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I use motion picture theater speakers. L&R are Altec 825 basshorn-reflex cabinets with 515B 15" drivers, top ends are Altec 806 compression drivers on 511B horns: A-5 bottoms with A-7-500 top ends. Sometimes I substitute JBL 2420 drivers on Edgar wooden "saladbowl" horns for the 806-511s. Bass below 100 cycles is augmented with 2 JBL 4648 double 15" motion picture theater bassbins for a total of 6-15" woofers reproducing the range below 100 cycles. System efficiency is 106db 1w1m. No center speaker, used to use an Altec 605A DuPlexe studio monitor (a "real" monitor that uses a 15" woofer with a piggy-back compression driver and a horn that extends through the woofer pole piece) but didn't need it. Rears are Radio Shack jobs, those little guys with a 5" woofer and film tweeters. I was using JBL 4560 basshorns with JBL LE-175 drivers on JBL horn-lenses in the rear but a total of 80 cubic feet of speakers was taking too much room. :-)
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