Hi Wayne,
First of all Congratulations for the success of the Great Plains Audiofest and the excellent pictures.
This question has a little to do with the 12π Basshorn Sub. Is the push-pull bass system philosophy a little similar to the isobarik? You have your speakers in two different chambers (in the 12π basshorn sub) and isobarik the speakers facing each-other? But forget the vocabulary and the arrengements, does it work in the same way? Thanks. I think your 12pi basshorns take a long time to appreciate and maybe one day I can also listen to them... who knows?Psychoacoustics - I have been following the discussions on this forum about "psychoacoustics" and the (good) effect of wood (and bronze by the way) in electronics and acoustics.
This is another web site that most of us might have found allready;
"Dieter Ennemosers C37 Theorie" ...and the wood-cone speaker design patent(http://www.ennemoser.com/index.html)