When it comes to speakers, you can read all the reviews and study all the
 performance metrics you want.  But, at the end of the day, what matters
 is whether the speakers are pleasing to your ears when playing the 
kinds of music you like to hear. 
The science of human biology 
and speaker specifications don't always mesh.According to wikipedia, the
 average human range of hearing begins as low as 12 hz and goes to 
20khz.  Dogs can hear from around 40 hz to 60 khz.  Cats can hear from 
55hz to 79khz.  Now, I don't know if Best Buy will allow dogs and cats 
into their listening room. It's too bad because I'm pretty sure that our
 dog wants me to buy better speakers.  He'd probably like me to buy JBL ES20 bookshelf speakers since they have a dynamic range of 60 hz to 40 khz.
There is no real evidence 
that audiophile ears are any better than the ears of the general 
public.  Claims to special hearing by audiophiles are likely to be due 
to what researchers call "The Hawthorne Effect."  Some writers claim 
that sounds we can not hear may still play a role in your brains 
processing of sounds from a stereo.  Words like presence, soundstage, 
and "boominess" all play a role in speaker selection.  Unfortunately, all of 
these speaker describing words are subjective.  I know I've missed 
having deep bass with my bookshelf speakers.  If you are looking for bass in a bookshelf speaker, these Polk Audio TSi100 go down to 53 hz which is pretty deep for bookshelf speakers. 
I won't dispute 
anyone's anecdotal evidence that premium speakers are worth the extra 
money.  It isn't my role to diminish anyone's enjoyment of this hobby.  
However, the science is compelling enough to help us protect our 
wallets.  Don't let anyone compel you to buy any stereo equipment on the
 basis of any claim that you cannot directly and distinctly hear and 
experience for yourself without prompting.  In the world of speakers, 
science can defend our wallets from preposterous claims, but our 
speakers still have to be bought from the heart.
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