Superlux HD688 Headphone Audio Monitoring. It with a triple-layer diaphragm that has been custom-made for ultra-high precision to reproduce natural sounds more accurately and with less colouring. Especially for the flexibility and enduring attractiveness of the bass instrument, which is ideal for pop and rock, you can hear the crisp resolution of each component and open sound field.
• Tailored ultra-high precision double layers film design.
• Low distortion, keep high sound quality.
• Detachable single side design.
• 40 Ω impedance to provide best use with portable device which can also be used with the high-definition headphone amplifier system.