Question about Kenwood KAC-9152D Car Audio Amplifier

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Hey hello there i thought id ask you as u seem to have the best idea,basically i am using the kenwood monoblock amplifier 1800watts,when i am playin music loud for about 5-mins the sound cutts off and the red light goes out on the amplifer,however the blue light by the fan and the dials stays on,so its not a problem where power gets cutt of to the amp,but i thought it may be because there is not enuf battery power so i bought a 5 farad power cap and it is still doin the same thing,any i deas?i reali appriciate this thaks

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Since I do not have the amp opened up on the test bench and connected to be able to take readings, I can only speculate.

It is obvious by your description that the amp is going in to protection mode. It is possible that the total impedance is too low, or that the amp is being over driven.

If there is some distortion occuring especialy at a high level, the amp should go in to protection mode. It is also possible to have some defective components that are making the amp too sensitive to go in to protection mode. I have also seen defective components intermaly in amplifier units that have caused the power supply to go in to the protect mode.

I have seen defective crossovers in speaker units also cause an amplifier to go in to protection, or even be damaged. If the crossover has the type of defect that is causing an impedance missmatch or be in a low resistance, this can cause the amplifier to go in to protection.

You will need an experienced tech who knows the model of amp very well, has the instruments, and has the service mauals in order to be able to go through it to find the exact fault.

Considering the circumstances, this is the best I can do for you.

Jerry G.

Posted on Jun 11, 2008


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As for the amp shutting off for a few seconds, it sounds like it's either:
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B) Overheating.

The cap on the +12V to the amp should help, but putting a meter on the +12V might tell you whether it's dropping too low (<11V).

When you first turn the volume up, how long does it work fine before shutting off? Is it with the vehicle running or not?

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