I just listened to the YouTube clip on Westone 3s through a computer, so YMMV, but it has that 'closed' sound that stack tapes have.
I find it helps to boost the highs (8kHz-12kHz), maybe play with the 1-3kHz vocal range, and scoop some of the stuff in the 150-350 range a few dB.
I'd also, if you have one, play with some "harmonic exciters" and possible one of the plugins that increases the width of the image. Ozone has some that might help.