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Dynaco QD-1

Quadaptor (1972)

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Dynaco QD-1


The Dynaco QD-1 Quadaptor serves as a junction box between the outputs of a conventional two channel stereo amplifier or receiver, and four loudspeaker systems; it is a passive device requiring no AC adaptor.

The Quadaptor provides the simple but essential circuitry to recover four separate signal components from two stereo channels utilising the Dynaquad system.

It facilitates accurate electrical balance in the system to attain maximum separation.

It also provides for listening to the front speakers alone as conventional two-channel stereo.


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Reviewed May 30th, 2018 by mail.kenny.russell

Just won an auction on Ebay for one of these and it will be hooked up to a Dynaco SCA-35. Can't wait. Great to have instructions for its correct and intended use. Thanks be to the hifiengine and the one whom submitted the manual.




What a wonderful surprise to find an owner's manual for a 40 year old piece of gear and a schematic as well. I am very happy and excited with HIFI ENGINE.

This website is not affiliated with or sponsored by Dynaco. To purchase QD-1 spares or accessories, please contact the company via their website or visit an authorised retailer.