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I use these headphones for monitoring and mastering field recordings at home. They are comfortable. They don't exert excessive pressure on the head and the headband is designed to keep them seated right. These are heavier than most headphones used with portable audio devices, but the combination of low sideways pressure and stable headband make them a good choice for extended listening.
The ear pads that cover the ears, though they are not totally closed back. They do, however, offer a decent amount of acoustic isolation from sounds in the listening room, but they wouldn't keep a drum kit out of the lead vocalist's foldback feed on stage.
Overall sound quality is smooth and listenable, they do not have the pumped-up bass that is all too common on cheaper headphones to impress casual listeners, though like all headphones the stereo imaging and bass response is quite different from listening on speakers.
The headphone cable is terminated in a gold-plated stereo 3.5mm jack which is the right size for an Ipod or typical portable audio device, but AKG do supply an adaptor that turns this into a regular 1/4 inch jack. The adaptor can be screwed onto the 3.5 mm plug which is a nice touch so it won't always end up getting lost.
At the headphone end the cable is attached with a mini-XLR going into the left earpiece, so you don't easily get strangled by the headphone cable if you stand up forgetting they were there.
The Studio version of these classic hi-fi stereo headphones uses XXL speakers with Varimotion diaphragms for higher sensitivity, a wider dynamic range, and higher sound levels. Other features include semi-open earphones, a solid bass range, clear highs, and excellent comfort. Also connects to portable equipment (CD players, DAT recorders, notebook computers, etc.)