Static from Rear Speakers

[JoeM 10+ year member]

Hi All.

I have a US Acoustics 4085 for my front stage, but as of right now, I've only installed the rear speakers (it's been cold, ok //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif)

Anyway, with the back speakers being powered by the amp, the front speakers are still being powered off the head unit. They are the oem speakers. Now, the rear speakers are JL XR650 CXi Coaxials. Throughout the volume range, I'm hearing a slight static noise under certain frequencies.

I think it may be a ground problem for this reason. I grounded to the seat belt anchor, but I didn't sand the paint off the anchor, or of the sheet metal its bolted to. I did the same grounding on my last car, but removed the paint, and it sounded perfect. No static, and those were much cheaper speakers.

Like I said, it's throughout the volume range, but it seems like it's only at certain frequencies, but I can't swear to that.

Can you good folks help me out.

-Joe-

p.s. The enclosure Jmac designed for me turned out great. It rattles my teeth with a USX 600D amp and a JL 10w3v2. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

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[ramos 5,000+ posts]

I believe you have answered your own question my brother. I would check all of your connections along the way to make sure everything is solid also. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[JoeM 10+ year member]

Originally posted by ramos I believe you have answered your own question my brother. I would check all of your connections along the way to make sure everything is solid also. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Yeah, I was just looking for affirmation from someone else. I know all the other connections are tight. I think....//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[JoeM 10+ year member]

Anyone have any other opinions on this? I'm gonna be trying to finish up the system tomorrow, and I'd hate to think i fixed the problem, just to find out it's got static.

My main concern is that the speakers are damaged. I did play them pretty loud, and I didn't hear static when I first fired up the speakers. I didn't hear distortion, in that the speakers weren't breaking up. I mean, i turned it up pretty loud, but not so loud that there was distortion. They were just playing loud and clear. My other concern is that the amp might be bad. I'm just looking for opinions.

Thanks.

-Joe-

 

[JoeM 10+ year member]

Anyone?

Bueller?

Anyone?

//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Sorry to be a pain.

 

[CarAudioAddict 10+ year member]

Check your grounds, if you didn't sand the paint there is high resistance at the ground point. Even if the grounds aren't the problem sanding the paint willaloow the system to go louder. I could get into electrical theory to explain this, but simply - resistance = lower voltage = less power.

If the static doesn't go away, hook the amp up to the front speakers but not the rear, and see if the static is still there. If it is, the problem is either in your amp, HU or signal path, If the static went away after hooking up the front speakers, then the problem is in either your rear speakers or your speaker wires.

 

[JoeM 10+ year member]

Thanks for the advice. I'll keep it in mind. My brain still tells me its the ground. I really didn't hear much static while I was driving tonight. LIke I said, it's subtle, not like the speaker is distorting.

Any more input is welcome. Thanks again.

-Joe-