Here is my Problem. My system

HU > Pre-Amp > Amp > Passive Crossover > Speaker

My problem is that when I start my car's engine, there is a noise interfering with my sound. It follow the RPM of my car.

At first I though there is a problem in the HU, Just a couple of hours ago, Ive change my HU unit and the same problem still occur.

Usually noise interference is related to grounding problem. But Ialready tried grounding the HU to the chasis of the car, and even trying to ground it at GROUND nut still to changes (Sigh)

Any of you guys ever experience this problem before? Any recomendation in eliminating/reducing this noise since its becoming anoying already. Should I install a Voltage Stabizer?

Need some help here

check you wires and its route
most probably noise induced in the wires than anywhere else

Which wires? Grounding? Live? Negative?

power cable to amps
wire from amps to speakers
wire from HU to amps

check ur rca cable path and make sure it's not rolled/loop together.....

what about ur spark plug cables?
checked whether maybe got 'bocor' or u changed to non oem spark plug cables.

Wow? if the cable loop will cause noise? this noise is the same as my engine rpm.. the more rpm the higher the pitch.. btw interesting fact since i rolled/loop together my rca cable from HU to Preamp.. i'll try too unloop it and post the result here..

Thanks for your advice



I already use spitfire spark cable.. so i dont think thats the problem.. my deduction either the RCA cable/grounding/alternater since the noise follow my engine RPM..

BTW thanks for ypur advice will post some result soon.. I'll let u guys know tomorow.. will take off my HU and rewire once again

Done some rewiring couple of days ago and the result was superb no more noise in my system..

so happy right now.. i think mod can close this topic as the problem solved..

thank you so much for your guys oppinion and help apreciate that

mayb the problem is cause by ur spitfire spitfire?

plug cable is well known for causing aeroplane sound