JBL 2426H/J 1" Titanium Horn Driver, 3-Bolt, H 8 Ohm
List of JBL horn adapters
JBL 2328 Horn Throat Adapter - Pair For Sale - US Audio Mart
Amazon.com: fosa1 2pcs Tweeter Horn Adapter ABS Long Distance Hole Treble Head Adapter Tweeter Speaker Drive Head External Thread for Connection of Treble Drive Head and Horn Above Stage Voice Box :