[DanT]

Nice. It seem that they have a very different sound sig than the etys.

If you like to tweak, have time to spare you might want to try an DIY pseudo ety P-S adapters to see if what it does to the sound. The P-S adapter is only 75 ohm resistors in series with the signal to bring ER4P from 27 ohm to ~ 100 ohm ER4S. Maybe 50ohm or ~ 30 ohm adapter.

The adapters usually clear up the highs a bit.
Not saying it will do klipsch any good since different headphones react differently.

Enjoy your new headphones and Happy New Year,

Cheers,

Dan.