The HD681 headphones feature a semi-open design intended for use in professional monitoring applications.These headphones feature premium quality audio components paired with an ergonomic design. The self-adjusting headband provides the listener with a great fit and these durable headphones can even be twisted for use in single ear monitoring. The HD681 professional headphones are lightweight and enable long sessions without experiencing ear fatigue.Special attention has been paid to the materials and construction of the earmuffs which make them easily adjustable and exceptionally comfortable. The HD681 features 50mm dome type neodymium drivers, a 10 Hz – 30 kHz frequency range and total harmonic distortion of less than 0.25%. They deliver a rich balanced sound with high resolution, wide dynamic range and excellent stereo imaging.Shipped with a protective storage pouch and gold-plated 3.5mm to 1/4 inch screw-on adapter, the HD681 headphones are an excellent choice for a wide range of audio listening tasks, including recording studio monitors, headphones for MP3 players or video games, computer/digital audio or any pro audio application.