I must of read the same post. I checked the 48 screws on my 3 year old Bryston A2's and most of them were loose. After tightening all of them up I do believe the sound was better.
Got a screw loose?
So based on a comment from another forum, I decided to ensure the screws on all my speaker and subwoofer drivers were secure. Turns out everyone of them needed some level of tightening.
Suggestion: Check your screws, definitely helped tighten up the sound as well.
Question: Is there other “maintenance” I should be doing on a regular basis?