Originally Posted by AustinJerry
Well, the "All SPL" is a display window that shows existing measurements. When the measurements were originally taken, they were taken with the mic cal file in effect. Simply displaying a pre-existing measurement in the All SPL window doesn't remove the cal file adjustments. That would be weird, wouldn't it?
Using the UMIK-1 and REW to measure headphone output is somewhat unusual, and I don't claim to have ever tried it, or understand how it could be done.. Not sure whether the measurements you are getting are accurately capturing the frequency response of your headphones, which are very nice indeed.
Yeah, I definitely loaded the calibration file in beforehand. I was just misinterpreting the postive/negative values of the .cal file and operating on some questionable advice.
Here is the measurement rig. The coupling surface is creatology foam with graduation marks for placement repeatability, foam blocks for structure, and some polyfill on the surface immediately around the mic. A lot of people on superbestaudiofriends.org do this kind of thing and a few on head-fi.
It's not as far off from some pro measurements as I though it'd be. It seems pretty accurate until about 7 khz or so, compared to this pro measurement from Innerfidelity:
On my rig:
Same Headphone make/model pro measurement: