I installed new door speakers and a aftermarker sub to the existing head unit. Had no problem till a gremlin showed up and with all the door closed it picked up the motor rev only after 1 till about 1.5 with the door sensor open on one door it stops. Installed l7 12 kicker sub with class d kicker amp along with a jl audio line converter as well as kicker 6.5 door speakers. I think when the door sensor on it grounds the the whole car to the cluster gauges and stops the motor rev. I tried installing ground loop isolator and 12v isolator as well and nothing stops the motor rev in the sub except taking a door sensor and rigging it open. Anyone have any ideals on how to fix this.