Thanks for the quick and detailed response!My application: I'm looking for a mid to match up with my existing 12" subs. I'm considering 2 options:
1) sealed box mid (Q.707) crossed actively at 80 Hz
2) vented midbass getting down as low as 50 or 60 Hz
#1 allows me to stuff the box and kill the back wave
#2 will probably give me better bass as I don't think my subs are that great in the upper bass
Thoughts anyone?