Keith (bluemonkeyflyer at Head-Fi) sent me one of his measurement kits to play around with. It's a Panasonic WM61A mic hot glued in a tri-flange tip. A phantom PSU was provided. Basically, you insert the mic into your ear, the mic faces outwards, and you put headphones on like normal (other ear has plug in it).

This has some obvious upsides and downsides, and it's not likely to be as consistent or accurate as measurements from a dedicated rig with good compensations. One obvious downside is that you'd need to switch the mic to your other ear to measure the other channel, thus hindering measurement repeatability and consistency, among other issues.

For now, I've just been experimenting with trying to get results that make sense, are somewhat repeatable/consistent, and not too far off what you might see elsewhere. I have a very basic FR compensation ready, which corrects for the bass-roll off from either my line-out or mic-in (not sure which) and corrects for the slight treble increase most WM61As exhibit. I tweaked this a bit, as 20Hz was listed as -15dB down when calibrating through software, but I set my compensation instead to -10dB. Subjectively, this gives what looks to be more accurate results, but it may actually be more correct if I left the bass compensation as it was (stronger).

Lately, I've been testing as follows: Creative SB1240 line-out -> Leckerton UHA-6S MkII line-in -> Leck. HPO to headphone -> mic in ear -> phantom psu -> SB1240 mic-in

What I need to do is get something setup so I can accurately measure the SPL of a headphone, thus making it possible for me to more accurately calibrate all of my software and volume settings for my mic-in. Currently, I just have my mic-in set to a static volume setting (80/100) and adjust the HP volume accordingly on the amp so that it gives around -10dB at 1KHz during ARTA tests. I set the mic volume setting simply by trial and error based on how "off" the THD measurements looked, and 80 seemed to not be wildly off, maybe. FR didn't change much regardless. Basically, I used trial-and-error to produce results that very loosely matched Marv's measurements, not to say my methods are at all similar to what he does.

I think the only headphone I have on hand that isn't modified in some way is the UE6000. I'll measure that next. For now, I measured my Mad Dog 3.2, which I applied several front-damping tweaks to a few weeks back (damping dot in middle, single ply tissue and foam disks around that, mostly). The idea was to smooth out the treble and make them a bit less U-shaped sounding. Though not comparable on many levels, Marv has the two different MD3.0 measurements on this site, Dan/MrSpeakers has posted measurements from time to time that are scattered around at various sites, and Tyll has measurements of a supposedly faulty MD3.0, I believe, listed at some URL that doesn't appear to be posted publicly on his site (hint: open MadDog measurement listed on his site, which is old, and replace the "A" at the end of the URL with "2013").

L/R FR, HD, and CSD are attached for my personally tweaked MD3.2. Any advice on HP measurements is appreciated! I can post further details on my setup and settings as well.

One thing I've noticed in my early measurement experiments is that it seems they all show the same dip around 8KHz, but I'll have to keep testing and investigating. Often this gets at least partially filled out in CSDs. Channel matching is not too bad, given the method, and might even be within spec or what other MD measurements have shown in the past. Let's not also forget my tweaks were handmade, and not precisely at that!

Edit: Updated R CSD, did not have data open to adjust L