Amp makes wierd droning noise
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=33589
Printed Date: May 14, 2025 at 7:45 AM
Topic: Amp makes wierd droning noise
Posted By: scetch50
Subject: Amp makes wierd droning noise
Date Posted: June 09, 2004 at 7:13 PM
OK- so I have a JBL BP.600 hooked up to a Audiobahn 12 in DVC sub rated at 700 watts rms. It wired to 2ohms. Anyways its been making this very low (in tone) droning noise when i drive over uneven or bumpy pavement. I've checked all my wiring, adjusted the various input levels to no avail. I contacted JBL and they said it could be a crack or loose connection in the amp. However, I was also reading online about some sort or crossover protection. Does anyone have an answer to this, or know what crossover protection is? thanks- MIKE
Replies:
Posted By: stevdart
Date Posted: June 09, 2004 at 8:57 PM
Crossover setting wouldn't be the issue...you have an adjustment control on that amp. I would try duplicating the sound while you're standing at the rear of the car, because you can tell things a lot better if you're not driving at the time. Shake the box, bounce the car, something. Narrow it down.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: scetch50
Date Posted: June 09, 2004 at 9:11 PM
thanks- I tried what you suggested and bounced the car and shook the box and again it made the noise. However i am still bafled by the cause. The JBL tech guy suggested it may be the lifted trace or a crack on the PCB. I have no idea what that means but he said it would have to be sent in to be fixed. Does anyone know what that is and or have they ever had that problem with an amp?
Posted By: stevdart
Date Posted: June 09, 2004 at 9:25 PM
The sound comes directly from the amp, not the speaker? Disconnect one of the speaker leads to isolate the amp, and not the sub or encosure as the problem. Run the amp as normal. Are you getting a sound?
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: scetch50
Date Posted: June 09, 2004 at 10:46 PM
ok i disconnected the sub...no sound. The sub runs normally until i bounce the car or shake the box. Then the sub makes this monotone reverb kinda tone over the music. After i stop it continues to play as normal. My amp is mounted to the enclosure. I could try taking the amp off the enclosure and ina sense isolate the sub to the vibrations. thanks-Mike
Posted By: customsuburb
Date Posted: June 10, 2004 at 9:06 AM
Yes, try moving your amp off of the box as far away as you can and see if the noise returns. You might want to check your ground also.
Posted By: scetch50
Date Posted: June 11, 2004 at 10:09 PM
so i checked the ground and took apart all the wiring an re wired it. It seems fine now. I have been driving around for a couple days with no problems. However, my JVC Kameleon volume button sticks so i may be getting a new HU and not a new amp.
Posted By: stevdart
Date Posted: June 11, 2004 at 10:33 PM
I noted this post in the recent thread about your deck. "Those kameleon decks where riddled with problems. We get so many back for service calls that it's disturbing. My suggestion would be to get rid of it and get something else, cuz once you get it working again, it's gonna break again."
(silversi17) ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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