Here's the story: I'm interested in building a ported sonosub. I've fiddled with WinISD (although not in the last few months) and the ported.xls spreadsheet from www.diysubwoofers.org, and of course, reading through many posts right here. I'm considering the Dayton 12" DVC driver (not Titanic) and the Parts Express #300-792 156 Watt Amp. The JL Audio 12W0 driver is available in my area (Toronto) for about CDN$125. The parameters are as follows: Impedance: 4 ohms Fs: 22.10 Hz Qts: 0.429 Qes: 0.451 Qms: 8.974 Vas: 160.01 L (5.65 ft^3) Xmax: 8.636 mm (0.340 in) Pt: 125 W Alternatively, I could spend about CDN$200 for the Dayton driver, or CDN$250 for a Shiva. Using the JL Audio driver, I've generated some frequency response plots from the aforementioned spreadsheet, and they look fairly flat in the anechoic case, but if I consider room gain, there's a huge peak in the lower end of the spectrum (should room gain be a consideration in the enclosure design?) So, that's where I stand. The money wouldn't be such a big deal if I wasn't a full-time student in downtown Toronto. As I just started graduate school, I'll be a student for some time to come. Do any DIYers have an opinion on these ideas? -Nick P.S. Let me thank Dustin, with whom I've been communicating via email. He's quite an advocate of the DIY route, and seems to have ensnared another person (read: me).