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Pioneer QL-600A

Quadralizer Amplifier (1972-74)

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Pioneer QL-600A


The QL-600A is a regular and SQ Matrix decoder and rear channel amplifier


Power output: 10W/ch into 8Ω (stereo)

Frequency response: 20Hz to 30kHz

Total harmonic distortion: 0.5%

Speaker load impedance: 4Ω to 16Ω

Year: 1973


Related Catalogues

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re: QL-600A

Interesting. I'll be taking a look at that. I figured it was a precursor to surround sound, but this still has me confused. I don't suppose you have a copy of the manual...?

I'm sure I'll have a little better idea how to properly use it after some more research, but nothing will beat the manual.

re: QL-600A

Just got one of these at our church's rummage sale. Does anyone have documentation on it? I'm new to this sort of receiver, and it has me kinda confused...

re: QL-600A

It is not a receiver nor a full amplifier. It's a quadraphonic unit (in a way an early predecessor to surround sound). Quadraphonic amplifiers will play 4 seperate channels of audio over 4 speakers instead of the 2 channels you get from your regular stereo. You set up 2 speakers in front of you and two in the back. The unit you've got is meant to be added to a regular stereo amplifier to add the 2 rear channels you need in order to get 4 channel music playback.
The unit was made to match with a Pioneer SA-7100, SA-8100 or SA-9100.
It also has a decoder to play back SQ vinyl. Normal vinyl has just two tracks/ channels of music (as the groove has only two sides to it) but SQ vinyl has 4 tracks of music encoded. The QL-600A will seperate the 2 rear channels from the front channels in order to give you quadraphonic sound.

There is a lot of content to be found on the internet about quadraphonic sound (might you be interested).

This website is not affiliated with or sponsored by Pioneer. To purchase QL-600A spares or accessories, please contact the company via their website or visit an authorised retailer.