For some time now I've been using an AV30R very successfully as a stereo preamp. The on board DA conversion improved my CD player and the 5.1 output from DVD invariably sounded much better than the stereo even though it was mixed back down to two channels. The recent clearout via HiFiBitz seemed too good an opportunity to miss and I acquired a 700:7r with a view to finally moving to surround sound. Impatient to get going, but reluctant to lash out lots of cash on surround speakers I've set up four very cheap rears and temporary cabling to allow me to experiment wth positioning and the relative merits of 7 and 5 channels. Finally I get to my problem/question. The surround channels have a constant hiss whenever they are active. This is independent of the volume but is loud enough to ruin the experience with anything except high volume movies. I would like to think that this could be due to the rubbish unscreened cables I'm using but I'm not convinced. I don't want to start shelling out lots of cash if it's an irresolvable problem. Based on what I have heard so far, music listening could continue in stereo only and I might be better of bridging or bi amping my front channels and adding just two rears for movies only. I know that the SN ratio of the surround channels on the AV30R is compromised compared with it's bigger brothers but was expecting more than this. Can anyone confirm whether this should be expected with this set-up, or perhaps suggest what the problem might be?