yeah pretty much :-(
Hey Marv, how long usually is the duration for a measurement of a channel? I'm wondering if you could do a measurement on yours or TMR's HE560, but with pressure on the cup so that the earpads are significantly depressed, and the drivers are closer to the measurement aperture. Would that be possible?
I just feel as though the 4k hump might be due to something very simple.
The thing is there are only two real differences between Focus and Focus-A pads: your ears are closer to the drivers with Focus-A pads, and the shape/covering of the undersides are different (angular pleather, vs sloped mesh). The internal foam is the same, the outer shell as well. One of those two aforementioned factors has to be the determinant for the 4k hump.