I heard both at canjams, twice, and at length.how much more detail does the MM500 have versus the lcd x 21?
I take the X every time.
LCD-5 is a little better!
Frankly, I told the Audeze reps, as a joke, to pull the X off the market! it is hard to justify the price of the LCD-5 against the X!
I personally wanted a closed back, so I got myself the XC 21.