Improve B&O Beolab 9 (STK403-139)

Hello,

I have a pair of Beolab 9 active speakers wich are playing fine but in the high frequency range they lack some detail in my opinion.
Looking at the service manual I can see that an ICEpower module is used for the bass driver and an Sanyo STK403-130 chip amp is used for the Mid and Tweeter.

https://datasheetspdf.com/datasheet/STK403-130.html
https://www.manualslib.com/manual/1494486/Bang-And-Olufsen-Beolab-9-6217.html

Both amps use a common switching power supply. I was wondering: would it make sense to add some high quality bypass caps to the power rail of the Sanyo chip amp or is that a total bs idea?


regards,

Eric