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This review is from: Pyle PMX401 4-Channel 150 Watt Powered PA Mixer/Amplifier with Independent Channel Control and Audio Line Input (Electronics)
Exchanged this amp three times. Within a week that I had all these amps, it began randomly cutting out after it was turned on for a few hours. I had one mic in use and gains set midway. Sitting and not in use it would begin cutting in and out as soon as I used it. In one of the amps, I could smell something burning. The price is cheap, but the problems make the amp unusable for me. I have to say that Amazon.com replaced these amps within a week, and their on line return policy is fantastic, with free return postage if returned within 30 days. After the third amp failed, I decided to go to a bigger amp, the only problem is that it is also manufactured by Pyle Pro, but I'm sticking with Amazon.com. I can't begin to tell you the problems I had with Sears.com when I tried to return an item they sold me.