warm yes... sometime pretty darn warm, but never what I would consider hot.
you know, laser beam and all.
I use the cheek test, if I can hold it on my cheek... then it's really not that hot.
same for me... I could not find them on the website so I gave up looking for them. I figured they stopped selling them.
to be honest when I last saw them, some of them are really not designed well, but a few of them are.
I've never heard of the Klipsch 4m headphone... a picture would be nice.
is this it?
those look like a knockoff of the s4 headphone. maybe someone at klipsch will reply here
Distortion (THD and IMD) over the full audio and power range is negligible, typically below 0.0007%
very nice... put it in a box and people will probably buy it.