chat2tristan Posted October 12, 2018 Share Posted October 12, 2018 Rack your brains I need some help! I just installed a JVC KW-230BT into my 2009 Subaru Legacy Sedan with factory Harmon Kardon sound system in it using METRA Harness# 79-8901. I twisted, soldered, and heat shrinked each individual wire. There is a low volume hissing sound coming through all the speakers at the same time and its driving me nuts! I used the balance and fader to make sure each speaker was functioning properly and other then the hiss each speaker works correctly. The first thing I thought of was maybe a bad ground on the head unit so I tried a direct bare metal ground instead of using the harness and that made no difference. The sound only happens when the volume is above 0 and does not increase in volume as you turn the volume up it is just a constant low volume hiss. If you turn the head unit to 0 volume the noise stops. It doesn't matter what source you are using either. What would cause this? Signal from the aftermarket head unit to the factory amp issue? How do I fix it? Link to comment Share on other sites More sharing options...
Shadow_419 Posted October 21, 2018 Share Posted October 21, 2018 Assuming you have your high level outputs from the new radio connected to the h/k amp, you're probably hearing the noise floor of the radio being amplified again by the h/k amp. Link to comment Share on other sites More sharing options...
MaasaiWarrior Posted October 26, 2018 Share Posted October 26, 2018 re-do all I mean all your grounds throughout your audio system, it's the same thing if you get a buzz on a home amplifier 08 Spec B, insta: @08_spec_b, 10 SH Forester insta: @shfozzy Link to comment Share on other sites More sharing options...
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