Just wanted to say that I recently purchased a kit from Joe at PlugnPlaykits.com and it made my install go leaps cleaner and easier than it could have been. Joe was great at responding to the few questions I had and I would highly recommend that if are upgrading your audio system that you go...
Looking at page 11 in the manual for your A1100.5 amp. It says if you are running the speaker level into the amp like you are you should set it for 4 channel instead of 5.
What do you have the input mode set to?
And I also see
Input Mode Switch – Select 2ch when only one pair of RCA and...