JBL 4330/4331
Released in 1974
4330 : ¥ 420,000 (1 unit, around 1975)
4330 wx : ¥ 443,000 (1 unit, around 1975)
4331 : ¥ 488,000 (1 unit, around 1975)
4331 wx : ¥ 511,000 (1 unit, around 1975)
Commentary
A 2-way speaker system developed for playback monitors and mixdowns in recording studios, broadcasting stations, halls, etc.
The 4330 uses a multi-amplifier system and the 4331 uses a network system.
A 38 cm cone type woofer 2231A with improved density and mass of cone paper is and mass of cone paper.
A horn-type unit that combines a driver 2420, an exponential horn 2312, and an acoustic lens 2308 is mounted in the high range.
The center pole piece of Driver 2420 is coated with pure silver and operates as an impedance control ring to maintain smooth high-frequency characteristics.
In addition, the long shape of the horn reduces exposure at low frequencies, making the connection with the woofer natural. The directional characteristics are 60 ° horizontal and 30 ° vertical at 12 kHz by combining an acoustic lens.
The 4330 used in the multi-amplifier system requires a power amplifier, a divider 5231 or 5232 and a filter board 52 to 5123.
There were 2 kinds of variations, gray finish and walnut finish for each.
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Model Rating
| Method | 2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type | ||
| Units Used | For low band : 38 cm cone type (2231A) For High Frequency : Horn Type (2420 + 2312 + 2308) |
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| Frequency characteristic | 35 Hz to 15 kHz ± 3 dB | ||
| Allowable input (Continuous Program) |
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| Impedance | 8 Ω | ||
| Sound pressure level (new JIS) | 93dB | ||
| Crossover frequency | 800 Hz, 6 kHz | ||
| Enclosure internal volume | 127liters | ||
| External dimensions | Width 600x Height 780x Depth 510 mm | ||
| Weight | 4330:43kg 4331:44kg |