When I had my shoppe in Florida(early 80's), I upgraded a few DQ-10 crossovers, replaced the Motorola Piezos with JVC ribbon tweeters and mirror imaged the customers' pairs. Talk about sweet performers(for their time)!
Who remembers the Dahlquist DQ-10's?
My first pair of "high-end" speakers. Power hungry critters but what I would give for an updated pair. I powered these with a Peavey CS-400 and a Maccomack Deluxe Line drive passive preamp!! Those were the days! Young and dumb I suppose?