DIY sucks!
How much is your time worth to you? I get paid like $20,000.00/hour and even after a lot of practice, it would take me like 12 hours to build the sub, not to mention the 60 or so hours that it would take me to research what the best driver and amp to use was. That's like $1,440,000 it would cost in just build the sub. I could buy like 72 SVS Ultras for that! In my 10'x'13' room, only 72 SVS subs could get me the bass I'm looking for. No way would one DIY sub do it.
And do you really think that you can build a better sub than SVS? They've been doing this for like 30 years! They have so much research invested in this. And it isn't just them, they got the best TC drivers, and all of TC's research. And they got Bash amps. There is no way that any DIY can compete with that.
And don't get me started about IB. What a joke! Cut a whole in your wall and put drives in garage? Yeah, like that would work. The mice in my garage would eat the drivers for lunch! And, how the heck do you change the tune of the sub? I can have my choice of 12hz, 16hz, or 20hz. You can't do that with a IB!
HA! You Suck!
Note that is a joke. See my twins:
http://www.htguide.com/forum/showpost.php4?p=228946&postcount=1