Looking for a little help here from all you HT gurus out there. I have a pair of Acoustic Research S40's that I have setup as my mains that I would like to eventually biamp. I currently have all 5 HT speakers connected directly to a Sony STR-DE485 receiver which has no pre-outs (to add an amplifier). Down the road I am going to upgrade to a pre/pro, but I do have an old Onkyo A-7070 amp that I am not using. Is there anyway of using the Sony receiver and Onkyo amp to biamp the AR's even though the Sony doesn't have pre-outs?? I'm saving up for a pre/pro, but I'm already hooked on catching the biamp bandwagon! Any thoughts or comments would be greatly appreciated!