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