Well, my 8 year True Sub's active woofer has started to blat on low tones. It has developed a big wart on the driver where I believe years of misting of the plant sitting next to it has taken it's toll. In reading other accounts it looks like Sunfire will want $600 for the replacement woofer since it's custom. Has anyone tried fitting in an off the shelf 10" driver in a True Sub? I'm willing to try that first before running off and getting an SVS or Hsu.