Original JBL / Selenium - D305 Phenolic Compression 2" Bolt-On Driver 8-ohm Driver X Horn Connection 2" (50 mm) exit compression driver for high sensitivity, low distortion and smooth medium frequency response applications.That leads the D305 driver to deliver high performance, high quality and high value for the pinnacle in sound reinforcement applications. Its construction features include: ferrofluid (Ferrosound ) loaded gap reducing heat build-up and offering consistent results over long-term demanding concert usage; voice coil is made of high temperature wire wound on Kapton former to withstand high operating temperatures; injected plastic housing; precisely engineered diaphragm structure and alignment mechanism allows for easy, reliable and cost effective repair in case of diaphragm failure. General Specifications: Nominal impedance - 8 ohm Minimum impedance @ 3,870 Hz - 6.4 Power handling Musical Program(w/ xover 500 Hz 12 dB / oct) . . . . 100 W Musical Program(w/ xover 1,000 Hz 12 dB / oct) . . . 150 W Frequency Response at 10 dB - 400 to 9,000 Hz Throat diameter - 50 (2) mm (in) Diaphragm material - Phenolic. Voice coil diameter - 75 (3) mm (in) Minimum recommended crossover (12 dB / oct) - 500 Hz Sensitivity On horn,2.83V at 1m, on axis - 110 dB SPL On plane-wave tube,0.0894V - 115 dB SPL Re - . 6.0 ohm Flux density - 1.60 T Musical Program= 2 x W RMS. Measured with HL4750-SLF horn, 800 - 3,500 Hz average. The sensitivity represents the SPL in a 25 mm terminated tube, 800 - 3,500 Hz average. Additional Information Magnet material - Barium ferrite Magnet weight - 1,600 (57) g (oz) Magnet diameter x depth - 169 x 19 (6.65 x 0.75) mm (in) Magnetic assembly weight - 4,360 (9.61) g (lb) Housing material - Plastic Housing finish. - Black Magnetic assembly steel finish - Zinc-plated Voice coil material - Copper (® Voice coil former material - Polyimide (Kapton ) Voice coil winding length - 5.3 (17.4) m (ft) Voice coil winding depth - 3.5 (0.14) mm (in) Wire temperature coefficient of resistance (a25) - 0.00337 1/°C 3 Volume displaced by driver - 1.4 (0.049) l (ft ) Net weight - 5,000 (11.02) g (lb) Gross weight - 5,100 (11.24) g (lb) Carton dimensions (W x D x H) -19 x 18.5 x 8.5 (7.5 x 7.3 x 3.4) cm (in) Mounting Information : Horn connection - Bolt on Number of holes - 4 (M6) equally spaced threaded holes Threaded holes diameter - 102 (4) mm (in) Connectors - Push terminals Polarity - Positive voltage applied to the positive terminal (red) gives diaphragm motion toward the throat .
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