A typical quadraphonic 8-track tape with a notch in the upper left corner. This notch tells a quadraphonic player to use 4-channel mode instead of regular stereo mode.
- List of All Known Quad 8-Track Tapes
- “Quad Reflections” by Dan Jobin
- The Quad FAQ
- “Discrete Four-Channel Sound on Magnetic Tape” by Leonard Feldman
- Quadraphonic Quad Discussion Board
- Dave Morton’s definitive Quad article: “Dead Media: Quadraphonics” http://www.deadmedia.org/notes/30/309.html
- Dan Olson’s THE QUAD PAGE: http://www.rdrop.com/~dano/tunes/quad.html
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