Hi Chaps, I Have a long and convoluted query, please bear with me! I have a Yamaha DSP A5, Mission 780s, 78C, 77DS and REL Q150 sub. I have a bass management issue. With all speakers set to small, and bass out set set to sub, I am missing a lot of bass I think should be there. If I change my mains to Large, bass is routed from the other channels correctly to the sub. I thought this was just a "characteristic" until I borrowed a copy of Digital Video Essentials. When playing the bass management test tones section I found that bass was correctly sent to the sub when a single channel was playing; but when the "Half-Left or Half-Right" tones were played, bass would all-but disappear from the sub. If I then changed the main speakers to large, the bass would be correctly routed to the sub. The best way to explain it is: bass that is half way between two channels is lost - bass that is present in a single channel only is correctly routed. But when main speakers are set to large, all bass appears correctly routed. I've checked, and I'm certain that nothing is out of phase. But, I don't want to have to run my mains as large, because I've already had to replace their drivers! Does this sound familliar to anyone? My worry is that this is something in the specification of the average bass management circuit and I'm stuck with front speakers as large. But, if my amp is indeed at fault what would you reccommend to me as a suitable match for my speakers and sub? Thanks in advance!