workmeistr
Member
I scored this at the local Half Price Books for $1. I have no scientific way to prove that it's true SQ, and it's not mixed dynamic enough to verify by ear, but the front and rear graphic equalizers seem to show different sounds emanating front and rear. I thought the America catalog was issued on Warner Quadradisc. Were SQ records made in Japan from masters or existing 4-channel media and encoded to SQ?