amp problem

[bensta]

hey i have a problem with my amp. i have a kicker kx.350.4
and i am getting high pitch whistle from one of the amps,
.. i have tried with differnt speakers and it still makes the sound so i know its not the speakers, also with front and rear rca's.
the pitch gets louder when the gain is turned up, and goes away when i turn the xover onto low or whatever its called

cheers

[StoneX]

Is it still there if you don't have RCA's plugged into it?

Don't unplug or plug RCA's while the amp/head unit are on.

[bensta]

no its not there without the rcas pluged into it.!!
???
but i have tried differnt rcas, the ones for the front pre out and the rear pre out both make the sound, but only while pluged into the 2nd amp, the 1st amp is fine, if i cant work it out i'll have to run my rears off the head unit but i dont wana do that, any ideas on what it could be

[StoneX]

Sounds like it is something to do with the RCA's or the head unit to me. What brand/model head unit?

[bensta]

pioneer dehp7650mp
i will unplug all the rcas tomorro after work and try each one, in both front and rear pre outs to see if i still get the problem , i will let you know what happens

[StoneX]

I have a feeling it might be the head unit... Rather than pulling your RCA's out, can you get a multimeter and your head unit out? If so, disconnect the head unit loom, RCA's and antenna then measure the resistance(or continuity) from the chassis (shell) of the head unit to the outside of the RCA sockets on the back of the head unit. It should measure very close to 0 ohm on resistance or beep (for a short circuit) on the continuity test.

[bensta]

hope this helps, i dont have an multimeter handy at the moment but i just started the car for the first time scince doing the stereo and, guess what, you can hear engine noise or somthing along those lines, when you rev the noise gets louder and so on. one other thing , there is a piont when i turn my engintion of that the cd player still has power but the dash light ( eg battery light hand brake light etc) turn of , when in this position there is no stupids noises , jsalkdjas dang what the heck
how can i fix it. because i have herd of the engine noise problem before
cheers

[venerableChicken]

Supercheap, (and i dare say most car audio places) sell these things (dont know what they are called, sorry) that plug into the main power wire to your head unit that is supposed to eliminate that noise. You would have to talk to someone who knows more about this stuff than me but i'm fairly sure that would fix the problem

[StoneX]

They are noise filters... It's best to find the problem and fix the noise source rather than just filtering it out because it can still be there faintly or the filter can do nothing because it's a faulty product.

[bensta]

ok thanks mate, i jsut found a guide on the forum with differnt steps to take, in trying to eliminate engine noise and what not , i will run though that and see how i go

[bensta]

WOOO HOOOO found the problem i rewired the hu and bypassed the fuse box and it fixed the problem , i wired it though the fuse box aswell just to be sure it wasnt something else. but it is the fuse box, saved my self some money on buying those fliters

[raised_fist]

those high pitched noises, especially when you're revving your car, is probly due to your rca's coming from the headunit run down the same side as your power leads from the battery to the amp, it'll make these noises because the electromagnetic fields from your wires are, well, doin the no pants dance together....or just interfering with eachother if you want to put it that way

run your rca's and power leads down different sides of the car if they aren't already like this, it helps buying non cheap rca's too, like the double or triple shielded ones are supposed to help with reducing interference, for anyone who has this noise

[StoneX]

He fixed the problem in the last post... No need to bump such an old thread.