I'm just packing up my tMBP and have replaced it with a ntMBP (due to battery life). Side by side they sound very similar. The tMBP has the bass coming out of the bottom/sides with the highs coming from the "speaker grills". This makes the highs and lows sound like they are separated from different sources. It's not a bad thing, still sounds great. The ntMBP sounds like it has a little less bass to me, highs are more distinct. I will say in person, the definitely sound different, but both excellent laptop speakers. The ntMBP seems to get a little louder.