Instruct: Classify the given Amazon review as either positive or negative.
Query: Worked for about 45 minutes... then nothing...

What can I say. I wish I had read more online reviews before I purchased. When I received the package, I unpacked it, hooked it up, paying close attention to the wiring, and started using it. They DO sound great, but after about 40 minutes, they shut down entirely. When I called their customer service department, a Klipsch service tech said the problem was likely a blown amplifier, and I should return it. A pain, and now I'm stuck paying the shipping, I think....