just installed a pioneer deh-6900 in my car, I am getting a high pitched sound from the head unit, it happends if it turned on, or when it is turned off, but still has power to it. nothing when you turn the key off
I am kinda thinking this might be the wires getting squeezed in behind the deck,

any ideas?

also, when I turn the car on or off, I get a noise from the amp, sounds like a "pop"(kinda), I think it may be a bad ground, does that sound right?

any ideas would help!
thanks

anyone?
don't know if it is bad for it, just really annoying

check your speaker wires to make sure they are wired right + to + , - to -. also check ground at hu and amp

will do thanks, I will see if that makes any difference

I don't think the wiring to the speakers (+to+ and -to-) would have anything to do with it. If you really think they do tho take a AA battery and connect it to the wires coming from your amp to your speakers. + of the speaker to + of the battery, and - of the speaker to - of the battery. If the speaker pushes out you have it wired correctly, if they suck in, you have them backwards.

I would say that you have a positive touching a negative. In other words something is bouncing around grounding itself out. Check your RCA connections, make sure they are tight and taped up. Make sure you didn't run the power wire to your amp on the same side as your speaker wire, the EMFs from the power wire can make your speakers sound like crap and send in some strange noises thru them.

keep us updated.

Its alternator whine... common problem when a system is miswired, or if you have your power wire running through the same side as the RCA wires.

i have seen 4 pioneer decks now that make noises like that including my own .As it turns out all 5 of said pioneer head units had "induced" noise radiating from internal parts in the deck. Currently in the shop (mine is ) for repairs ,and i am told it's a bad internal ground as well.

I have the rca down the center of the car(for moving the amp later and I needed the length, power down drivers side, happends when the car is off as well, hard to hear, needs to be really quiet.
I have the amp turn of running with the RCA's, could that be the amp sound?

I have the power wire close to the speaker wire in the trunk, from the amp to the conectors(speaker wire), and the power wire is sitting there, need to move the rest of it out of the way.

I used the factory ground for the head unit, should I try and ground it to another part of the car?

that "pop" from the amp is probably because you just have the gain high up and when you first turn the car on it turns the amp on and the pop is coming out of the sub....well i'm assuming you have a sub lol...not a big issue..mine does it too because my gain is up high.

the last post was supposed to read ....."amp turn on running with"



ok, that does make sense, I have to try and tune it again, I read the thing to tune it but I got a little confused, the amp is a little more power then it needs so I think I need to turn the gain down even more, or maybe just install the remote "volume" control(whatever the thing is called that came with the mtx amp.)

do you think that the noise from the head unit should be a concern?, can only hear it when the volume is way down(more or less off), or when you turn it off with the engine still running.

do you mean turn the headunit off with the engine running..because when i turn off my headunit it makes a wierd hissing noise, but as soon as i turn it on it goes away and i have no noises at all and have clear sound through all my speakers..so i just make sure i keep the headunit on...so i dotn think its all that big of a deal.

ummmm....
kinda sounds like a electronic hum, very high pitch, really quiet, will be there with the engine on or not, is there when the head unit is turned on, or there is just power to the unit, but not playing anything(shows a clock and that is it), and its not comming from the speakers

I really need to make a sig soon

Alternator whine. Check your grounds, would be a good idea to ground the radio chassis to the car with a separate wire, that often will help or eliminate it.

the sound is still there if the engine is off as well, but I think I will try to just ground it to a better spot and hope that it works better

Greg Z. wrote:Alternator whine. Check your grounds, would be a good idea to ground the radio chassis to the car with a separate wire, that often will help or eliminate it.

how can it be alternator whine when he said its there with the car running and NOT running .If the hum is there with the clock on then a poor internal ground should be the culprit causing "induced" noise . My pioneer DEH-P8MP is in for the very same reason but a much more pronounced hiss and pop .

could the hum go away if I make a better ground or will it still be there, can't hear it unless the music is off anyway

boom wrote:

Greg Z. wrote:Alternator whine. Check your grounds, would be a good idea to ground the radio chassis to the car with a separate wire, that often will help or eliminate it.

how can it be alternator whine when he said its there with the car running and NOT running .If the hum is there with the clock on then a poor internal ground should be the culprit causing "induced" noise . My pioneer DEH-P8MP is in for the very same reason but a much more pronounced hiss and pop .

True. I misread it I guess.
Will add one thing that happened to me, my speakers would emit static, especially the front right, I initially thought my head unit was at fault, since it was getting rather old, so I upgraded, and the static stopped. Well, it started again shortly thereafter, so just for the heck of it, I started tracing the speaker wire from that speaker through the side of the cowl, up under the dash all with the radio on. Once I got my hands up behind the glovebox and was moving/jiggling the harness up there, the static stopped immediately. I let go of the harness and it started again. so I loosened the harness from a plastic retainer that was up in there, and haven't had the problem since.
Now whether that would help here or not, I don't know, since he says its coming from the headunit itself.

so one of the guys i know with a pioneer head unit DEH-P8MP after i told him the same thing about induced noise , he took his P8MP to the shopo and had to pay $80 to get it fixed and it turned out to be an internal ground fault

problem would probably be your grounds. which one, i dont know. try making better grounds with all of them.

example, run an extra piece of wire from the ground of your amp straight to the negative terminal of the battery and same with your deck.

it can even be where you mounted your amp. if you have it mounted on the back of the seat for example, the screws that you attach it with will touch the chasis of the amp and the metal thats in the support for the back of the seat. this will cause another ground to happen. a ground loop can happen with volt or millivolt differences between grounds that are too close.



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