You say you're not getting enough bass and you're using speakers that go down to 47hz 6db down. Personally I agree on the subject of metal dome tweeters give me a soft dome any day. But what you need are either bigger speakers with better bass response or a subwoofer.
Very small room systems and synergy
I have been trying for 20 years to put together a system for a very small (10' x 12") listening room and still haven't gotten it right. I am currently using KEF LS50's with a NuPrime IDA8 integrated with moderate success. I realize I really don't like metal dome tweeters and I've been drawn to class D amps. This is probably due to my budget constraints of $2000 - $2500. Does anyone have any input for me on this?