I'm not an audiophile, so... If I do an A vs B comparison using the same input source and music I find a pretty clear difference. The Max has better separation, what I'd call richer lows (not boomy base but a more substantial floor), more neutral mids, better isolation and ANC. I would say that I think isolation and ANC are somewhat based on how well any headset fits one's head and seals and I don't rely on ANC much. The excellent transparency mode on both is more important for my usual uses. I do think they have an overall similar sound profile and I think the AP2 sound very good and in general use I don't find myself saying I wish they sounded like the Max. If I chose 1 it would be the AP2; size, weight, convenience, price etc. carry the day and I find I use them more than the Max.