But be careful folks. I tightened the bass so much the treble popped out and broke on the floor!
Well I thought that was funny but it's pretty early on a Saturday morning.
Anyway, I have 3-series Maggies and those actually pump out beautifully tight bass, but I have found that to get the SPLs I prefer (music always sounded best to me in clubs), I use a swarm of 4 subs - 2 in the 10 inch range and 2 smaller ones. Primarily RELs that are geared towards music. They are each dialed in such that you don't perceive sound coming from them, but together they subtly control the room SPL while reinforcing the bass from the Maggies. I find this method more all enveloping than the brute force of a single big sub. Give it a shot!