Could you please tell me something about the 9Pi mid-horn for a 10" driver?

In an earlier post, I saw that it had an 18" x 18" mouth and a 4.5" x 4.5" throat, but I could not see the length of the horn (on axis).

1. Could you please tell me the length of the 9Pi mid-horn?

2. What is the intended frequency range of this horn with a JBL 2010H?

3. How does the 9Pi horn sound compared to the 90 x 40 mid-horn you use for the 7Pi audiophile version?

Thanks a lot in advance!!

Regards
Peter

Thanks a lot for your reply! Do you have a preference soundwise for one of the mid-horns when loaded with a JBL 2010H?

Thanks!

Regards
Peter

Thanks a lot again! One final question:

I understand that the 7Pi version uses no back chamber whereas the 9Pi version uses 80 inch3 back chamber. In plain words: what does it to the sound when you remove the back chamber?

Thanks!

Regards
Peter

The 9π midhorn (and its midbass horn) both have rear chambers sized specifically to peak near the lower cutoff of the horn. This is called reactance anulling, and it works something like the vent of a bass reflex cabinet. The rear chamber and driver system is tuned to peak at a low frequency where response would otherwise dip.

Thanks a lot - very clear and helpful as always!

Regards
Peter