I have a set of QLS that are in quite good shape with all drivers working. There is a tremendous amount of info in the Infinity forum about these speakers. Take some time and read up on them. You really need the best amps you can afford to appreciate them. Lots of watts, lots of current to drive the complicated low ohm load. The tweeter and midrange pots next to the binding posts are notoriously susceptible to corrosion. If you hear crackling or dead spots when you turn them they need attention. Good luck!
