Subs make loud roaring sound when connected... Help?

[riddledmaddness]

I just bought a used 99 Ford Taurus and wanted to install some subs that I used in my previous two cars. However, when I got everything hooked up and attached the power cable to the battery the subs fired up with no music and made a loud roaring noise (feedback I'm assuming?)

I have two 10inch Alpine Type S Speakers and I use an Alpine MRP-M350 Amp.

This setup worked just fine with the other two cars I used it in, however I used aftermarket head units in both of those cars, and this time I am using the stock head unit. I knew I'd have to get a line out converter so I bought an Install Edge IEC AULOC from Best Buy. I hooked it into both my rear 6x9 speakers and ran the RCA cables to my amp. The ground from the amp is attached to the chassis by a bolt under the trunk carpeting.

I'm pretty green when it comes to this stuff. Any help would be greatly appreciated... //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

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[audioimpactxx]

In most cases you do not need to Ground the Line Out converter, however I don't see that having anything to do with your problem. Is it something that happens constant when you leave the battery cable attached, or only for a split second?

 

[riddledmaddness]

It's constant. If I leave the amp powered by the battery and remove the RCA cables, then the sound stops. As soon as I plug them back in, the loud roaring starts back up.

 

[DJSEVEN 10+ year member]

It's constant. If I leave the amp powered by the battery and remove the RCA cables, then the sound stops. As soon as I plug them back in, the loud roaring starts back up.

riddledmaddness

I get the same thing with my car I have a Pioneer aftermarket head unit and I think its this source that is causing it.

I am going to try and fix by grounding the RCA connections on the radio . I will let you know if this works.

 

[DJSEVEN 10+ year member]

OK I just fixed it...did 2 things. 1 i wrapped wire around the RCA inputs and grounded them to the radio and then I noticed my radio was not even grounded so I did that as well and bingo....Loud Roaring abnoxious sound gone!! WOW Ive been dealing with this for a year now....GLAD ITS GONE