Question about Alpine 600W Class D Mono MOSFET Amplifier with Adjustable Crossover

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Amp Was Extremely Hot and I Have Now Lost All Sound

The other day I was running some intense bass through my Alpine 600W amp to my 2 10" Slim 1000W Kenwood Excelon subs. From the first day it was installed, I had a problem with the amp going into protection mode due to the gain being turned up too high. I had since turned the gain down about half way with no problems, although one hot day 2 weeks ago, I had the amp shut down due to overheating, turned off the power, turned it back on, and had it working fine again. However a few days ago, as I was driving, I could tell the bass was becoming more distorted, and a funny "aroma" was in the air. I can only describe the smell as being similar to freshly poured cement. Then, the sound disappeared. I went to check my amp, only to discover that it was extremely hot to the touch, but the blue power light was on, revealing that I was getting power to the amp and the fuses were not blown. I allowed the amp to rest for a couple of hours with no luck. It's been three days and I am still not getting any power to the subs. I attempted to readjust the amp's gain again by turning it down with no luck. Any solutions?

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Where was the smell coming from? The amp or the sub?

Do you have an ohmmeter to check to see if the sub's voice coils are still intact? Can you try driving the subs with another source to verify they are ok? We need to eliminate the variables here.

If the subs are okay then it's obvious that the problem is in the amp. I'm not sure if there are any protection devices internal to the amp, but I am sure if you remove the cover from the amp and if it was amp that was producing the burnt smell, you'll have no trouble visually identifying where the problem is in the amp. Most likely you'll find a part that is discolored or black & burned.

Usually a smell like this from a solid state device indicates a component has been overheated and if run long enough in this condition will fail.

- Jim

- Jim

Posted on Jul 07, 2008

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