Let me start by saying that I built a pair of Wayne Parham's Theater 4 Pi speakers (a now-discontinued model) years ago, and I fell in love with the dynamics. I always figured I'd build the fully upgraded JBL version when I got around to building a theater. Well, many years have gone by, and there are now a lot more options.
I've been eyeing the SEOS builds for over a year now (especially the Tempest), but I kept wondering how they'd compare to the JBL/B&C 250 4 Pi speakers. Now it looks like the AE mids are the drivers to beat.
Anyway, whatever I build will be used as LCRs behind an AT screen; about 80/20 movies to music. I'll likely power them off a receiver (Denon, Marantz...?) with Audyssey XT32. I understand that they couldn't really be run full range, and I'm fine with that. I plan to run them with four SI 18s each in a 16 cuft enclosure tuned to 16 hz. Lastly, the room is about 6000 cuft. On to the questions.
1. I haven't seen anyone who heard both the Tempest and the DNA360/TD12M. Any comparisons? The price difference isn't too much for me to be concerned about, but is it worth the difference in price and hassle (since I can get the Tempest as a complete kit with assembled crossovers).
2. One thing I really like about Erich's offerings are the CNCed baffles and flat packs. How would this setup work with the 2 cuft flat pack? I'm guessing it would net about 1.5 cuft after the CD, mid, and bracing (unless the bracing is already figured into the size of the flat pack).
3. John Janowitz recommended somewhere around 60 hz tuning if crossing over with the subs at 80. Does that sound appropriate? Would you recommend something different assuming I use the 2 cuft enclosure? I'd probably use three round ports (like the Tempest) for the sake of ease. What length would those port tubes need to be based on that tuning?
4. Anyone happen to have some leftover TD12Ms from the group buy?
5. Is there anything else I should consider? Any help is appreciated.