I have noticed a soft clicking sound that is only happening when the stereo is on. It seems to be coming from the dash around the bottom left corner of the windshield and is not effected by the volume control. I do have an aftermarket stereo installed with what I believe are stock speakers, but I don't know much about it as I did not install it. Any ideas or starting points would be helpful. I'm a bit of a novice at stereo work, but I've done some basics and am keen to learn. Thanks in advance!

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Also, it is a fast continuous clicking. Almost like a second hand on a clock running about 4 times it's usual speed.

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-pdub77