Superfi in Leeds told me that you can achieve biwiring simply by twisting cables together and plugging them in each single channel socket. When I queried this I was asked whether I knew anything about electricity and an explanation came out that I wont bore you with. On the other hand, Barnsley Hifi told me it only really makes a difference if you have A & B speaker outlets. Are they both correct? This issue came up when I suggested the advantage of 7.1 was that you can bi-amp the front speakers (I know this is different to biwiring). Hence, wire twisting the front speaker if you only have 5.1. Incidentally, Superfi Leeds also told me there was no such thing as a Marantz SR5400OSE even though its listed on their website! I think some of the people that work in hifi shops have a serious attitude problem. I really hate their supercilious manner and their attempts to use subterfuge.