[scathontiphat]

4 ft^3 with 18Hz tuning definitely looks good in my sims (not sure if i'm doing it right though, as it looks significantly different than thxgoon's plot).

Couple questions on it.
1) what are the ill-effects of this higher tuning?
2) Is the tuning low enough to get away without using a high-pass filter? Or do I need to worry about the woofers unloading?
3) With 4 ft^3/18Hz, group delay crosses 10ms at ~28Hz, and it's up to 27.5ms at 20hz. Is that still okay?

attached are my plots for 5ft^3/15hz (grey) and 4ft^3/18Hz (blue).

thanks for the help guys! Can't wait to get to some building!