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Question: Can anyone tell me why the left speaker on these stops working?

Only 12 months after I bought a pair of these (exactly when the 1 year warranty expires!), the left speaker on a regular basis, after just a few minutes of listening at moderate volumes, dropped down in level by about 10db below the output of the right speaker, causing a severe and distracting balance issue, that can only be remedied by turing the volume knob way up on the right speaker (the speaker which houses all the inputs, outputs, and amplifier stages). That would temporarily kick the left speaker back into gear and resolve the balance issue, but the problem will return with a few minutes of listening at regular volumes. I am an audio engineer who troubleshoots complex audio systems on a regular basis, and trust me, I eliminated the possibility of it being a bad cable or audio source. These speakers are cheaply built and I don't trust that they'll work for more than a year or so. I called and the technical support personnel at Alesis did nothing to help, except direct me to take them into have them fixed on my own dime at an authorized repair facility two states away, in New Jersey! (I live in Massachusetts).