They are really designed for I.B. or Reflex boxes. You would probably be better off with dedicated horn drivers . These usually have a higher Fs, Lower Qts and Xmax .
I believe Beyma & B& C make some good examples.
I can confirm that both the drivers you mention sound great in a reflex run 120hz - 2K. Look out for my new boxes with 4 x 8N515's
Tony
[email:2pxnki7c]info@forteaudio.eu[/email:2pxnki7c]