inputs.text: device may fine depending audio problehem - hard tell much device definitely could tell difference installed didnt help situation dont blame device thoughi believe problem improper grounding engine componentssharing ground head unit got prognosis following troubleshooting flow chart find searching diagnose suppress noise looking crutch fields site pretty easy follow taught lot taking apart sound system previously nervous dothe end result would purchase crutch field s10a install head unit receiver instead tried lowering amp volume raising receiver volume im fine engine squealnoise amplified amp regardless receiver volumehope helps