How can I cure my noisy car speakers - I have an Eonon E0851, fitted in a

[geraint w]

Mitsubishi L200? I have installed properly, watched the video on Youtube and read Instructions.
The ground appears to be ok, but just cant budge the annoying whine!
Help me

 

[scaniatcab]

if you have used the car body as earth,then remove this and run a separate earth wire to each speaker.

 

[jimmy g]

Either put a frequency transducer in the stereo or replace the spark plug wires.