Not sure why this combination isn't more popular with the Klipschorn modifications folks. The horn has a specified Fc of 400Hz and, based on the on-axis response plots the compression driver works well into it. The plots clearly show the driver is working into a reasonable radiation resistance to about 350Hz making the combination suitable for pairing with bandwidth restricted Klipschorn bass unit. FWIW, it blows the stock unit away, mids are crystal clear (no "shout").
Insert_Faital.png
Here's the plot of the mid-horn without a filter (green) and with a 400-6000Hz band-pass (gold).
B&C_net_1.png
Plot below shows the on-axis response of the mid-horn (gold) and tweeter unit. The green response is the integrated response of the two.
B&C_insert_1.png
The baffle insert was compared to the Klispchorn unit and evidenced a significant improvement.
MOD_2_factory_insert.png
Stretching grille cloth has a satisfying effect. A good pneumatic stapler helps to do this right (for me anyway).
Insert_with_grille_1.png
Insert_with_grille_2.png