Originally Posted by
Rudy Kleimann
So, Toddalin (and others in the know), how does the 2405 dia measure/sound in an 075/2402 driver?
Has anybody measured the frequency response of an 075/2402 driver with a 2405 diaphragm in it?
Would you dare say that this hybrid results in more extended UHF response than an 075 diaphragm in the 075/2402 driver?
I have pondered and researched this very question numerous times over the years, scouring JBL documents and everything I could find on the ring radiators on this website. I have learned a lot about these drivers and diaphragms, but never could get to the answer of this question. I always "knew" that the differences between the two diaphragms would end up being simple and straghtforward, but never had one of each to measure myself. Lacking sufficient test equipment and the funds to bankroll such an experiment, I have been hoping for all this to come out from the efforts of others more fortunate than myself...
I own an old pair of "bullets" that I'd like to use for UHF on a pair of long-throw 55* PA cabinets (horn-loaded 2012 from 300Hz and 2447/2383 crossed at 1250Hz). The coverage pattern of the bullets seem acceptable for this application, but I wasn't gonna go to all the effort of re-engineering the crossover and making cabinet mods unless I would get better response than the stock 075 would do, hoping to get all the way out to 20K.