did you check the wires from the headunit to make sure everything is intact? same for the wires by the speaker also... when I swapped headunits I had one speaker wire on the factory harness come loose and cause a buzzing from only one speaker. I forced the wire back into its place and glued it in so it wouldn't come out again.
Do the world a favor, hurt a honda...
Iro 3" lift with pro comp 9000es shocks, adjustable trackbar, led rock lights, all interior lights converted to leds, two 10" kicker comp with Kenwood 600 watt amp
Zombie Outbreak Response Unit #396