Pinterest Pic Page

Hello herd. How are you folks doing? Grooving on the groovy quad tunes? For a quad format that died out so long ago it is impressive how many folks still enjoy using that now nearly ancient equipment to make a far-out sound-field for audio enjoyment. It is helpful that the matrix quad decoders can create a surround sound by synthesizing a stereo input.

To assist this blog in sharing information about quad I created a Pinterest page showing pictures related to quad. Taken from many different sites the pics can act as a link to sites where the pic is located and that may have other pics and written information you find interesting.

Click on the link below and check it out. It’s groovy!!!

Quadraphonic Surround of the 1970s

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CD-4

CD-4

This is the “odd man out” in the quad world. Extremely ‘fine’ grooves were etched onto the vinyl record to provide frequencies between 35,000 and 50,000 hertz. The CD-4 demodulator sensed these high frequencies then converted them to a range of around 100 to 15,000 hertz. These frequencies were then sent to the amplifier and on to the rear channels.

A matrix decoder can not sense the high frequencies on a CD-4 record, it can only synthesize the stereo output of a CD-4 QuadraDisc LP.

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More CD-4

More CD-4

My own experience with CD-4 led me to stick with matrix-type quads. To hear a quad sound from CD-4 encoded vinyl I just send it through my Vario-Matrix decoder and let it synthesize a quad sound. However, there ARE those who use and enjoy CD-4. Cai Campbell is a quad expert with an opposing view. Here is his opinion:

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