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<blockquote data-quote="DOOM_NX" data-source="post: 5844012" data-attributes="member: 602868">Hello.I know this question has been asked many times before, but I just need your opinion in this special case:I got engine whining noise (like a small turbine) that varies with engine&#039;s RPM coming from the tweeters.This happens only when the engine is on and the headunit volume is at anything but &quot;00&quot;. &quot;Mute&quot; option also doesn&#039;t make it stop.If I stress the battery, for expample if I operate the electrical windows, turn on the headlights and press the brake at the same time (lol), the whining doubles or triples in volume.And, finally, something came to my attention recently: Normally, I connect the HU output to the sub amplifier input. Then from the sub amplifier output to the speaker amplifier input. If I connect the RCA cables from the HU directly to the speaker amplifier input, then the problem goes away.You would obviously suggest a Y-adapter, but I wanna make sure my sub amplifier isn&#039;t faulty.Do you think the integrated passthrough circuit is the culprit? Or maybe a bad ground?Both sub and speaker amps are grounded at the same point (a screw below rear seat)Please, any ideas?Thanks in advance,DOOM_NX</blockquote>

[QUOTE="DOOM_NX, post: 5844012, member: 602868"] Hello. I know this question has been asked many times before, but I just need your opinion in this special case: I got engine whining noise (like a small turbine) that varies with engine's RPM coming from the tweeters. This happens only when the engine is on and the headunit volume is at anything but "00". "Mute" option also doesn't make it stop. If I stress the battery, for expample if I operate the electrical windows, turn on the headlights and press the brake at the same time (lol), the whining doubles or triples in volume. And, finally, something came to my attention recently: Normally, I connect the HU output to the sub amplifier input. Then from the sub amplifier output to the speaker amplifier input. If I connect the RCA cables from the HU directly to the speaker amplifier input, then the problem goes away. You would obviously suggest a Y-adapter, but I wanna make sure my sub amplifier isn't faulty. Do you think the integrated passthrough circuit is the culprit? Or maybe a bad ground? Both sub and speaker amps are grounded at the same point (a screw below rear seat) Please, any ideas? Thanks in advance, DOOM_NX [/QUOTE]

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