Look at what the cat dragged in! Released in the mid-80s, the 4698B (and 4699) were among the last of the Cabaret series released by JBL. Later stuff from JBL was more pro-oriented, that is to be stacked on stage for Atticus Fetch rock opera concerts. The 4698/99 are actually usable in home environments, although a moderate to large space is needed because the speakers are so big. They also need to be placed a few feet away from the walls per their design. The mid-80s were probably the peak of JBL (it can be argued that it was earlier). Speakers like this just aren't conceived anymore. The 4699 is supposed to be the full range playback system. The 4698, which I picked up, is intended for sound reinforcement for full range instruments (keyboards, electronic drums, etc.) The major difference is the high-frequency driver. The 4699 has a bi-radial horn crossed over at 2kHz instead of a butt-cheek horn at 3kHz as seen here. The butt-check horn has wider dispersion, especially vertically. The E110 8" 10" midrange and E155 18" (yes, that's 18, not 15) are the same on both models. Here a picture of the back of the E155 that I lifted from a sale at Reverb.com. That's a big ass magnet and an important contributor to the 103db sensitivity per JBL specs. I bet the Qts is super low (EDIT: it's 0.20, and the VAS is whopping 424.8!) Because the VAS is so high, the huge cabinet is needed to achieve proper low bass extension. I believe the speaker is rated to go down to 35Hz. Modern audiophiles, like those dinosaurs at Stereophile, insist that speakers go down to 20Hz in order to qualify for Class A. I'll tell you what, they are stupid. I'd gladly trade the last 10-15Hz of bass extension for 100+db sensitivity. It's not only because that allows me to run tube amps, but it's also because high-sensitivity drivers sound "faster". And for those who build speakers, note that the E155-4 (the 4-ohm version here) has a low inductance of 0.7mH. Xmax is just over 5mm (no long throw bullshit). This woofer has the specs that I would look for. Qms at 2.2 is a bit higher (more mechanically damped) than I would like, but it's probably needed the hold the cone in place. By the way, the resonant frequency is 30Hz. The E110 midrange is a relic of the past. I don't think JBL or most other pro-audio companies make any 8" or 10" midranges anymore. The trend now is big woofer mounted to a big horn crossover frequencies not that much lower than a large 2" dome tweeter. It's such a shame. Nothing beats a dedicated midrange driver assuming midrange duties with no crossover in the midrange area. The crossover is philosophically different from today's skinny audiophile speakers. The woofers are allowed to roll off naturally without any crossover components, much like the Seas A26 kit that @murphythecat put together. The midrange only has a low pass part on it (inductor), and the butt-cheek compression driver is 2nd order high pass (cap and coil). That's a total of four reactive passive components for three drivers. Not much to rob the speaker of life. Crossover points per JBL specs are 500Hz and 3000Hz. The driver transitions are seamless and coherent. The downside is that we do hear excess bleed from the woofers and mids. The upside is as tight, articulate, fast, and punchy - and monstrous sound when cranked up. Decay could be better, but that's paper cones - we take the good with the not-so-good. We can line the 4698B up with a 6WPC amp face-to-face against any modern audiophile speaker running 500WPC, and the 4798B will utter disintegrate the modern audiophile speaker. Unlike many super ghey modern audiophile speakers, the 4698B has two inputs for bi-amping and a level adjust for the highs. The jacks will automatically switch when it detects the mid-high socket plugged in. This is ideal for an SS amp on the lows and tube amp on the highs setup. This might be a fun project to sand down and paint white so my wife will let me bring them inside the house. Maybe replace the crossover components with better parts too. I bow down to the JBL engineer who designed this speaker. I bow down to the JBL of old that would even let an engineer design a speaker like this. I bow down to the engineers who designed the drivers. And finally, fuck you Harmon and fuck you audiophile speaker companies.