[JohnR]

Hey speaker builders, check this out:

http://redspade-audio.blogspot.com/2011/09/synery-horn-now-up-and-running.html



  

[srb]

Interesting that the LF drivers are each firing through two small holes.
 
Steve

[JohnR]

There's a reason for that, although frankly the technical explanation is beyond me. They go down to about 200 hz.