sonic frontiers line 2 owners

I received my new line 2 preamp last week and have been leaving it running everyday since. After the first couple of days it made an improvement in opening up but after that it seems to have leveled off, sounds like someone threw blankets over my speakers. No detail and my bass is almost gone, sounds filtered like some marantz and bob carver stuff I auditioned, Ick. Does anyone else have this problem with thier preamp. I used to have a conrad johnson pfr which sparkled and had plenty of slam, had to let it go because it wasn't compatible with my other components.