Against best practices, I grounded my amp to the seat belt bolt at the rear seat that holds two seatbelts. I am getting a very faint high pitched noise at random RPMs. Its getting annoying because I am incredibly picky. Unfortunately I am on a lease so I don't want to sand down the paint or drill a new ground hole.
I am using an LC6i at the factory amp fed into a Kicker ZX700.5.
Anyone having the same issue or have a better ground location I can use without modification to the truck?
Most people won't recommend, and I don't recommend either UNTIL you have exhausted all other options. No matter what I did in my old Tacoma I kept having a faint high pitch whine in the front speakers off the amp. I followed all the right practices as listed and such, but there was still some noise being introduced and I couldn't figure out where. I installed a Ground Loop Isolator just for haha's (I had one laying around) and removed the hiss.
Like I said I wouldn't recommend just installing one, but if you can't narrow it down, it might not be a bad idea to try.
Behind the rear panel there is a factory ground. I used that for a while.but was still having a problem. Turned out the lc6i was the problem. It amplifies the factory radios dirty signal.
I ended up bolting a ground under the carpet thru the floor pan and still had the noise. So im pretty confident that factory ground point would have worked great. Its behind both rear side panels where the seatbelts are.
I was wanting to try those. Any truck to getting the plastic cover off the seat belt bolt for the rear panels? I tried tugging a bit but I didn't want to break it. I didn't know if it had to get rotated a certain way or if its just on there really tight.
There was something in the instructions of the lc6i on grounding. I want to say it says not to ground to the chassis or maybe that you are supposed to use the same ground as the amp. When I had one I ran the lc6i ground to the ground output on the amp since they were next to each other. Worked well.
you typically want to utilize the ground with the audio system instead of making additional grounds. theres a youtube video explaining the jumpers and such for the lc*i equipment.
I completely disconnected amp and the sound remains, so it is simply engine noise. As stated before, it was very quiet. I must have not noticed it prior to amp install. Its a slight high pitched noise around 2k RPMS, just kind of sounds like a mild supercharger air sound, I am guessing it is completely normal.
Oh... So if you have your sound system off you hear it still. Yes that is the waffle gasket behind the throttle body. Some hear it really bad with no mods done to the air intake. Others like myself heard it awful after using an aftermarket drop in filter. There is a fix for it.... You can either buy the gasket with no waffle, or take yours and snip the waffle out.
Try switching the jumper on the Ic6 from isolated to just ground. I heard it's helped other with inline noise.
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