I just got two behringer ep 1500 amps and can get only channel 2 on both amps work but cant get channel one to work its getting signal but sound is going out to my left speaker only to the right speaker I have 1 and 10 turned on on the dip switches like the manual said to do for stereo mode I am using Yamaha RX-V1700 to supply the signal with XLR TO RCA adptors for the amps which one amp is for my mains and the other amp is for my center channel using the channel 2 which works for the center speaker can someone tell me the right setting to use for stereo mode so I can get all 4 channels running Thanks markkirk1