Peter (I presume):
A speaker that really is 3-5 dB down at 40 Hz is going to give you very good bass performance. That's not the point. Speaker measurements depend very much on who's doing the measuring and how they're doing it. Manufacturers will always try to put their products in the best light. John Atkinson's measurements tend to be pretty generous, as well. If you look at the NRC measurements at http://www.soundstage.com, you'll see they're a bit more conservative. Tom Nousaine's measurements in Sound & Vision are even more conservative. None of them are wrong. But none of them really tell you what you will hear in your room. (And, obviously, they aren't comparable.)
I'm not anti-measurement, far from it. I'm just saying that what you want to know can't be known based on the information you have. What you want to know is, will I miss the bass with these monitors? And the only way to know that is to try one or two out.
A speaker that really is 3-5 dB down at 40 Hz is going to give you very good bass performance. That's not the point. Speaker measurements depend very much on who's doing the measuring and how they're doing it. Manufacturers will always try to put their products in the best light. John Atkinson's measurements tend to be pretty generous, as well. If you look at the NRC measurements at http://www.soundstage.com, you'll see they're a bit more conservative. Tom Nousaine's measurements in Sound & Vision are even more conservative. None of them are wrong. But none of them really tell you what you will hear in your room. (And, obviously, they aren't comparable.)
I'm not anti-measurement, far from it. I'm just saying that what you want to know can't be known based on the information you have. What you want to know is, will I miss the bass with these monitors? And the only way to know that is to try one or two out.