If you have never tried in-the-ear headphones you will be astounded by the two I mentioned. They completely outperform any DJ style, earcup, or over-the-ear headphone out there.
i wish I understood the principle of the Sony's. they fire forward and they have a bacward facing vent. They do not fire directly into the ear. Clearly there is some pschoacoustic principle being used here and used well.
These babies put out some bottom.
the Jensons(?) are more conventional yet are also dynamite performers. They too have a backward facing vent. (what does that do?).
I bought a long cable with stereo mini plugs so I can walk around the den while wearing these phones.
The Koss and Sennheiser have been retired.