I also support the vintage JBL nod- if you want big sound on a budget. A vintage audio enthusiast friend of mine says the JBL 4698 B Cabaret is (was) the biggest secret in home audio.
The JBL 4698B Cabaret Series is a 3-Way Speaker with 18" Woofer, 10" Midrange, and 2404H Tweeter. These were made for sound reinforcement but they make a killer home speaker. These keep up all day long with JBL 4343 4345 and blow the JBL L300 out of the water. Components in each cabinet are; E155 18" Woofer with Cast Aluminum Basket and 4" Voice Coil. Midrange is E110 10" Cast Aluminum Basket. The tweeter is a 2404H and is exactly the same as 2405, 077, 076, 075 but this one has baby cheek front for wide dispersion, these tweeters have a frequency response to 21.5kc.
These speakers handle every type of music and do it well. Frequency Response is 35Hz- 21.5kHz. Power Handling 400 Watts RMS Continuous and 800 Watts Peak, Impedance 4 Ohms. Sensitivity is 103 dB/1 Watt/1 Meter. That makes these as efficient as a Klipsch Corner Horn Speaker. So these JBL’s are an excellent choice if you want to run low power tube amplifier or run high power solid state amp- these speakers do it all.
The bass will mix concrete, smooth as silk midrange, and high frequencies that will give you goosebumps. Back in 1990, these sold for $2600/pr.
I would plan on (re) building the cabs. They were designed for roadwork and they are not suitable for placement in most homes (ask my ex-wife...) I would use Russian birch plywood and a nice mahogany veneer. You will not be disappointed.