Ok here is the graph.
Usual disclaimers:
The graph below is generated using the Vibro Veritas coupler and ARTA software. Ken Ball (ALO/Campfire) graciously provided me with measurement data which I have used to recalibrate my Veritas so that it mimics an IEC 711 measurement standard (Ken uses two separate BK ear simulators, we measured the same set of IEMs, and I built my calibration curve from shared data). I do not claim that this data is 100% accurate, but it is very consistent, and is as close as I can get to the IEC 711 standard on my budget.
I do not claim that the measurements are in any way more accurate than anyone else's, but they have been proven to be consistent and I think they should be enough to give a reasonable idea of response - especially if you've followed any of my other reviews. When measuring I used the included foam tips (so medium bore) - and the reason I use foam instead of silicone is for the very consistent seal and placement depth in the coupler. I use the same amp (E11K) for all my measurements - and output is under 1 ohm.
Things to note
- Incredibly good channel matching - this is about as good as it gets folks. I had to check a few times to see if I'd measured the same earpiece by mistake!
- Nice mid-bass hump and good sub bass extension (they have a decent amount of thump)
- Bass matches natural peak in the upper-mids
- Really good treble extension