@richardt9000 hi!
on the component side of things (not your hearing) clean the pots, look at the crossovers to make sure everything looks OK.
Speaking from experience with my betas. I could trace a situation with mine and I thought it was my ears (I lost some frequencies on my left ear/medical situation). I thought it must be my hearing loss.
I decided to open the crossover box and found that a cap was not soldered. On the Betas the crossover components hang down and are held in place with what looks to be hot glue. I soldered back, affixed other components that looked weak.
MAGIC was back!
inwish there was a way to test the crossover components and drivers without disconnecting them (everything is “hardwired” on the Betas).
forget about all the hoopla about amp killer, etc. if you enjoy the way the reproduce music… enjoy them.
BTW you should contact Bob Douglas and ask him your concern with the driver.
I started a thread about IRS Beta, there might be other Kappa owners there