The first driver being characterized this month came from pro sound OEM Oberton, Ltd., which first appeared in Voice Coil’s Test Bench in January 2020 with its 1.4” ND72HB/CT compression driver.
...

The driver that Oberton supplied for this month’s Test Bench explication is the company’s new ND45 1” compression driver (see Photo 1) along with the H-960 1” throat PBT-PET 90° × 60° constant directivity horn.

The ND45 has a 44 mm (1.75”) diameter two-layer voice coil wound with aluminum wire wound onto a Kapton former driving a polyester sandwich diaphragm and vented surround (see the Photo 2), with the entire assembly being field replaceable.

Other features include a FEA-optimized neodymium ring magnet motor structure, copper shorting ring, a continuousrated power handling of 40 W with a peak power handling of 80 W, a 1.5 kHz recommended minimum crossover frequency (second-order high-pass filter), heatsink fins on the back of the assembly, 110 dB sensitivity, plus gold terminals. Cut-off frequency for the H-960 horn 850 Hz, perfect for the ND45. ... read more