Rick, Take a look at www.rythmikaudio.com. Brian caters to the DIY crowd and his design can hit 14 HZ. The site is filled with a lot of useful information. I purchased a kit over a year ago, and being too busy these days, just started construction a couple of days ago! The kits appear first rate. The woofer is custom built by TC Sounds. I can't imagine a better solution for both home theater and music. A big plus is a very reasonable cost factor. Steve