Hi guys, Last week I got a stereo installed in my FG ute. - Alpine F300 amp - 12" Slimline kicker sub - 6" JL Audio speakers in front Im running these off the stock ICC Headunit, and have a hissing sound coming from front left speaker. Installer assures me everything is grounded correctly and maybe an issue with factory head unit. The amp is just "amplifying" the hiss which might have always been there. He has another FG install in a few weeks and will let me know how he goes, but has anyone else come across this or heard about it? Thanks