I know it's very strange and I don't know what else I didn't try to eliminate this. Let me tell you some other things. When I connect hearphones there is no noise at all, I also connect it to amp (computer loudspeakers) which was not powered by a car battery and also there was no noise, and also tried to connect CD-rom to computer power suplly and there was no noise. When I disconnect CD-rom and amp I can still hear it but less. Another interesting thing is than ground output wire from CD-rom is not needed, I can just connect left and right channel to amp and sound is there.
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