The answer to great low bass is a good sub woofer. When I added a pair of REL subs to my Theil 3.7s, it made a big difference not only in base response but also increasing the sound stage width and depth. The RELs disappear. If you didn't see them, you wouldn't know they were there. Two REL S/5s or better will definitely do the trick.
low bass response
My system, which is shown on my profile, does not seem to produce the low bass I would expect it to. I listen near field, and my room is 13'x30'x9'....in your experience, is this most likely due to my room and near field position?