CDA-7998 engine noice!

Hi guys! I need help plz! I changed Sony head unit:CDX-M730 for CDA-7998(Alpine) and i have this set up: Speakers Front: SPR-176A (Alpine) Rear: SPR-694A (Alpine) Sub: SWR-1541D(Alpine) Amplifiers MRD-M300(Alpine),MRV-F340(Alpine) So i install my new CDA-7998 and i have engine noice in right speakers(front and rear)even when i turn key in first position i have some noice like (tik tik tik tak tak )but only in rear rignt and when i turn key to ignition position both speakers(rear left and front right)start to hiz.And when i start the car the engine noice coming.I didn't have this problem with sony may be i did cople of times but i thought that it's because i put ground wires from both amps to the same whole that i make so i separated them and i never had any noices ! The RCA cables are Philips not very expensive but not very chip.This noice drives me MAD! Plz could you help me. Thank you very much

I mistyped: only right speakers (Front and Rear)making noise

tough problem to solve? Wow Alpine starts to give me a head akes.It's a new car,bberman1 do you think the ground is no good?Ok i am going to check everything but it's not easy i have to take out panel(trouble)may be could we start to change the easiest answers? thank you bberman1 i will start to check .... Thank you

I just noticed that speakers that makes noise play not that loud that speakers without noise.Is it CDA-7998 faulty?

It’s a possibility, but try what I suggested above with switching the rca's around. It will tell us allot (you can do that from the amp rather then from in the back of the dash)

Hey bberman1. I checked RCA cable....99%they are causingthe noise. I just took all of them out and to use one pair of"very cheap" RCA cablesfor to check channels in turn and none of them were making noise! So tomorrow i am going to buy new pair of RCA cable.I will let you know how it goes after i have them installed. Thank you again. /////ALPINE

Okay

Hey bberman1.I did change RCAs cables and now i do not hear any noise "yet" But i have one question : What Xovers.EQs are the best to use ,on amplifier or on Head unit and what should i set them to for best SQ? Thank you/ / / / / ALPINE