Harbeth 40.2

I own the 40.2’s, the only flaw I can touch on is their cabinet.  I am not a fan of the big box design, but man, they sound VERY good.  I do not agree with the statement about loss of any detail in the midrange.  They will respond and change depending on what you feed them with.

I’ve got a pair of the 30.1’s and completely agree with dznutz - the Harbeth’s are as close to completely transparent as I’ve heard.  
I’d also say that we oldsters have a more refined perspective on fine sound than a 21 year old.  Music is not binary.  
I’m not sure Harbeth speakers would be the best reproduction devices for dubstep.  

There is the classic BBC dip which literally means it will be quieter in the midrange.

A dip in the 1KHz - 3KHz range does not necessarily mean "loss of details".  It just means that the upper mid (such as female voice) will be less forward.  "Details" is more intrinsic to the resolution of the equipment and not really related to the frequency response of the speakers.  A "BBC dip" only modifies the characteristic of the sound reproduction and not the details.

There are speakers that intentionally emphasize the "BBC region" and high frequencies and sometimes that may be mis-interpreted as "details".