JBL 2402 Ring Radiator

Name: JBL 2402
Brand: JBL

The JBL 2402 is a high-frequency compression driver of the ring-radiator type. The diaphragm is a ring, not a dome or cone. JBL used these as super-tweeters in multi-way systems, typically crossed over above 5 kHz. It shows up in professional rigs. A Mix article from 1989 (p.175) described a live-sound setup using a super-tweeter module with three JBL 2402 ring radiators in a horizontal phased array.

The 2402 (also designated 2402H in some sources) uses a 2-inch diaphragm with a 1.75-inch voice coil and a 7 oz. magnet. It presents a nominal 8-ohm load. Sensitivity is rated at 105 dB SPL (1W/1m). Power handling is rated at 25 watts (above 5 kHz crossover) by Lansing Heritage, or 30 watts continuous program by JBL's historical site. The baffle opening needs a 3.5-inch (8.9 cm) diameter cutout, and the driver weighs 3.6 lbs (1.6 kg).

JBL also used the 2402 in its professional PA cabinets of the 1970s. A Recording Engineer ad from August 1976 (p.25) shows the Model 4682, a K-series instrument speaker cabinet with four K-110 10-inch drivers, two 2402 ring radiators and a dividing network. A Sound and Communication article from January 1988 (p.32) listed the 2402H with a sensitivity of 110 dB and a price of $165.00.

Sources disagree on the frequency range. Audio Heritage lists 2.5 kHz to 20 kHz, while Lansing Heritage gives 5 kHz to 22 kHz. The Lansing Heritage figure matches the "above 5 kHz crossover" note in its own spec sheet, so it's the more consistent of the two. Power handling splits the same way: 25 watts (above 5 kHz crossover) from Lansing Heritage, 30 watts continuous program from JBL's historical site. Both are plausible depending on how the rating was measured.

Replacement diaphragms for the 2402H are still available from aftermarket suppliers (Parts Express, US Speaker), which suggests vintage JBL fans and PA system restorers still use the driver. Little is documented about production years or which JBL home speaker systems offered the 2402.