Hi, I have my M7c1 centre and my M7ds bi-pole rears set to small as advised by a realiable source. Firstly, is that correct? When I first purchased them I was under the impression that they could be set to large as I thought that they could handle lower freq'. However, I have since been advised that they cannot go too low and this could blow or damage the drivers. Not a problem, as I have simply configured them to small. However, this then opens up the cross over option on my amp, a Sony strdb870, for both speakers. Presently, I have them set at 120hz which is the amps default cross-over. However, I am totally unsure how to set them to get the best from them set to small. I understand that THX recommend 80hz as a cross-over but then again, they are not THX spec. if you can, please advise. All advice taken on board. By the way, the M72 fronts are set to large. Captian.