I have just brought 鐘神AV-1000D as power amp to push the front and centre speakers and using Denon 4308 as pre amp. When I use 4308 auto set up, it show that my front and centre speakers are wrong phase. However I am sure that the speaker cords of +/- are all correctly connected to the speakers and A1000D. When I swap the +/- speaker cables at A1000D, 4308 does not show wrong phase. Do any brother help to solve this problem.