We finally settled on a shape that was the proportion of the Concertgebouw with the sloping outside walls, which the acoustician said were crucial to this and later decided they weren't, but now we have them.
Finalmente nos decidimos por una forma que era de la proporción del Concertgebouw con las paredes exteriores inclinadas, que el experto dijo eran cruciales para esto y luego decidió que no lo eran, pero ahora las tenemos.