This info (below) is on back/bottom of sleeve: The SQ disc may be played with excellent results through any conventional high fidelity system - stereo or four channel. Played on SQ QUADRAPHONIC systems, it will provide the unique experience of four-channel listenin at its best.
Matrix / Runout (Side 1 Label): QAL 33053
Matrix / Runout (Side 2 Label): QBL 33053
Matrix / Runout (Runout Side A (stamped, exc XT, etche)): QAL 33053-1A C XT P
Matrix / Runout (Runout Side B (stamped, exc XT, etched)): QBL 33053-1A A XT P
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