More Stuff. Here's ported. We really see the Dayton and the SI screaming for larger enclosures with such a low tune, but this is kind of at my limits. The high-pass filter/ boost has a huge impact on port velocity. I was originally going to go with (2) 4" ports with elbows, but (2) 2x5" slot ports looks a little more appealing and the velocity is in check. I also tested these with different amplifier inputs should I get an iNuke down the road. It works well with that as well.
The only concern at this point I supposed is I think I'll be VA limited by the amp around 18 HZ or so, if only by a little bit.
Most impressive to me is that the 15" SI really holds it's own ported. If this simulation is accurate, it will provide reference levels of bass down to 16 Hz. The enclosure size is smaller and you're only giving up about 2-3 dB on the big boys.
7.0 cubic feet frankly is too large for me but that's where I have the limit right now. The Dayton really wants 7.5 and the SI wants 8.5.
8.5 Cubic feet + braces + driver + ports = huge enclousure, maybe 36 x 26 x 24.. dunno.
The 5.0 cubic feet Net enclosure for the SI 15" would be 30 x 22 x 20 including ports, driver, and bracing.