Need help with this horn and lens

[Jbl4345fan]

JBL 2309/2310. Not to much info at least I could find. But here it is. I want to use a radian 951bepb with the 2309/2310. Now the issue I am having I need to know the roll off frequency of this horn. I do know when match up with the 2440 drive roll off frequency was around 12khz. I need this to know this horn can use up to 18 or 20 khz

 

[Nyjblbob]

While I know nothing about the Radian drivers you have,
I do run the short 2”horn Lense combination with my 2440’s, and 376’s.
You will still need to use Tweeters. Even me with my upper
Limit being 11K. I Can hear the lack of Air .
Both my big jbl systems Xover’s are at 7-8K
Even the 1” drivers in my 4343’s Xover at 8500
The Radian Diaframs are fantastic but they cannot go that high with the short horns.

 

[bowtie427ss]

I need this to know this horn can use up to 18 or 20 khz

Wishful thinking at best.

Above 12khz you are already in the break-up region of most large format drivers.

The FR plot for the radian tells the story, a small peak around 12k and then just takes a steady plunge above that.

On a smaller horn, one might massage a fraction of an octave of HFE out of it with a bit of EQ/compensation. But, as with nearly all large format drivers it's done somewhere in the 12k to 14k range.

The outstanding feature of this driver is it's smoothness down to 350hz.

On the right horn, it would be a superb mid driver for use with K-horn bass sections.