Alternator Whine

[I.C.E.87]

hi

ive got a pioneer hu (deh-p7500mp) and when i plug my amp to the h-u ive got a bizarre noise (they call that alternator whine on google)

i change my ground of my h-u
change the rca
change ground of amp

the sounds still there ...

ah and ive try with a noise remover and the noise is still there .....

plz help me out with this one !

[visualpoet]

What kind of amp are you running? Are you sure your ground choices are solid bare metal? We really need more info to help you out.

[I.C.E.87]

i run an 600 w amp
my ground are on bare metal
... what do you want to know ? tell me and ill tell you

the sound is more present when i accelerate

[visualpoet]

Well, what brand of amp would help. Are you sure your wiring is correct? If you've got a cheap amp or one of your channels is out of phase or if the HU ground is bad, you could get whine. The more information you volunteer and the less we have to drag out of you the better. lol help us help you.

[angus67]

wen you wired your amp, did you run the rca's and the power wires all together? this is the main cuase of alt wine. there is plenty of space to run the power cables and rcas seperate under the plastic peice that is the door sill. it just pops up. run your wires thru there. if you have to cross wires, cross at 90 degrees.(criss-cross).

[accordztech]

yea what he said, though i ran them on the same side all the time and get no issues.

you can be looking at either a bad head unit, or a bad amp. also what is the condition of your battery...those act as a big filter in engine noise.

[hybrid90accord]

borrow a friends radio and hook it up in ur car and see if the noise goes away, or try grounding the RCA wires

[coletrain]

I have a similar situation. I have a DLO Zune car audio receiver. When I'm not playing music I can hear the alternator whine through the speakers.

[I.C.E.87]

i have try an other radio and it's all okay !

so i got a bad headunit ?

[vietkid_2006]

my uncle has a stock passport headunit on his passport and it does that like crazy everytime you accelerate.

lol its like a little supercharger sound haha.

[angus67]

my uncle has a stock passport headunit on his passport and it does that like crazy everytime you accelerate.

lol its like a little supercharger sound haha.

tell your uncle to amp that up, and put some speaks on the outside of his passport!! no one will ever mess with him!!

[91accordcoupe]

i have try an other radio and it's all okay !

so i got a bad headunit ?

Yep that's your problem then... I've seen recently that Pioneers are prone to give this whine... My boy has gone through 3 HUs (all pioneer) and they all have done this
and he finally tried another brand and poof.... sound was gone

[loud92CB7]

its a bad RCA ground in the HU. simple fix is take about 7-8 inches of wire and ground it. then strip it back far enough to let the rca slide over it... very simple and works.... there are places on the back of the radio u can use for a chaisis ground.

[mj213]

I get this when my power or ground wires are too close to the speaker/signal wires.

Poor shielding, most likely.

[accordztech]

Yep that's your problem then... I've seen recently that Pioneers are prone to give this whine... My boy has gone through 3 HUs (all pioneer) and they all have done this
and he finally tried another brand and poof.... sound was gone

i had pioneer all my life and it was fine. just the pick of the litter i guess.