Are there cheaper amps? The only reason I'm considering this is to try to get a great performing subwoofer for really cheap (and without the hassle of DIY'ing an entire sub). I don't see a point in paying $800 for a turbo kit. For all that money and work, I'll just buy a completely new sub like the HSU VTF-15H which will be new, with warranty, and have around the same performance. I find $350 for an amp to be really expensive for a subwoofer repair like this. Is there something cheaper?