JBL 4365-owners, please try this quick-fix, and see what you like it.

1. Disconnect UHF-drivers, or duct-tape over the UHF-horns.

2. Add +6dB PEQ at 32Hz. Q=2.

My theory is that you now have a speaker sounding close to JBL K2 S9900 in sound quality, maybe even better

(4365 UHF-driver causes comb-filtering, and the bass is voiced for Japan)

Already one 4365 user in Norway is stunned by step 1. in this hack.