Instead of spending thousands for an speaker change, I suggest you consider a $150-$200 cap upgrade for the tweeters.
The stock Solen PPA found inside the Micro Be is a $1.5 cap that's nothing compared to the better ones out there like Jensen, Mundorf, or V-Cap. That cap is in the signal path of everything above 2.5kHz.
Swapping the caps is not invasive. Any solder-competent tech with a torx screw can do it in 10 minutes or less.
The stock Solen PPA found inside the Micro Be is a $1.5 cap that's nothing compared to the better ones out there like Jensen, Mundorf, or V-Cap. That cap is in the signal path of everything above 2.5kHz.
Swapping the caps is not invasive. Any solder-competent tech with a torx screw can do it in 10 minutes or less.