The classic. The JBL 4311B is one of the most sought-after models from JBL, and this pair has been recapped, reclothed, and reimagined.
Condition
9/10
Serial No.
46015A
Restoration
- Driver impedance and performance tests
- Repainted faces
- Installed new binding posts
- Recapped crossovers
- Critical listening tests
- Exterior detailed
Factory Specs
Type 3-Way, 3-Speaker, Bass reflex standmount loudspeaker
Sensitivity 91dB
Frequency Response 45 Hz to 15 kHz ±3 dB
Impedance 8Ω
Dispersion 90°
Output sound pressure level 91dB/W/m
Power Handling 40W(RMS) / 75W(Peak)
Enclosure volume 40L
Woofer 300mm long throw cone (2213H )
Midrange 130mm cone (LE5-10)
Tweeter 36mm direct radiator (LE25-2)
Crossover frequency 1.5 kHz, 6 kHz
Dimensions 14.25"W x 23.5"H x 11.75"D
Weight 44 lbs.
Documentation
JBL 4311b Owner's Manual
JBL 4311b Schematic
JBL 4311b Brochure
The History of JBL
JBL was founded by James Bullough Lansing (1902–1949) who was an American audio engineer and loudspeaker designer most notable for establishing two audio companies that bear his name, Altec Lansing and JBL, the latter taken from his initials.Lansing and his business partner Ken Decker started a company in 1927, in Los...
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Liner Notes
The history of some of the world's most famous and valued JBL loudspeakers traces back to the 1960s, commencing with the 4320 model. This model was a staple in many sound studios, laying the foundation for JBL's legacy. Nevertheless, professionals in the industry were seeking a monitor that was both professional-grade and compact enough to be mobile. As a response to this demand, the 4310 model was born, a product of collaboration with renowned recording studios, and it quickly gained widespread popularity.
However, just as the 4310 was gaining momentum, JBL underwent a change in ownership when the Jervis Corporation, under the control of Sidney Harman, took over. Among the initial personnel changes was the appointment of Irving Stern as the head of marketing. Recognizing the success of the 4310 monitors, Stern saw an excellent opportunity to tap into the consumer market. He understood that adapting these monitors for home use would necessitate enclosure modifications.
Despite some opposition within JBL, with concerns that making the 4310 available to consumers might reduce its appeal to professionals, a decision was reached after extensive deliberation. The configuration of the 4310 was altered while preserving the core design principles, resulting in the creation of the JBL L100 speakers designed for home use. This decision proved to be a resounding success, as the model went on to become the best-selling speaker in the company's history.
Meanwhile, ongoing testing of the 4310 model revealed that the uninterrupted treatment of flat deflectors did not provide the anticipated acoustic advantages. Consequently, this feature was removed from the design. To enhance the dispersion of high frequencies, a smaller-diameter tweeter replaced the original one. Additionally, adjustments were made to the crossover frequencies to achieve a smoother response. This updated version was designated as the 4311 and featured a conventional recessed baffle, along with an H.F. radiator raised to the acoustic plane of the woofer and the front edge of the enclosure. JBL recommended it as "a compact package delivering smooth, powerful, and broadband response."
Stock No.
8201826402525
