AKG K240 Studio Semi-Open Studio Headphones

The K240 Studio is one of the longest-serving studio headphones there is, and the reason is the semi-open design: enough isolation to work, but with the airy, speaker-like top end that closed cans smear. AKG's 30 mm Varimotion diaphragms are thinner at the edge than the centre, which is where the wide dynamic range comes from. The self-adjusting headband fits without fiddling, and the cable detaches — the part that fails first on any studio headphone.

• Semi-open
• Varimotion 30 mm
• Detachable cable
• Studio standard