RH-50 are Roland's low-end studio monitor headphones. In spite of which they're quad-driver - they have dedicated tweeters which sound really smooth when the headphones are recabled. Great for saxophones and any treble-based delicate music. RH-50 are much like the K-240 with less detail and an even more raised midrange.

And AKG K-240 Studio are, well, what the name says - studio-standard headphones. Current generation (4th, 55-mm. diaphragms) is quite different from the original, if you want a suggestion, try to hunt down the original silver K-141 or K-240 Sextett (38 mm. diaphragms, K-240 are the circumaural version of K-141) and recable them, then give them a good amp.

You can mix in K-240 (many musicians mix/record in K-271, the closed variant), and frankly, the stock AKG cable is horrid. A replacement cable might cost almost as much as the headphones themselves, but it's worth it.

Housemate kept it for three days or so. Then she released it in the grass near the house's entrance. The poor thing died the next day, of exhaustion.