Because I hate my roomates, and they are annoying as hell, I needed to tune them out. Anyways, my brother back home bought these and recommended these to me, so I picked up a pair. They are advertise at 5.1 SS headphones. I figured all headphones are SS lol Best head phones ever These headphones have an external soundcard on them, and when you use it, the sound is amazing. You can actually feel a little vibration from them when you play them loud. Also, when you turn them up to normal volume, you can't here noise from anywere else. Its great. These are defently pretty much a non portable system. the head phone wires themselves are close to 20 ft long, then the power unit or what ever you want to call it is another 2 ft or so, so this unit would suck for running, but its great for a home, office, what ever. You can also hook the thing up to tv Via RCA cables. It comes with 4 other cords, and you use them depending on what your hooking them up to. Only problem that I hate about them, my cell phone signel sometimes screws up the transmission of the signel in the headphone wire, and it ends up having loud beeps.