Tubelion,
Why 300hz? What that means is that the horn lens will provide "horn loading" for the driver down to 300hz. The driver will have it's own frequency ratings, as well. I'm interested in a JBL 2482 compression driver that will also go down to 300hz and will mate to this new horn. The Klipsch driver is rated down to 400hz and would need adaptors to fit the new horn. (I'm also betting the overall size of the new horn is different, too) So some modifications would be necessary. If a new driver is used, crossover work is something to look into.
I'd like to get as much midrange as possible through the compression driver because I like the way compression drivers sound. I'd also like to get more high frequencies (300 - 400hz) off of the 15inch woofer that is inside the Klipsch bass horn. I think the compression driver will do a better job with these frequencies than the 15inch woofer. I also feel that the Klipsch mid driver is excellent until about 95db, then I want more. I always want more.
These are just my opinions and my goals for my version of this wonderful hobby. There are as many opinions and goals as there are audiophiles on this forum. That's what makes it fun.
Happy listneing, BillyRyan