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My Amp And Subs Are Fine, Until I Switch On The Car And I Get This Buzzing/wining Noise How Do I Fix This?

tommo87

By tommo87,
in Car Audio & Electrical

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tommo87 Community Regular

tommo87

Posted
Posted

Hi guys, having some troubles here. got ur basic system 10inch running atm, amp, speakers etc, when the car is turned off and the systems running its fine, but asoon as the car is switched on theres instantly a strang buzzing/wining kinda sound, lol its getting kinda annoying now soo i think i should sort it out, i think theres some interference with the car and system? can any liners help me out there?

thanx

DRD-00F Grand Master

DRD-00F

Posted
Posted

You said it, interferance.

I'm assuming the sound is coming out of any speakers that are on amps? (possibly all of them.) Whoever has installed it has probably run the RCAs with the power wire, or power wire for something else, and it is corrupting the RCA signal.

What I normally do in this case is get a long set of RCAs that aren't being used in a car (any shitty set will do, ask mates if you don't have any) and just run it from the source unit to the amp. For me (and probably you) that's from the dash to the boot, I normally run it outside the car as it's just a test. Try that, and if the sound goes, then there's your answer fish bulb!

There's other shit you can do, but finding out if the RCAs are being intereferred with and moving them or the power wire causing the problem is the best long term fix.

What type of RCAs do you have?

some_cs_student Veteran

some_cs_student

Posted
Posted

Out of curiosity, did you run twisted RCA cables? Or standard?

Twisted are said to help with interference...

Carbon 34 Grand Master

Carbon 34

Posted
Posted
Out of curiosity, did you run twisted RCA cables? Or standard?

Twisted are said to help with interference...

some twisted pairs run near power or computers will create inductance induced noise?

try running a pair of working rca cables even 2 dollar cheapos outside the car to the boot amp. did the noise go ?

no

try the antenna wire, is it loose or unshielded, they pick up a/c from fans, etc if loose

deck grounded to metal or car harness, try the metal of the car

all power goes down one side of car if its front battery. and rca down the other side,, ALWAYS!!

otherwise look at the grounds for amp, secure, no paint

rca crossing over fuel pump harness? if so move it over or up

does the noise increase with fan on, window heater on? if so check the battery connections, clean , tight ? run a ground wire to alternator bracket bolt to ground on battery.

do you hear whine on alternator, with fan on, heater wires in window on? might be a bad alternator, have it checked with Oscilloscope for A/C ripple ?

a stiffening cap will reduce whine on amps ? removes ripple but alternator must be good to start with?

does the whine increase with rpm.... fans, heaters off? coilpack voltage leakage ? or voltage regulator issues,

might be overcharging a bit ?

name brand RCA dont fix bad whine unless a shield is broken on the old ones. the path of the rca is more critical then brand names

broken ground shield shows up if you run a new wire outside the car, it can also be a bad pre amp portion on the amp, but rare!!

Spring&WateR Community Regular

Spring&WateR

Posted
Posted

hmm sounds like one of the cables is unshielded and or not shielded properly is it just buzzing or do you get like popping sounds as well ?

pipster11 Grand Master

pipster11

Posted
Posted

you could also check your ground wire

mate had the same thing cos he grounded it poorly

i had the same too now i think of it

  • 3 weeks later...
Crimpage Community Regular

Crimpage

Posted
Posted

Ground for the amp. Make sure you scratch away any paint that might be in between the grounding wire and the metal you are grounding it to.

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