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Hello, no joke!
please read in the middle: http://www.hm-moreart.de/11.htm
look the double horn constructions with measurements, Saxophon Trombone Posaune Kornett SUB Fanfare RDH20
best documented the Cornet: http://www.hm-moreart.de/104.htm
look the measurements of the SAXOPHON, better as can be!! no joke. http://www.hm-moreart.de/86.htm
i take the BG20 only invers as a back driver, not
listenable from listening position,
but bass by horn mouth distance and membran movement cross setting with the front driver.
DIY Horns
http://www.hm-moreart.de/1.htm
less is more
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