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Engineered by Masters of Sound. Optimised Cabinet. P9 Signature's elegant earcups contain sophisticated acoustic cabinets perfected using Finite Element Analysis. Using composites and aluminium this optimised acoustic environment enables the drive unit to do its job of rendering your music with total precision. De-coupled Headband. P9 Signature's headband cleverly decouples each earcup. This stops unwanted vibration transmitting between each earcup and the headband. This removal of distortion is one of the reasons P9 Signature is so clear and open sounding. Perfect Piston. Our engineers developed an advanced new drive unit for P9 Signature with a clever suspension system that enables it to provide precision at high frequencies and compliance for great bass. Features: Nylon damped cone with acoustic coating Large surround diaphragm CCAW coil with external large pole magnet Dual cavity ear cushions Changeable ear cushions Detachable cable Folding (hinged) design Inputs: 3.5mm stereo jack (TRRS 4-pole CTIA spec.) 3.5mm stereo jack (TRS 3-pole unbalanced stereo spec.) Drive units: 2x 40mm (1.6in) full range Frequency range: 2Hz to 30kHz Impedence: 22 ohms Distortion (THD): Sensitivity: 111dB/V at 1kHz Max. input power: 50mW Net weight: 413g Apple compatibility: The remote and mic are supported by iPhone 3GS and later, iPod Touch 2nd generation and later, iPad all models. The remote is supported by iPod Classic all models, iPod Nano 4th generation and later, iPod Shuffle 3rd generation and later.