You should try the sub woofer crawl. With subs its all about placement as with all speakers but especially subs. I find that even after a sub crawl, you may need another to flatten the responce of the room. i hope that this helps. I have a ep600 and had the same issues that you are encountering. the sub placement is night and day when you find the "spot"

hope that this helps.


M80-QS8-VP150-EP600-A1400-8
STR-DA5300ES BDPS5000ES.

Mark