I have not started to build 2Pi yet, because i am hesitating to
start may be with a dessign offering more bass.

I can't find any comments/recommendation of Beta-15 speaker in 4Pi.
Is there some reason I ignore ?
After last change of Eminence parameters, it seems that Beta-15
is quiet good replacement for oldest Aplha-15: require the similar box
dimensions and offer the similar bass response
(Beta-15 in 7cu ft has -3dB at 44Hz, Alpha-15 -oldestt- had
-3dB at 42Hz in 8 cu ft).
This is nearest than new Alpha-15 which require 11.5 cu ft.

Is there some sonic penalty for Beta-15 ?

Thanks in advance,
O'Tor.