Well, the Sonys are 4-ways down to 27Hz in closed box system and nominal 4 ohms. 30 kilos each, Seas drivers, built by Canton Germany, original cost 5000 Deutch Marks. The bass is earth shaking and amp protection mode entering. *biggrin*
JBLs are flat and loud, less problematic to drive but terrible to place (should be horizontal at ear height). Great drivers, horrid crossover and wiring.Also due for an expensive refoam/recone. They don't have the vintage appeal but do have a better sound. These were proper studio monitors, not just control monitors. But compared to todays actives they are not as accurate, more home hi-fi than studio by today's standards.
I'm thinking what to use as second pair of speakers sitting next to the B&W CM1s for those "I need SPL bb!" moments.