I have been thinking about making an attempt at a DIY sub. I have a complete woodworking shop already so the wood tools and skills are not a problem. The problem that I have is if I spend any more money on my HT the wife is going to kill me (~about $4500.00) in the past 6 months. I currently have a Kenwood SW32HT Subwoofer that is OK, but not great. I also have 2 10" MTX Blue Thunder subs from a previous auto sub. I have been wondering if it would be possible to use the plate amp from the Kenwood (100 watt) and one or both of the MTX subs to make a decent sub for my HT. What do you guys think of this idea? Also where is a good source to design the cabinet? I have never done any speaker design so I am a total newbie to this. I have seen alot about the sonosubs, but that will not pass the WAF. I would need to cabinet to be reasonably sized. Any help with this would be appreciated. If this is a real bad idea please let me know so I don't go careening down the wrong road with this.