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





(updated March 2014. scroll to bottom for new addition to this post)

SQ was created by the CBS Technology Center and was made available to the public in April 1971. Rear channel information was placed on a vinyl record by adding “…double helical groove modulations… alongside . . .vectored modulations…” that produced the sound for the front channels. The SQ decoder sensed the different signals and did its best to send the appropriate sound to the correct speaker.

Continue reading