Question about JBL BP1200.1 Car Audio Amplifier

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Jbl amp kiskcs in and out

My amp will work good for about five min. the led light will always stay green, then my subs will have a cracling sound and then nothing will come out of the amp the subs are perfectly fine. i had them tested but amp doesnt work. if you hit the amp somtimes it will kick back in again and work fine ? how can i fix this

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Something inside the amp is busted.... stop hitting it... and replace it.

Posted on Jun 19, 2008

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Have you tried it with something besides the Ipod? A sub isn't supposed to reproduce a full range signal. Come to think of it, is the Ipod even outputting anything within the sub's operational range? I don't expect a lot of real bass comes out of one.

Perhaps you could try adjusting the Low Pass up to 180 to see if anything anywhere near the 'real' bass region is present.

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Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.

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>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<

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-----

For hum problems, even those you cause yourself:

Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.

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