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  #1  
Old 05-31-2013, 07:29 AM
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Question engine noise playing through subs

So I put my subs in the bed of my truck while I'm building my new box. They start spazzing out and my friend realizes it's with the engine. Why?

It's also happened with other subs I've put there before.

I also took them out. Put them in my tonneau cover. Set them on the ground. By the bed and by the door. Even in the passenger seat. Still did it.

I put in a 4 gauge ground in yesterday too. Is that possibly why? Grounded it to the battery.

Thanks.
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  #2  
Old 05-31-2013, 10:42 AM
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Don't ground to the battery and get a ground loop isolater.
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Old 05-31-2013, 11:52 AM
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Leave it grounded to the battery but install the ground loop isolator. That should solve your problem.

Is it actually engine noise that you're hearing or is it a humming sound that goes up and down with the RPM of the engine?
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Old 05-31-2013, 02:10 PM
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It actually does it when the engine is off too.

How exactly does a ground loop isolator work?
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Old 05-31-2013, 02:18 PM
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K, second question before we go further into this... did you run your amp power cable and RCA cables right beside each other from the front of the truck back to your amp? Or are they on separate sides of the truck?

Here's a link explaining ground loop isolators:

http://www.bcae1.com/glisoltr.htm
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Old 05-31-2013, 02:24 PM
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I have my power and ground running on the left side of my truck, same side as the battery. Ran into the cab, then around the back side of the cab to the amp behind the passenger seat. The power is wrapped with the plastic wrap protection stuff. The ground has no wrap.

The RCAs are with the remote from the radio to the amp on the right side. So yes. They are opposite side.

Then I have the speaker wore going from the amp, into a hole in the bottom of my cab the back up the side of the bed, through another hole. And then too the subs.

Also, I eventually got the terminal crimped on to a sufficient level. But what's the best way to attach terminals to heavy gauge wire?
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Old 05-31-2013, 02:31 PM
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Okay, well that shouldn't be a problem then....

How do you have your system tuned? Is the gain on your amp turned way up? The best way to tune a system is to turn the sub volume on your deck all the way up and then adjust the amp as required. The less gain (and therefore power) you have going to the amp the better. With less gain you wouldn't notice that sound as much either. But it does sound like you will definitely need the ground loop isolator as well.

If the terminal is crimped on tight enough where you can't pull it off then that's probably good. If it seems a little loose of you're worried about it soldering it is never a bad idea.
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Old 05-31-2013, 02:39 PM
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I can't tell you exactly how it's tuned right now, but it's the same as it was when it was in my cab. And it worked there.

So basically just muscle my way crimping it?
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Old 05-31-2013, 02:46 PM
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Okay, so you had the whole system hooked up inside the cab of the truck and it worked and then you moved the subs into your box and how you're getting the issue?

Yes, just crimping them as tight as you can should be enough. I have never had any issues doing that.
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Old 05-31-2013, 03:13 PM
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Yes. The only difference is a bigger ground, to a better location, aka the battery.

It has done it another time with different subs. I literally just unhooked it from my subs then ran a line out the door for fun and it started doing it. Hooked it back to mine and it worked fine.
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