Question about JBL BP1200.1 Car Audio Amplifier

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Car amp hi there dynami like i said i chec...ked everything even put the ground direct to the bttery(new) figured that would eliminate my ground doubts..but ya like u guessed i got no manual with this hopefrully not fried any other ideas?

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  • Dean
    Dean May 11, 2010

    hi there wat is your problem with the amp it doesnt say?

    it is a bad idea to earth your amp from the battery itself.

    If you can give me some more details ill gladly help you :)

    Upfront Audio


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  • Master
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Wht is it doing

Posted on Jun 26, 2009

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Well i used to have this really bad guitar that has this grounding problem (humming all the time unless u lower the tone or touch the strings or any metal object on it) well i always blamed the guitar for...


Hi,

This would only mean two things:
1. you have a bad capacitor in the circuit or the grounding on the circuit is broken and not filtering the obvious line noise from the circuit.

2. You have what is called, dirty power. That is when you have some kind of electrical device plugged that generates line noise which can be even a florescent light as they generate line noise.

Please take the following steps to narrow down the issue.

Take your setup and plug it in some where you know others can setup their rigs and it is using clean power. If, the humming goes away then it is dirty power where you originally setup.

If, it is still humming then you will need to take your equipment to a qualified marshall dealer have them look at it.

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Hi there just picked up a jbl bp 1200 for good price although just wired it up and turned the key to find the red light come on few seconds then solid green and no sound...checked ground,remote wire rca...


Most amps do a "power up" where all the lights can come on, then settle into "green light" or some sort of "ready status" light comes on. The red or yellow lights can indicate "protection mode" (a bad amp) and green is the universal signal for okay. - So try this - Double check your connections and the amp. Pay close attention to the settings on the amp before you declare it not working. I have had many amps (especially newer ones) cause problems from a simple switch that was in the wrong position. Be sure to use good power and audio cables matched to your amps capabilities with good strong grounds on a clean non-painted metal surface. If all is in order from there start checking your signal from the deck to the amp. You can also check manufactures website for the manual, (if you didn't get one) looking at it may give a clue about proper switch configurations and hook-ups. Let me know if you need additional info concerning these idea's.
-Dynami

Apr 15, 2009 | JBL BP1200.1 Car Audio Amplifier

1 Answer

2005 silverado trailer wiring


You may want to get a ground loop isolator or even cheaper. Go to radio shack and buy two 1amp diodes and put them on each turn signal wire. This will eliminate the problem. The diode will be black with a gray line. the line will go towards the trailer on each wire. this should take care of the problem.

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1 Answer

Amp doesnt turn on.


it sounds like it is blown..one way to test it is put the remote wire and the power wire together and put it to the possitive of a drill battery and the put the ground to the nagitive at the drill battery..if it goes right to protect then it is blown!

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Cerwin Vega ve-28s subwoofer and new Cervin Vega 2-way satellites


I bought my VE-28s and it did exactly that crackled, cerwin replaced part in amp but few months later problem persisted. they then replaced entire amp assembly and its been fine. i really push it to and its been fine. to test it, unplug the connection from amp/ reciever and see if it persists. if so its the sub, if not its the amp/ reciever. dont dump it, these subs really crank and can put out some deep loud bass.

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