JBL 2447H/2447J (1993)
The JBL 2447H/2447J is a professional 38mm (1.5-inch) exit compression driver introduced in 1993. It belongs to JBL's long-running family of professional-quality compression drivers. The suffix tells you the voice coil impedance: the 2447H is the 8-ohm version, and the 2447J is the 16-ohm version. JBL designed it as a medium-format, high-output driver for fixed installations and touring. Rated sensitivity is 112 dB SPL (1W/1m, measured with a 2352 horn), and the frequency range is 500 Hz to 20 kHz at -10 dB.
JBL built the 2447 around a 100mm pure titanium diaphragm with a diamond-surround suspension. The company said this reduced metal fatigue and improved durability. The phase plug uses JBL's "Coherent Wave" design, engineered so it could be connected directly to the horn throat. A ferrite magnet structure gives a magnetic flux density of 1.85T. The driver handles 100 watts continuous above 500 Hz and 150 watts continuous above 1 kHz. The recommended minimum crossover frequency is 500 Hz.
Each driver measures 235mm in diameter and 92mm deep, and weighs 10.7 kg (about 26 lbs). The 2447H was listed at ¥115,500 (tax included, one unit) in Japan around 2007. Past that listing, the record is thin - no original U.S. street price, end-of-production date, or formal period reviews have surfaced. What survives is mostly enthusiast testimony. Sellers note the drivers were often pulled from cinema installations, and buyers describe them as crisp and defined, with a lot of headroom for a compression driver.
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