Hi All, I spend the day listening to several different horns using the TAD 4001 and JBL 2445 with the TrueXtent Beryllium diaphragms. WOW is all I can say. We got the TrueXtents from Black Swamp Audio and in every instance I thought the 2445s with the Beryllium diaphragm sounded better. Not by very much mind you: and I am JBL biased, but for the price of the diaphragms and the 2445 that is readily available, it is a no brainer which one I am buying.
Here is a shot of all the horns we brought together at Brad's (Black Swamp Audio) for critical listening. It was me, Dan (Cosmos), Rick (Tubino), and Brad. We had 2 sets of Yuichi horns, Smith horns, 2 pairs of Edgar horns, and Matinelli horns. All but the Martinellis took 2" compression drivers. We had 2 pairs of TAD 4001s and a pair of JBL 2445 with TrueXtent Beryllium diaphragms. My favorite combo was Rick's Yuichi horns with Dan's JBL 2445 drivers. There are not enough words to discribe the sound....if was wonderful.