Hey no problems. If you're going to use the Veritas system - just be aware that uncalibrated it has a tendency to understate from about 4-5 kHz up. The only way to get closer to a true reading would be to find someone with a properly calibrated system, get them to measure the ETYs, send you the actual data, and then make a calibration adjustment. Otherwise - if you are just after comparison data, the graphs will show you the relation between the target IEM and ETY uncalibrated (which is what I basically did up until about 4 months ago)
Could I not use the data from the graphs Ety always provide with their ER4s to make my calibration adjustments? Or is it more complicated than that?
as long as you don't have exaggerated expectations. to be clear, your rig will not behave totally like ety's system, or like your own ears once you have inserted the IEM the way you prefer with the tips you prefer. so you're still making your own reference that happens to look like ety's graph for that IEM.
because the er4sr has the +/-1db accuracy over a good part of the audible range, using it as your reference does add a bonus over any other random choice. other people with this IEM will be able to relate to your reference with that same accuracy in that frequency range. when using other IEMs you usually can expect bigger variations from pair to pair so if you have to pick one IEM, this is a good choice.
and if you really don't want to bother too much with compensations and calibrations, the shortest road is to simply plug your er4sr in the veritas(or whatever you'll decide to use), consider the insertion depth as well as you can(not that easy for me), and use autocalibration and use that as you calibration from now on. so when you measure the the ER4sr, you get a flat line, and anything with more bass will simply show more bass. that way the er4 is really your flat reference and you don't need to be an excel spreadsheet master. ^_^
or you can decide to imitate the curve seen on the er4 certificate, so that ety's raw is now your base for calibration. here are 3 readings of the same measurement, they all really say the same thing:
what matters is to pick one and stick to it when you later go and make all your measurements. calibration, smoothing, scales. all that needs to stay the same so that people can compare one of your measurement to the next(I still have a hard time doing it but don't tell anybody), which is the only really informative bit we provide in the end. even the super expensive dummy head manufacturers don't claim to have the neutral reference(because it does not exist for more than 1 ear), so it would be silly of us lowfi graph makers to claim that we have such a reference. repeatability is what we can do, the rest is for readability or convenience.
PS: having to boost some parts of the trebles by more than 30db to go from my raw to ety's raw, shows why the veritas doesn't cost 10k$ and why it's healthy not to take results in those areas for granted.
