ATH-M30 Key Features: Exceptional clarity and sonic accuracy for mixing High power handling for tracking sessions Circumaural design ensures superior isolation 40 mm diameter drivers, neodymium magnets and CCAW voice coils Adjustable cushioned headband and lightweight design for maximum comfort OFC litz wire cable, convenient one-side exit Gold-plated 1/8" (3.5 mm) stereo connector with strain relief and professional screw-on 1/4" (6.3 mm) adapter Experience More Freedom A perfect choice for project studio engineers, home recordists and recording musicians, Audio-Technica’s ATH-M30 dynamic stereo headphones offer the highest level of sonic accuracy in a design engineered to provide maximum comfort for hours of listening. The headphones' low-profile, closed-back design provides exceptional clarity and superior isolation in high-volume listening situations. Features include: neodymium magnet structure; lightweight, adjustable cushioned headband; gold-plated stereo 1/8" (3.5 mm) connector with strain relief and screw-on ¼" (6.3 mm) adapter; ultra-flexible 11' cable with single-side exit. Specifications Type: Closed-back dynamic Drive Diameter: 40 mm Magnet: Neodymium Voice Coil: Copper-clad aluminum wire Frequency Respons:e 20-20,000 Hz Maximum Input Power: 1,600 mW at 1 kHz Sensitivity: 100 dB Impedance: 65 ohms Weight: 7.0 oz (200 g) without cable Cable: 11' (3.4 m), OFC litz wire, left-side exit Connector: 1/8" (3.5 mm) with screw-on 1/4" (6.3 mm) adapter