Yes. But on the other hand not much can be gleaned from specs. While the specs say what frequencies the tweeter handles (3500-22000Hz), and the mid/low drivers - 30-3500Hz, little else can be taken from these specs. A fequency response curve shows how evenly a speaker plays all frequencies and is more of a testament to how well the speaker will perform. To make things more complicated some listeners prefer a speaker to be more "heavy" across the low/mid or highs.
In my approach I use specs to see if a speaker meets a minimum standard of frequency response both in scope and an even response, but from there you really must hear for yourself. Problem is with first time buyers, they really don't know what they should be listening for.
Yeah, I'm withthe peanut gallery. Assuming the specs aren't fudged, you should look for the -3 db cutoff. This will give you a rough idea how low the speaker will go, but it won't tell you how it sunds over that range. A speaker that goes 30 - 22,000 hz may sound terrible at the low end, where one that goes 45 - 20,000 may sound bell clear.
I'm not saying not to check ut the speakers you mentioned, just keep in mind that it is all about how they sound to YOU.