I’m wondering if others have experienced that situation in the majority of recordings of this symphony’s 2nd movement, or do I have to start getting some room treatment.
I have no problems with bass in any other recordings.
If you are going to plumb the depths of your system and room, you should definitely:
1 - Get good room treatment, talk to GIK Acoustics and look at their soffit traps.
2 - Consider an EQ for the LFE input.
The deeper you go, the bigger the dragons. Subwoofers can open up most music, so if you are only hearing it with one particular recording, I'd say it's probably not set up fully.