I happen to own two pair, and have a large mound of serious ampolification (also old) to light them up. They are phenomenally inefficient, but worse than that, a extremely reactive. Take what you consider a decent amp (and skip the receivers) and the QLS will leave it straining both nuts to keep up. I have some rebuilt SAE amps which are good, and a Nakamichi PA-7 (the STASIS design) which is great. I biamp them using the built in biamp capability. The bass is powerful and solid (the PA-7) and the highs are fast and transparent. Also, the 48" column of tweeters has an extraordinary imaging trait. The soundstage does not move as you move up and down. It is like a "wall of sound", not a point of sound. The imaging is very good, but not so good as some more modern MTM designs.
With the QLSes, expect to spend some serious time auditioning amplifiers in your house with your speakers. Once dialed in, however, they are amazing speakers.
And you need a decent room to make them sing, also.
With the QLSes, expect to spend some serious time auditioning amplifiers in your house with your speakers. Once dialed in, however, they are amazing speakers.
And you need a decent room to make them sing, also.