Don,
In my system and for my taste, the Quads do not require a sub. I have a good sub in the room for my HT system and I could use it, but choose not to do so. BTW, my pair of Quads took a very long time to break-in. They did not sound very good out of the box, so I let them play over a 10 day vacation. When I got back home, they had transformed into a very nice sounding speaker, especially good at the price I paid.
Also, they do respond greatly to bass reinforcement as they are placed nearer the wall behind them. I found a happy medium at about 2 feet out from the wall. Closer, they get more bass reinforcement, but get a little boomy for my taste.
See y'all later......
TIC (Tom In Cincinnati, but still a Kentuckian at Heart)
