Sensitivity: 98dB SPL/1mW, Playback frequency band: 10-30,000Hz
Maximum Input: 300mW, Impedance: 32Ω
Cable: A straight cable that can be detached from the headphone, comes with two types of 3.3 ft (1 m) and 3 m), Connector: 0.1 inch (3.5 mm) diameter gold-plated stereo mini plug
Accessories: 0.1 inch (3.5 mm) diameter 0.25 inch (6.3 mm) diameter gold plated conversion plug, headphone cable 3.3 ft (1 m), 9.8 ft (3 m), headphone cable lock clip, carrying pouch
Selling models HD681 headphones are high cost, with rich bass and crystal clear high resolution and accurate sound field positioning. Its upgraded version HD681 EVO has a new shape, and the continuation of the first generation HD681 sounds descent, but more slender treble performance.