A second sub won't give you more thump unless it's a thumping kind of sub
. The best advice I can give you is to get out and listen to more subs so that you can better understand what you may be missing. As for room treatments, I don't know what kind of treatment would absorb frequencies below 100Hz.
The most pleasing thump I've heard so far is from my cheap Sony. I get a lot of listening pleasure from the Sony paired up with the audiobytes. A close second is the EP350. All around, the 350 is a better sub though.
I was hoping by now that Randy would give us some more feedback on his EP600 equipped with the 150Hz filter. I've been waiting anxiously to find out if that leads to a touch more snap in the sound.
