As recommended by Mapleshade, I am running my subs using the speaker in terminals(for those subs which have them) from the speaker outs of power amp, with excellent results.
subwoofer cable recommendations.
About five months ago i purchased a Hammer Lite subwoofer directly from GMA, and since have tried several cables including Monster cable, Cardas Quadlink, and Audio Magic Excalibur ll without success, either too lean or to booming of a sound, I have read about a couple cables that might be right for my system, one is synergistic research the other Audioquest SUB 3, if you can think of others i would appreciate it .