HELP, The front speakers go mute when engine turns on

i turn the engine off again, and the front speakers come back


i tried three different grounding points for my amp ground wire
i even shortened grounding wire from 3 feet to the now 1 foot

i re-did the power cable at the battery connection point so it is very nice

why do i have this problem? am i suppose to just listen to the music with
teh car stopped and without the engine on?



i split rca cables from 2 channel to four channels so my headunit just
has fade to rear like it is suppose to be HOWEVER if i fade it all the
way to front i get some distorted sound in the front right one even
though there is not suppose to be anything giving power to that front
speaker


it just seems all strange to me



well anyways i keep it to fade rear and it works fine when the engine is
OFF

wtf