Spike is at 6k but doesn't drop off till after 7k. Yet another example of inevitable resonance occurring from the design.
7550s don't get away with not having the spike. But It has more damping than the EX600 and EX1000, which makes regions past 4k less emphasized overall. The EX1000s and even EX600s are actually more flat than the EX800ST, I think the 800ST were made with ear fatigue in mind for long studio and stage use, ala Westone and Shure.
Edited by Inks - 8/2/12 at 4:41pm