loud high pitch noise

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xasterus

Member - Posts: 3

Joined: September 05, 2006

Location: United States

Posted: September 07, 2006 at 11:07 PM / IP Logged

I have a 1998 mits eclipse

I have a dual head unit

I recently put in 2 10" p2 rockford punches and a rockford 201s amp

That is when this problem started

I hear a high pitch noise, that gets louder with the engine rpm, when the volume is on 0 it is realy loud but if i turn it to 1 then the noise is quieter but still present.

any and all help will be appreciated

KarTuneMan

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Joined: December 14, 2004

Location: Isle Of Man

Posted: September 07, 2006 at 11:21 PM / IP Logged

Acoustical tachometer. Good ground for the amp?

xasterus

Member - Posts: 3

Joined: September 05, 2006

Location: United States

Posted: September 08, 2006 at 10:34 AM / IP Logged

Yes, the ground is under the mat in the trunk.

Well I think its a good ground, I took sandpaper and sanded the paint off around where it was going to be so it should be a good ground, i have changed it since i put it in and the noise is still there.

caraudio904

Copper - Posts: 115

Joined: August 30, 2006

Location: United States

Posted: September 09, 2006 at 4:22 AM / IP Logged

Try a noise suppressor* or whats called a ground loop. I've had some success with those. Or even try to just rig a little peice of wire around one of the RCA terminals an then ground that wire, that has works more than once for those low budget customers. But the last thing I had an amp that was just plain out busted on its last leg an it made that noice no matter what. It wasnt my ground or anything it to took a power surge (a guy crossed my speaker terminals) an it just drove me crazy so I threw it in the trash

Southern Stylez

Jacksonville, FL 32218

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Joined: November 01, 2003

Location: Alberta, Canada

Posted: September 09, 2006 at 5:48 AM / IP Logged

Chances are in this case that it is the ground isolation circuitry (or lack thereof) in the cd player. Rockford amps have a kill zone called a Topaz circuit. Read the what is a proper ground sticky and follow the suggestions. A good ground is not just a sanded down piece of metal. Retest with a friends cd player as well. (and not a Pioneer with the same known issues).

Top Secret, I can tell you but then my wife will kill me.

xasterus

Member - Posts: 3

Joined: September 05, 2006

Location: United States

Posted: September 09, 2006 at 9:51 AM / IP Logged

Thanks for the help I will try that.

I am taking an automotive wiring course and i asked my instructor about it and he said that i was hearing the alternator and that a capacitor would fix the problem any thoughts on this???

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: September 09, 2006 at 10:23 AM / IP Logged

A noise filter (made from a capacitor) can mask this sort of problem, but not solve it. Plus a filter will never make it go away, it will always be there just at lower volume. You need to properly ground your gear, set your gain correctly, and maybe replace your head unit.

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 23, 2006 at 1:08 AM / IP Logged

The problem lies inside your head unit. The shield of your rca jacks need to be grounded. A temporary fix for your problem would be to take a length of 18 ga. wire install a fuse holder with a 1 amp fuse in it ground one end and strip about 3 inches of the other end and wrap this around the outer metal part of the RCA jack you can do this at the radio or at the amp.

Your radio recieved it's injury in one of these 3 ways

1. A 12 volt wire touched the outer part of your RCA jack 2. you connected the rca and the power wire to your amp before you connected the ground wire which caused your amp to look for ground and found it via your rca jack which could not handle the current. or number 3 which is the least likely, your amp has an intermittent short in the transformer which will put 12 volts on the patch cords this is why we put the 1 amp fuse on the wire we installed. if that is the problem it will just blow the fuse and start making the noise again.

jettagli03

Copper - Posts: 311

Joined: January 16, 2005

Location: United States

Posted: September 23, 2006 at 10:38 AM / IP Logged

It is a Dual head unit and that could have something to do with it, extremely high quality they are, but I would check the ground with a meter to check if it is a good ground before I did anything else.

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loud high pitch noise

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