noise from amp?

[billysch]

there is some noise came from my amp when i m driving
i found that the noise is larger whereas the rmp is higher
just feel a bit worry is it a matter to the amp or just a wiring problem?
thanks

[spiderman]

Try checking your earths first....

Also are you running your power wires away from your RCA's ....if not run them down opposite sides of the car....

What type of gear are you talking about...new items or older amp..

Make sure you have only run a short earth wire to your amp not a long one with the power wire...

Webby

[billysch]

Try checking your earths first....

Also are you running your power wires away from your RCA's ....if not run them down opposite sides of the car....

What type of gear are you talking about...new items or older amp..

Make sure you have only run a short earth wire to your amp not a long one with the power wire...

Webby

sorry, i m a newborn in audio...
what do u mean by RCA's??
sorry for that stupid....:confused:

[SuiJin]

Its alternator noise most times when this happens,
Ground your amplifier, in other words make sure u have sufficient contact for the negative with the chassis. sand paper the paint where you screwed the wire to the chassis for more contact.

[keniirox]

RCA the wire with 2 separate insertion things at both ends that connect from the headunit to the amp >< .. red n black one usually

n when sanding the paint back you need to sand it down to the metal so the ground has full contact

[ICACHA]

sorry, i m a newborn in audio...
what do u mean by RCA's??
sorry for that stupid....:confused:

where you located? can point you in the direction of a store for you to visit, sounds like your not up to the job of fault finding :)

[billysch]

so..
what i got is.... the ground one is not fully contact in order to have that alternator wired sorund?

[STARTSat7]

step 1 = check if your (EARTH BLACK GROUND) cable from the amplifier to the chasis is nice and tight (also might want to check that it is in contact with bare metal.

step 2 = if you RCA's (the two cable's coming from you deck to your amp) arnt running through the car along with your power cable (BIG RED ONE FROM BATTERY +)

step 3 = if both steps have been completed and noise still there. purchase urself a noise filter you can get from autobarn etc that plugs into your amp which should do the job.

if all 3 dont work and your located in west syd i can help you out =]

[billysch]

thanks STARTSat7
i think the problem should be step 2...
i will try to fix it...and see is the problem sill here
THanks all

[g_kn]

Run Battery Cable
&
RCA Cables down each side of the car Seperate.
Will do the job

[pizza_boy]

I found on my previous setup, that front speaker cables (same could be with any audio cables) were running close to ECU/ECU wiring unprotected, and it was interfering in the same way.
hope it'll help:wave:

[billysch]

i have seperated the power cable and RCA by opposite of the car
and the ground one is also well contact to the chasis
BUT .... the alternator sound just not let me go.....still here
PLZ HELP~~
i'm located in Brisbane....

[RtN]

Umm.. well I had exact same problem... you have to classify your problem first.. everyone thought it was the amp.. but was actually my head unit... Ok here is what you do... to find out if its your amp or CD player thats playing up... in first step.. Play A CD or MP3 (IPOD OR WALKMAN) using the RCA to Headphone jack cable if you can find one. Where the headphone jack goes into the ipod/cd and the RCA into your amp.. play it but make sure your Headunit is on too coz it powers the AMP via Remote. See if you have the noise still if it doesnt then it might be ur head unit. To test your headunit of running the RCA to the amp just disconnect it and power your speakers via your headunit see if there's still the whine? That should help start it out... also if you have friend maybe swap your Amps to see if it still has the same problem..

[ICACHA]

Audio Express, PM him as he's on these forums...

[billysch]

i have changed another place for the ground..
and it makes the sounds a bit lower...
but still have it..
i start to think is the headunit problem...
keep looking for the problemSSSS....

[civic88]

i had the same problem, buy urself a noise filter it connects to the amp and it shud fix it

[VTec1987]

i had the same problem, buy urself a noise filter it connects to the amp and it shud fix it

I wouldnt recommend getting a noise filter, the noise filter will make the music sound shit.

You gotta ground the amp and the head unit again. That will fix the problem.

[civic88]

I wouldnt recommend getting a noise filter, the noise filter will make the music sound shit.

You gotta ground the amp and the head unit again. That will fix the problem.

do u hav first hand experience?

[TYP32]

U should never need a noise filter, your problem could be multiple issues.
As mentioned by others it could be a grounding issue, but more specifically, for those technically minded, even simple spot welds in your floor pan will create more of a chance of engine noise, always ground your system and battery off the same chassis rail (any welds of any kind simply add to having poor grounding).
Secondly it could be that you may have an old amp (which in itself isnt a bad thing), but over time, old equipment can get dry solder joins, therefor having bad connections = induced noise.
And possibly lucky last, check also the voltage your headunit runs down the rca's, most late model head units will tend to use around 4v down the rca's, the higher the better. If you aren't running enough voltage down your rca's this will also be an open door for engine noise (worse case, invest in a "line driver")
Hope this helps billysch
P.S. for all those old skoolers, i used to be a car audio installation judge under the old IASCA rules ;)

[VTec1987]

U should never need a noise filter, your problem could be multiple issues.
As mentioned by others it could be a grounding issue, but more specifically, for those technically minded, even simple spot welds in your floor pan will create more of a chance of engine noise, always ground your system and battery off the same chassis rail (any welds of any kind simply add to having poor grounding).
Secondly it could be that you may have an old amp (which in itself isnt a bad thing), but over time, old equipment can get dry solder joins, therefor having bad connections = induced noise.
And possibly lucky last, check also the voltage your headunit runs down the rca's, most late model head units will tend to use around 4v down the rca's, the higher the better. If you aren't running enough voltage down your rca's this will also be an open door for engine noise (worse case, invest in a "line driver")
Hope this helps billysch
P.S. for all those old skoolers, i used to be a car audio installation judge under the old IASCA rules ;)

:thumbsup:

[arverson]

i had the same problem, buy urself a noise filter it connects to the amp and it shud fix it

thats just a band-aid fix.

with all this discussion, and still no solution id say take it into a specialist to have a look.

[tron07]

alternator whine.... best is to redo all your wiring... usual cause is power wire sticking too near to RCAs, or bad grounding...

Noise filters filters out all the high frequency too, which is bad.

[danyboi]

if your RCA, and Power are on different sides of the car,

AND

Your earth point from the AMP is good, ( i.e. you have not just screwed)
You need to find a decent piece of metal, drill the hole, and Sand the area around it back, then earth to it Tight.

If both of these are fine, depending on the size of your amp, Check your Battery Earthing point to the Car Chasis, and make sure is good.

If all those are fine. Go to JB Hifi, or autobahn like someone else suggested, and Buy a noise filter canceling kit, should plug into your rca cables, and from there to your AMP.