I have just purchase a Yahmaha 1030, with Monitor Audio Radius 90s an Centre 200 plus the REL T5 subwoofer. Have just set the system up (7.1 channels), but I get very little response from the Sub. I put the receiver in auto sound calibration mode and when it did its mad noise I could barely hear the sub. The sub was set for max cross over and 50% volume for the test (as specified by yamaha). Afterwards I can only tell the sub is on by putting my had on the cone. I have tried turning the volume up to max but no difference. Please help.