I have the Rel Q150E subwoofer, conected with my Denon 2802 AV amp and Mission M72 speakers (for 6.1 urround). Subwoofer connection is via phono (IXOS) lead connected from amp to 0 dB Lo-Level connection on sub. Hi-Level connection is via Neutrik connector. Roll-off set on sub is around 60Hz. Problem is, everything sounds too soft since when I connected the sub. From anyone's experience, would this be due to too much Lo-Level output, Hi-level output or too much cross-over/roll-off, etc? Thanks.