I just bought a new shelf audio system, and it came with a subwoofer. I tried the system with a variety of cables and speakers, but for some reason, the sub (green light) comes on for about 10 seconds, and it works, and then it goes red, and the sub shuts off while the system is still on. I just bought it yesterday, so I can still return it to the retailer, but does anyone might now why this is happening? Thanks!
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