrostatic loudspeaker can be used safely with the power limiter in.

Specifications

  • Power output: 100 watts per channel into 8Ω (stereo)

    Frequency response: 20Hz to 20kHz

    Total harmonic distortion: 0.05%

    Input sensitivity: 0.5V

    Signal to noise ratio: 95dB

    Speaker load impedance: 4Ω to 16Ω

    Dimensions: 115 x 340.5 x 195mm

    Weight: 9kg

  • Power output: 100 watts per channel into 8Ω (stereo)

    Frequency response: 20Hz to 20kHz

    Total harmonic distortion: 0.05%

    Input sensitivity: 0.5V

    Signal to noise ratio: 96dB

    Speaker load impedance: 4Ω to 16Ω

    Dimensions: 115 x 340.5 x 195mm

    Weight: 9kg

Downloads

-2 instruction/owners manual   English -

-2 flyer   English -

instruction/owners manual   English - Quadmann

brochure   English -

flyer   English -

test reports   English - FidelityResearch

service data   English - fmmech

Related Catalogues

The First 50 Years

Products

If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.

If you have additional documentation please consider donating a copy to our free archive.

Reviews

 Login or register to post reviews

rating
Reviewed Mar 30th, 2014 by fumancheese

The best amp ever. With Keith Snook mod is unbeatable!

rating
Reviewed May 06th, 2012 by hermespan

Great potential with upgrading options to world class power amplifier with a small investment in the quad 405mk3 circuit board and inserting new wiring, terminals + the opamp from Burr Brown.

 

Comments

ebillthekid's picture

re: 405 MkII upgrades

Hey all,

Always been very happy with my Quad, but realise that now is the time to upgrade it- what with all the mods online. Thanks to Fumancheese and Hermespan (careful how you sayl that one!) for their comments aboove.
So, I am looking at Keith Snook's & Bernd's/Dada's upgrades, but also Nick DeSmith's, which appear to be further reaching.
In fact, I'm convinced DeSmiths must be far and away the best of all of them. http://www.desmith.net/NMdS/Electronics/QUAD_upgrades.html

Has anyone done these mods please?
Any other mod tips or experiences also welcomed, esp. Quad 44 too.
ALSO, anyone got good experience of budget DACs, eg. Dacmagic 100 or Plus, iR-Dac etc?
(Assuming they may be better than the old 24-bit DAC in my Pioneer CD below, which is a bit light on bass).

Thanks guys,
Will Childs

Devon, GB

Garrard-401, SME 3009-S2i, Goldring 900IGC (VDH-1), Pioneer PDS707, Quad 44, Quad 405-II, Tannoy Eaton

This website is not affiliated with or sponsored by Quad. To purchase 405/405-2 spares or accessories, please contact the company via their website or visit an authorised retailer.