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Romy, i hope this post doesn't offend your sensibilities.  I am not gonna say a word about the physics principles that have led me to the conclusion that this is something that should be tried ( unless you ask of course ). 

The idea i have is a speaker similar to your Macondo but with a few very important differences.  Instead of having having horns fire only forward i was thinking a second identical set of horns firing backward and electrically out of phase.  The ribbon tweeter would have a dipole design - i have developed a technology for such a ribbon:

http://www.diyaudio.com/forums/planars-exotics/154887-plur-2-evolution.html

( or whatever.  Borat = Me.  i am banned from Diy Audio now as Borat as well, so i can't see which is the last thread i had on that technology, but it is all boring and besides the point.  the point is that it is possible to build an open back symmetrical-front-to-back ribbon ( suitable for dipole use ) which would actually have a superior field to regular ribbons which is closed at the back )

ok and finally instead of the sealed bass i would have a dipole bass.

now subjectively everybody who has heard dynamic dipole bass, that i know of, has liked it ( when it is powerful enough, that is when the module is big enough ).  i also haven't come across any feedback that would suggest that opening the back of a ribbon would make it sound worse. the only real questionable aspect here is adding a second set of back firing, inverted phase horns.  mathematically speaking it is what the design "needs" but of course the real question is - what does it sound like ?  that's why i have to ask - has anybody tried this ?

has anybody tried a horn speaker with second set of horns firing back ( in or out of phase ) ?

has anybody tried a horn speaker with a dipole bass section ?

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