Yesterday, I just DIY install sub + amp to my proton preve.
Everything goes well. when i test the unit, the sound is ok. but i forget to test it when engine running.
just test it when acc on.

then after re-install back all panel, hu, do proper wiring..

then i start the engine.
the sub humming very louder for 2 seconds.
it not happen every time i start engine.

just out of 5, 3 happen.

anyone can help me?

i search google. most of them ask to try check my grounding back.
or check my rca converter back.