First of all let me say this is a great forum with tons and tons of information for newbs like me. Recently I installed an F90BT into my 07 Civic Si. Great stereo, everything works as advertised, but I have a couple of problems with it. Done plenty of searching/reading/etc. but none seem to answer my questions and I was hoping some of you may answer this...
1. The Si has a factory amp and subwoofer so we hooked it up using a harness that would integrate with the stock components. Everything seems to work fine, except:
a. There is a slight hissing noise on all AV sources. When th
