Problem with noise from new amplifier

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Problem with noise from new amplifier

Hi there

I've just install a new amplifier by myself, but I got some problem

When the engine off, everything seems OK, but when I turn the engine on, there are some noise from the speaker when it will vary when speeding

I removed the paint to connect "Ground wire", but nothing change

I connect the amplifier to noise suppressor --> nothing change

I adjust the "Gain" control to the min, the noise disappear, but now my subwoofer useless, can not hear from it.

So, please tell me how to fix that problem

I read some articles saying that it comes from poor ground. How to make a good ground.

Thank you very much


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