electrical noise

I apologize, but I am once again asking for assistance on this issue. I think I have tried everything I've been told. System Rundown: 2002 Saturn L200 •Electrical is a powder coated mechman 260 amp alternator, battery is a XS Power D3400. I have 0 gauge ofc big 3 •Stereo is a JVC KW-M780BT •...

Hello, so I have had an amplified system running in my car for around a year now with no issues. All the wiring is fine and all the grounds are firmly secured to the chasis. however a few weeks ago i started my car and noticed a whine coming through the speakers that changes with engine rpm...