Hi, I've just bought my first sub (the above) to go with Mission m74 floor-standers, Tanoy mxC, and Tannoy mxR's (basically a home cinema setup but also occasionally for music). I have a sony 940 av receiver. I've wired up the sub to the receiver using the phono cable that came with the sub and it all seems to work (it certainly makes a thud). However, there was also a rather meaty looking 'high level' cable included with the package and I'm just wondering under what circumstances (E.g. what kind of amp etc) would I need to use that? Also, I have purchased a copy of Avia which will be with me shortly. Does it include any sub calibration/setup screens that might allow me to make sure I have the dials set to the correct levels? I only unpacked it last night and therefore don't really understand the relationship between phase, frequency and the high/low gains. Any tips would be welcome.