How much better is a high-end planar like the LCD-X, than the 400i? Is it in a higher league of performance, or just marginally better and a case of sounding different ?
Just going by price its not leagues higher performance than HE-400i, this will also depend on the rest of your chain and your taste. For me when I tried the LCD-X it was just a little better than my LCD-2 and at more than double the price really not worth it. Another thing is that I feel that the LCD line is just a little too heavy for listening for more than an hour.