FR graphs for mids and treble are usually pretty similar with the different testing methods, but sometimes we don't hear it the same. I agree it can help tell us when a headphone has huge spikes and dips usually. But I will not ever trust a FR graph for bass response. That is one frequency that will always confuse me. Listening to the headphones is the best way in the end.
The FR graph on the page below is similar to Tyll's 8400 graph:
I still didn't hear that big of a hump on the KRK though.
Edited by staticfi - 7/21/12 at 12:26pm