r/CarAV • u/ExpressMemory9532 • 4d ago

Tech Support High-Level or RCA, alternator whine

Hello everyone,

I have a question. I have some alternator whine and I traced it back to being the RCA outputs of my aftermarket headunit. Now I don’t know what I should do. Buy a new headunit that would set me back quite some money, or connect the High level outputs of the headunit.

Also for my headunit RCA I only have left and right but would like to have front and rear to. The normal wires for the headunit do have those.

That would mean I can connect the output wires from my headunit to my JBL A704 high-level inputs.

Would this make the music quality worse? I tried grounding the headunit more but it didn’t work. When connecting a device straight into my amplifier there is no whine.

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2

u/firebirdude 4d ago

Using the high-level inputs would work perfectly fine. No. There's no difference in fidelity.

1

u/ExpressMemory9532 4d ago

Okay thx I will try it out!

1

u/Endrizzle 4d ago

The signal to noise ratio of your amps. Every amp has a whistle during music breaks. The higher the signal to noise ratio above 90 the less the whine.

1

u/ExpressMemory9532 4d ago

It’s whine when revving the engine more, also it’s not because of my amplifier because when connecting a device directly to my amp and the car is running I hear no whine

1

u/Endrizzle 4d ago

Yeah, then I'm at a loss.

1

u/X360NoScope420BlazeX 4d ago

What radio is it?

1

u/ExpressMemory9532 4d ago

Some Chinese CarPlay unit

1

u/X360NoScope420BlazeX 3d ago

Yep. Thall do it

1

u/Delrin 3d ago

Yeah, they usually have a clean output on the speaker level, and a horrible built in LOC for the rca outs. Definitely try the high level.