^ Supposedly these are Etymotic OEMs, you can see them being sold for $25-$29 by another USA seller on Ebay. I've got one coming in tomorrow.
^ I purchased one of these and they came very quickly from China (via HK EMS).
Both add 75ohm load on top of your headphones. There's another seller that sells multiple loads, from 50 to 300ohms. I believe if I go the EMOTIVA A-100 route, that's what's in line between the phones and amp. Or build a ladder-style attenuator box.
Sescom iPhone / iPod / iPad TRRS to 25dB 3.5mm Line Level and 3.5mm Monitor Jack-by-Sescom - These types of cables to attenuate from line level to mic level are all -25dB which is probably way too much attenuation though.
Based on my unscientific test with my Nano Patch, I am guessing -5dB to -10dB attenuation is about right for 30 ohm IEM's.
Me Gusta Guys! I might try the Vali and one of those Attenuators before I balance my W1000x. Sadly the NFb10es2 is sounding to cold for the W1000x again. She sounds a touch sterile again... nice intimate upper mids, good bass but those low mids seems to suffer... once again I feel I need a nice tube for them :3
That said, the Vali is at a great price!