@LeeRankin
I've had Etymotic ER-4PT's & S's for years & there are two brand new XR & SR versions that have been recently released on the Etymotic website for $350.
You can probably get them for a little less if you shop around....

They're (allegedly) the absolute reference in terms of accuracy & I use them with Explorer2 / iPod+Oppo HA-2 all the time, as well as for flights, due to their exceptional isolation.

Last edited by Rolski; 2017-03-28 09:09. Reason: More detail.
Trinnov Altitude CI-12; Meridian 861v8 + ID41 + UHD722v2 + 271, 2*SE-update DSP8.2Ks, SE-update DSP7200HC, 4*DSP3200, 4*DSP33, 218, 251
JVC DLA-NZ8; Panasonic TX-P60ZT60E; Lumagen Radiance Pro 5348
Roon [13i7 Win.11 NUC]; SKY Q; Oppo UDP-203EU; AppleTV / Fire Cube / Roku / NVidia