Maybe the person got a new keyboard? Maybe you just didn't notice it before but now that you've started thinking about it it's impossible not to notice?
There can be a thousand factors, and these 20 objective tests are easier to trust than subjective listeners.
Very true, which is why I chose to respond to this thread in particular as the OP was highlighting the difficulty in testing acoustic performance and praising the expertise of the engineers and I really do appreciate the task at hand.
If I was reading this thread without experiencing it for myself I would be saying the exact same thing. Unfortunately for me (and lots of others according to the Bose forums) my subjective experience is the complete opposite of the outcome of these tests.
Luckily it is looking like they tested the wrong upgrade path which is reassuring as I have no idea how I could refute the tests otherwise.
There can be a thousand factors, and these 20 objective tests are easier to trust than subjective listeners.