Of course it does luisdent, if not I wouldn't have even mention it. My ER4PT comes with the resistor adapter.
"What's in the Box
ER-4PT earphones, 1/4" stereo adapter, airline adapter, 6 pairs of ACCU-Fit eartips, shirt clip, replaceable wax filters, filter removal tool, channel-matching compliance graph, travel pouch, storage case and the 75ohm resistor adapter". Yes, the 750hm resistor came packaged in the ER4PT box. I didn't purchase it separately. In fact that's the reason why I bought ER4PT instead of ER4S. When I want to listen straight from my iPhone 4S I use ER4PT without the resistor adapter. When I'm mixing my music I use it with my resistor adapter through my MOTU digital audio interface at home or the Yamaha 02R/96 mixer in the studio. I normally cross check my mixes between the ER4PT and the Yamaha NS10M studio monitors.
Here's the picture to prove:
Edited by Francisk - 3/18/14 at 10:04am