hmm i like the extra bass in bypass L/R, sounds good.
does bypass roll off the treble though?
flat doesnt and thats why i like it
Bypass L/R retains the Audyssey EQ for the sub only.
The benefit of roomEQ for bass are indisputable (though most would prefer the option of also EQ'ing the mains up to the Schrodinger frequency for their room).
Thus, it makes total sense that the bass would sound better.
Whether it is perceived as an increase or decrease of bass depends on the room and how Audyssey reacts to it.
Also our perceptions are not always what we might measure with instruments.
For example, it could be that w/o EQ you have a strong peak in your room at 80Hz. Eliminating that peak can reveal a lot of other bass content that was previously obscured such that your main perception after EQ is more bass, even though those other frequencies were there (albeit masked by the 80Hz peak) all along. I'm NOT saying that is the case here. I have no idea. I only want to make the point that our perceptions don't always reflect total reality. It is a safe bet that if it sounds better there was an improvement, but we can sometimes infer the wrong cause for that improvement.
Bypass would only roll off the treble by undoing Audyssey. So if Audyssey increased the treble, then Bypass would undo that increase.