I've been pretty busy working on some DIY speaker mods with a local JBL enthusiast named Zilch that I met through the audiokarma.org forums
First up is the Acoustic Research 4...
...modified into a Zilchlabs Research 4
That's a JBL OASR horn coupled with a BMS 4540nd compression driver and a JBL 116h woofer. OASR stands for Optimized Aperture Symmetrical Radiator which feature a dispersion of 100 x 100.
We documented the response curves which I will post later. We're still working on a passive crossover. The sound is amazing!