pacific stereo distributed these as far back as late 60's /early 70's. the 10" would be the Q3 model.had Q2's(12" 3 way) with a 35.00 used sansui 1000A receiver and they rocked for me at the time.
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I bought a pair of Quadraflex demos from Pacific Stereo in Milwaukee in 1979. They had a dome tweeter. They sounded better than anything I'd ever owned. That dome made me visit Flanner & Hafsoos (THE Hi End dealer in Milwaukee, then), many times, to lust for the big (& unaffordable
for me then) ADS towers.....