Two years to the day, my NHT SW10 subwoofer broke down. When hooked up to the preamp output on my receiver it only gives out very slight sounds. I then hooked another pre-amp to my receiver and hooked the subwoffer to the preamp. If I turn up the volumn very high on the preamp, I am able to get what appears to be , fairly good sound out of the subwoofer. (I have tried the subwoofer on several different receivers and amps, with no luck). I really know nothing about the inner workings of a subwoofer. I do know that to take it in will cost $50-75 just for the diagnosis. Is it worth it for me to try and repair it or am I better off just dumping it and buying a new one? Any help would be greatly appreciated.