Just pulled the trigger on 2 Ultras. I would really like to put together the optimal vented system with the drivers, enclosures, and the crappy space I'm putting them in. TC Sounds site shows a couple of different vented enclosure sizes spec'd for the Ultras. 6.4 cubes at 20hz and 8 cubes for 15 hz. My current subs fire to the front and vent to the sides. I would like to vent out the front on the new set. Has anyone built a vented Ultra or at least modeled a set?
Playing with winISD a bit - 7.8 cubes at 16hz is about as nice as I can make it look on paper. As far as I can tell, I get the same exact thing plus 3db with 4000w as opposed to 1900.
Here's what I have for LFE:
2 18" LMS Ultra, 2 EP4000, and a Reckhorn B-2 for HPF. The room is 12x22 swiss cheese with doorways, windows, vaulted ceiling. Enclosure has one place to go, under the screen, 7x2x2, 6x2x2 would be best for aesthetics. I am replacing a set that occupied the same space. I am ready to sell the EP4000s and order the fp14000 if that is what I need. I am also wanting to replace the Reckhorn with a more accurate unit with a HPF and EQing. Something from minidsp.com maybe?
Here is a 3D rendering that I created in autoCAD for reference