I've got the Accoustimass speakers and woofer going through a Yamaha DSP-AX750 SE amp. However, I've noticed that every now and again when watching Sky+ (through a digital audio output), the subwoofer turns itself off so we get really crap sound from the left, right and centre speakers only. If you change channel it sometimes (but not always) turns it back on or if you turn it off and on again at the socket. It seems to do it when the sound is turned down below a certain level. Is this a feature I haven't bothered to read about in my manual? If so, how can I stop it from happening (without having to read the manual, which I'm not big on as you might have guessed)? I spoke to someone at the shop where I bought the speakers who was very vague about a "fuse" that sometimes goes and I would need to bring the woofer in to be sent away. I don't really want to do this as I'd have no replacement. Especially if it's a setup problem. Anyone got any ideas about this? P.s. I'm aware of the general feeling about Bose on this site but when it works, I'm more than happy with it.