Background you need to know.....
I have been kind of playing my setup but not a lot since I do not have proper electrical installed yet. It has been setup like this for a couple weeks with no problems as long as I do not play it long, and mind my voltage drop. I want to add that I have never ever had any kind of ground loop or alt whine or any noises like that until this all happened this week. I have had stereos in and out of this car for 6 years with no problems.
Here is what happened.
I was playing it in the driveway with the engine running. All of a sudden the Kenwood KDC-X996 went into protect, I was actually turning the volume down when it did this. So I pulled the RCAs and the harness let it sit, and then hooked it all back up and it worked liked new again. So I was like hmmmmm, maybe I sent an amp into protect with voltage drop and the Kenwood sensed it and went into protect as well
. So I moved on, since it was playing fine again.
I come out the next morning and start my car and it sounds like a missile is flying by, all the highs and mids are playing humming and whistling sounds really loud, I mean unbearably loud. So wow it was fine the night before and nothing changed and now it sounds like this.
I pumped the gas and the whine got louder, ok alt whine. So i cut the car off and the whine did not go away but it got quieter. I have never heard alt whine when motor is not running, really strange
? So I messed with some stuff and turned it on and off and you know what all the noise went away, I drove my car into town grabbed some stuff at the store and when I came out and started my car the noises were back again. So I turned the HU off and drove home.
Then I went through all the steps, back to front.
I checked RCAs for problems they all read normal resistance and have no pinches or cuts. With the RCAs checked and passed I moved on....
I then plugged Ipod into the RCAs and RCAs into the amps and played music directly to the amps one at a time from the Ipod with no HU, it was crystal clear on both amps. Amps checked and passed.....
Then I hooked the highs amp back up to HU and turned it on. All the noise was gone and it actually sounded better then before, like it was a cleaner signal now. So I unplugged highs RCAs and plugged in just the Sub amp RCAs, sounded great, again. With no highs at all I could really hear the subs and they sounded clean and clear, no thuds or pops they were right back to normal.
So I hooked the highs and sub amp RCA back up and bam super loud crazy missile sounds coming from highs speakers but not from subs.
So I then unhooked sub amp RCAs and had clean highs again and vice versa, basically as soon as I hook up the both RCAs I get all kinds of noise, like ground loops and alt whine at the same time. I only hear it in the highs not the subs, maybe the sub crossover is filtering out the noise so I just don't hear it in the subs but they both sound clean when hooked up on their own but when I hook up both sets of RCAs the sound comes back.
I am pretty confused by this, the HU works perfect with either set of RCAs hooked up but not both.
What do you think?