JBL LX11

The JBL LX11 is a passive crossover network, the "brains" between an amplifier and a two-way speaker system. It is not a complete loudspeaker. Period listings call it a "typical Signature Lancer 2WAY network," which puts it in JBL's Lancer family of home audio components. The LX11 is a 24dB/octave Linkwitz-Riley design with a 3kHz crossover point and a 3-position attenuator switch for tweeter level. It's rated for 35W continuous program material and presents an 8Ω input impedance to the amplifier.

Documentation on the LX11 is thin. No production years, original pricing or detailed design write-ups have surfaced, so what's known comes largely from auction and resale listings. The crossover was paired with JBL's LE10A woofer and LE20 tweeter in a complete system rated 45Hz - 20kHz at 89dB sensitivity, with recommended amplifier power of 10-125 watts. The crossover itself weighs 0.9kg packed and needs no external power. The wiring is color-coded: red for tweeter positive, blue for woofer positive, black for negative on both.

Surviving examples are usually sold as matched pairs, often described by resellers as "fully tech tested." A Japanese auction listing noted one unit with peeling sticker decals, and it sold for ¥7,150. Korean sellers have pointed out that the LX11 is useful for DIY two-way speaker builds. A tech Q&A offers one caution: when replacing tweeters, match the crossover's impedance and power rating to avoid damage.