I wonder if I am not doing something really basic.
I have Boston Acoustics Soundware 5.1, plugged through a Sony STR-DH810 using a phono cable and all hooked up to V+HD, an LG 50PK990 plasma and Sony BDPS370. I have tried it with same connections in a Sony STR-DH510 and have changed the phono cable too. The AVRs have been set for surround sound and appear to be telling me they are ready to drive the subwoofer (the icon appears on the AVR screen). The small speakers all work fine but the SW fails to make any noise whatsoever (and the cone isn't vibrating, which I suspect is a bit of a giveaway).
Is there anything else I am obviously failing to do, or appear to be doing wrong from the info I've given? Alternatively I wonder if there is a way of testing the actual device to see if it is functioning.