I tend to agree that the bass on the 1.6's is pretty good without a sub. It is important to move them out from the back walls in order to avoid cancellation of the lower frequencies. If you have unavoidable room placement issues a sub might be the only answer for deficient bass. If you go with a sub, go for one that is noted for tight, fast, bass response in order to emulate the Maggies. Also, you can do better than the AQ-4's. I used AQ-4's biwired, and they were OK, but I replaced them with Signal Silver Resolution and found them to be much less grainy than the AQ's. If it were me, I'd replace the wires and move the speakers out a couple more feet from the back wall and see what you have before going with a sub.