I have a Wharfdale SW 150 subwoofer linked to a Pioneer VSX 1021. When I do a speaker test the subwoofer passes the sound test though after a pause of a second or two. But there is no sound coming through my subwoofer during any programmes even HD movies. All programmes are sadly lacking in base despite adjusting the subwoofer speaker level on both the AV receiver and the sub-woofer itself. Anyone got any ideas?