I purchased the amp linked below. Only diference is that mine is the 150W version which they don't seem to ahev listed anymore. When I plug it in, with the switch in the off position, a red light comes on and remains on. When I switch it to on or auto, a green light comes on. I plugged my coaxial subwoofer receiver output into the "red" line in coaxial plug, and hooked up my base shakers to the high level output.... nothing happened. I tried several shakers just in case it was the Aura base shaker. My original subwoofer works fine, and when I hook the cable from the "line in" into my other subwoofer it works fine. It seems like the amp isn't working. I don't think there should be a constant red light in the off position, and when I plug it in or turn it to the on position, it doesn't seem to make any noise or get hot. Any suggestions?