I agree. These guys make suggestions based on tradition guitar players not guys using a modeler who want flat response
I actually do use a mic'd cab, but still want the truest sound possible, not an idealized version.
If it sucks in my ears, it'll probably suck to the audience.
1st time IEMer if you couldn't tell. Too damn expensive to get wrong the first time.
Honestly.. I think you guys are over-thinking/over-analyzing the IEM thing... I have not found one vendor that provides FRFR IEM's.. AFAIK - they don't exist... even the JH SIren series are NOT flat - and at around $3k a pop <shrug> ??
The only vendors that publishes EQ curves are UE and 1964 (that I know of).
And "
If it sucks in my ears, it'll probably suck to the audience" isn't necessarily true.. depends on how you tap your IEM mix and whether you have someone mixing FOH/mons separately or you run your own!
Before you run out and buy customs,
try universal fit.. See if you can find some local folks that have them - so you can compare models... you CAN'T try others customs as they don't fit (duh!).. so universals are as close as you can get to a true test. SEAL (for low-end) is [generally] better on customs, and most vendors will send you a set of demo universals (for a fee). Vendors also go to the major audiophile events around the country, so that's another chance to demo various vendors and models.
I'm no expert, just a local yokel who's run the gamut of going IEM, from various clunky wired solutions thru various wireless and varying quality solutions over the last 7 yrs. Also run thru Westone, Carvin, Shure, Senn and 1964 Ears buds and Carvin, Shure and Senn wireless units during that time with varying combination/success rates.
During that time I have observed that the folks who have the most trouble moving to IEM's are guitar players - MOSTLY those who use tube amps (modelers move more easily), along with bass players. The result of that is what I've said before - get the best multi-driver custom molds you can afford. But that doesn't mean one should START OUT there... !!
My current rig is Senn G3 wireless (from an X32 feed) into 1964 A8's which I use for guitar and bass and couldn't be happier. It's not cheap, but I got here thru trial and error, and a lot of $$ in upgrades along the way. The bright side is that I sold all the old stuff (except for the 1964 Qi's) so some of the expense was recouped!