JBL 4313WX (1976–1978)
The JBL 4313WX is a three-way bookshelf studio monitor from JBL's professional 43xx series, produced from 1976 to 1978. It was priced at $298 each at launch — roughly $1,500 in today's money — placing it as a serious tool for near-field monitoring rather than a casual home speaker.
What makes the 4313WX distinctive is its driver complement. It pairs an LE111A 12-inch woofer with a 12-inch passive radiator in a bass-reflex cabinet, rather than a conventional port. The midrange is handled by an LE5-12 driver, and the LE20-1 tweeter uses an encapsulated design. Crossover points sit at 800 Hz and 4500 Hz. The result was a monitor that could reach down to 45 Hz from a bookshelf-sized enclosure, rated for 75 watts continuous and 150 watts maximum, at 8 ohms nominal impedance. Each speaker weighs 32.6 lbs.
The 4313WX was designed with studio use in mind, and that shows in the controls. Two adjustments on the front and two knobs on the rear allowed engineers to tailor the high-frequency response to their room and taste. The cabinet itself was meant to be run in a vertical orientation — a point emphasized in an era when many monitors were laid horizontally on meter bridges.
Surviving documentation on this model is thin. What's known about its performance comes from the spec sheet and from the general reputation of the 43xx series, which JBL designed for professional studio environments with some models intended specifically as bookshelf monitors for near-field listening.
- Type: 3-way bookshelf/studio monitor, bass-reflex with passive radiator
- Drivers: LE111A 12" woofer, 12" passive radiator, LE5-12 midrange, LE20-1 encapsulated tweeter
- Frequency response: 45–20 kHz
- Crossover points: 800 Hz, 4500 Hz
- Impedance: 8 ohms
- Power handling: 75 W continuous / 150 W max
- Weight: 14.8 kg (32.6 lbs)
- Original price: $298 each (1976)
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