JBL 3110A Professional Crossover Network
The JBL 3110A is a two-way stereo crossover network. JBL built these by the thousands, and almost nobody documented them properly. No source we've found records the production years or the original price. The record picks up mid-life, when the unit was already established as a workhorse.
What's known is concrete. The 3110A splits the signal at 800 Hz with a 12 dB-per-octave slope, handles up to 50 watts of amplifier power, and presents an 8-ohm load, matching the 8-ohm systems it was intended to drive. It's a floor-standing external unit with L-pad attenuators for high- and low-frequency output levels, and it terminates in 5-way binding posts. The front panel makes its own claim - part marketing, part simple truth - that "the 3110A has been the standard crossover for 2-way systems." It was the crossover used with JBL's Control 5 monitor system.
Mix magazine (February 1984, p.132) reported the introduction of the 3110A alongside the 3115A and 3120A as new Professional Series frequency dividing networks, each with a three-position high-frequency equalization boost. Sound and Communication (May 1985, p.37) likewise listed the 3110A as the frequency dividing network in a JBL professional system lineup. Beyond that, documentation is thin. There are no dimensions, no weight, no frequency response figures and no owner reviews.
- Type: 2-way stereo crossover network
- Crossover frequency: 800 Hz
- Slope: 12 dB per octave
- Maximum amplifier power: 50 watts
- Impedance: 8 ohms
- Controls: L-pad attenuators (HF and LF output levels)
- Connectors: 5-way binding posts
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