JBL 4782A (c. 1992)

The JBL 4782A is a professional sub-bass cabinet from JBL's Sound Power Series. It is a dual 12-inch, triple chamber bandpass (TCB) subwoofer, aimed at large halls and outdoor stages. It was listed at ¥370,000 per unit in Japan around 1992. This is not a living-room speaker. It is a high-output, high-power touring and installation cabinet.

The enclosure uses JBL's own TCB (Triple Chamber Bandpass) design. It loads two 30 cm (12") 2206H cone woofers in a configuration JBL developed to get maximum output with controlled excursion. Rated input is 1,200W AES allowable, with a frequency characteristic of 28 Hz to 250 Hz (-10 dB) and a maximum output of 129 dB. The dual tuning frequencies of 36 Hz and 89 Hz hint at the dual-chamber tuning of the bandpass cabinet. Nominal impedance is 4 ohms, and input connections are via dual Neutrik NL4MPR speakON connectors.

The 4782A is designed to pair with the JBL 4716A, 4726AP, and 4728AP two-way systems. It is a floor-type cabinet measuring 996 x 620 x 545 mm and weighing 55 kg. The crossover region is listed as 100 Hz to 200 Hz with a 30 Hz low cut. It is the kind of cabinet you'd find stacked at a festival or flown in a club. Documentation is thin beyond the spec sheet.

Type: 1-way, 2-speaker, TCB (Triple Chamber Bandpass), floor type
Drivers: 30 cm cone (2206H) x2
Frequency characteristic: 28 Hz – 250 Hz (-10 dB)
Output: 101 dB / 2.83V/m; 129 dB max
Allowable input (AES): 1,200W (60 Hz – 600 Hz)
Tuning frequencies: 36 Hz, 89 Hz
Impedance: 4 Ω
Connectors: Neutrik NL4MPR x2
Dimensions: 996 x 620 x 545 mm; 55 kg

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JBL 4782A (c. 1992)

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