I new a guy named Mugs he had a pair of these. They sounded better than the QLS1. Theses were powered by infinity amps and used an Infinity preamp too. No Idea who actually made them.. They were in one of the first large treated rooms, I had ever heard and the guy had 2 (TWO) VMPS passive subs. He worked at the largest record retailer in the Bay Area for 10 years.. 10,000 records at least.. You wanted to hear it, he had it.. :-) Mugs went to heaven. :-)
Regards