271 and 272 are still going to need an amp. They will still sound OK out of a larger portable at least.
For some very stupid reason the 271 and 272 HD are overpriced at most websites.
Those are a closed version of the AKG K240 Studio. The studio is only $99!
The MK II version price is terrible and usually an extra $50-$70! The only difference is that it seems to have a slightly different design and comes with an extra pair of pads that are velour and also includes an extra coiled cable. Sound is the same. FYI the K240 cable is straight and removable.
I highly suggest saving some money and getting the K240 Studio for $99. It's far better then the MDR-V6 to me.
Don't listen to peoples comments that say it's bass heavy. The bass is very well controlled and I don't find it too have too much bass. Not even a lot of mid-bass.
I guess you could say the k240 is just like a 271/272 with more bass. It's semi open, but doesn't seem to leak sound too badly at all.
The mids/vocals are also very, very good. Right now it's one of my favorite headphones and they're extremely comfortable and light.
My DJ 100 has way better vocals, but the k240 does most everything else slightly better and is better for more genres. It's soundstage is also better and the highs are less rolled off.
EDIT: Sorry, forgot to mention that despite being 50ohms, the K240 needs an amp. It even makes my Total Airhead complain sometimes and that's a very good portable amp.
A good amp also seem to also make the bass a little more controlled. I still can't figure out why so many people say it has so much bass. Maybe it gets toned down after burn-in or something.
It reminds me of the very well controlled bass of the DT-770 32 ohm.
BTW I also found the MDR-V6 to be too bassy (which doesn't seem to make sense!) and there was something missing from the vocals. Someone in another thread posted what this was, but I've totally forgotten! The highs of the K240 are about the same as the SRH-840. Not fatiguing really and just about perfect. It's not a laid back headphone like some Sennheisers though. The k240 seemed to have a lot more bass right out of the box, but not so much after burn-in.
Edited by tdockweiler - 10/12/10 at 7:23pm