CDA-7998 engine noice!

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=13522
Printed Date: June 01, 2024 at 4:46 AM

Topic: CDA-7998 engine noice!

Posted By: Roman
Subject: CDA-7998 engine noice!
Date Posted: May 14, 2003 at 1:31 PM

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

Replies:

Posted By: Roman
Date Posted: May 14, 2003 at 1:37 PM

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

Posted By: bberman1
Date Posted: May 14, 2003 at 2:06 PM

That’s a nice unit but this could be a tough problem to solve. First thing I would do is find a new ground behind the dash (just find some bare metal and sand it down and attach the new ground). If the noise doesn’t go away change the rca's around. Put the front right on the front left and the right rear on the left rear and see if the noise moves to the left side. Post your results

Posted By: Roman
Date Posted: May 14, 2003 at 2:39 PM

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

Posted By: Roman
Date Posted: May 14, 2003 at 3:15 PM

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

Posted By: bberman1
Date Posted: May 14, 2003 at 3:22 PM

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)

Posted By: Roman
Date Posted: May 15, 2003 at 3:14 PM

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

Posted By: bberman1
Date Posted: May 15, 2003 at 3:51 PM

Okay

Posted By: Roman
Date Posted: May 18, 2003 at 1:06 PM

Hey bberman1.I did change RCAs cables and now i do not hear any noise "yet" posted_image

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