JBL N2400 (early 1970s)
The JBL N2400 is a passive crossover network, best known as the frequency-dividing network in the JBL L100 Century speaker system of the early 1970s. Its crossover point is 2500 Hz, a figure confirmed across multiple independent sources, including the Lansing Heritage catalog listing. The network was designed to work with the L100's LE25 tweeter and LE5-2 midrange drivers. A 1961 HiFI-Stereo listing documents the JBL N-7000 dividing network with a 1200 cps crossover (HiFI-Stereo, 1961, p.152). That same listing shows the broader family of JBL networks the N2400 belongs to (HiFI-Stereo, 1961, p.152).
The N2400 has a modest but genuine following among DIY and restoration people. Owners commonly report that the original electrolytic capacitors dry out with age and benefit from replacement - a practice known as "re-capping" - and several forum users describe improved performance afterward. The network is generally regarded as a quality vintage crossover, and one owner notes it "sounds good" in their L100 restoration. Original units typically ask roughly $50 to $150 on the resale market in 2023-2024, and aftermarket "clones" are widely available for L100 restorations.
Documentation on the N2400 as a standalone component is thin. No original retail price, production years, dimensions, or detailed schematic have surfaced in the research. The 1976 JBL catalog lists the network as the crossover for the L100 system, and it belongs to JBL's "N" series of networks, a family that also included the N7000.
Known specs:
- Crossover frequency: 2500 Hz
- Type: Passive LC crossover network
- Application: JBL L100 Century speaker system (with LE25 tweeter and LE5-2 midrange)
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