The AKG K701 headphones are good for critical listening with their great sound quality and surprisingly light weight and comfort for a long use. They have over ear open cups and are connected to audio devices with a cable only.
The AKG K701 specs seem to correspond to the claimed function of critical listening headphones. With the frequency response of 10Hz-40KHz they claim to be hi-end headphones for professional use. The sensitivity of 105 dB allows them to deliver a quality and clear sound at high volumes. With a low impedance of 62 Ohm I can easily use them for quality sound even with mobile devices and MP3 players without an amplifier.
The sound of AKG K701 is incredibly clear and spacious. A wide and airy soundstage is relaxing and pleasant to hear. Well-balanced high, mid, and low ranges flow in a natural river of music in my ears. I should admit the crystal clear trebles that may seem a bit sharp with too crispy tracks. Still, the sound is natural and great for monitoring, mixing, and listening to most genres.
The undetachable cable of 3 m/9.8 ft allows enough space to move in a recording studio or for gaming. You will hardly use them on other occasions for the leaky open cups, so the connectivity seems to me quite enough for the type. It comes with a ¼ (6.35 mm) adapter.
Undetachable cable and no options of foldability makes these headphones not portable. Though they correspond to their function of critical listening for the great comfort for long time wear. The AKG K701 is incredibly lightweight, just 235 g/8.3 oz. The headband is adjustable and not tight. The cups are super comfy and pleasant to touch with the soft cushions. Large and airy open cups do not make ears hot and sweat. The joints and materials seem to be sturdy to undergo drops and serve time.