Meze Audio's inaugural dynamic open-back headphones deliver emotionally resonant sound through meticulous engineering and premium materials. The proprietary 50mm driver features a Dual-Composite Diaphragm combining Beryllium-coated polymer with cellulose-carbon fiber, paired with a copper-zinc stabilizer ring that minimizes distortion. A carbon fiber-reinforced W-shaped dome reproduces high frequencies with exceptional clarity, while the ultra-thin Beryllium-coated torus ensures fast transient response and neutral character. The open-back design, with its spider-shaped acoustic grill, creates an expansive soundstage with vivid detail and engaging dynamics. Ergonomically refined with velour cushions and a self-adjusting headband, the 109 PRO combines walnut wood, zinc, and manganese steel construction for lightweight durability. Designed for endless serviceability, these headphones prioritize longevity and environmental responsibility while remaining easy to drive from any source. Specifications Transducer Size: 50mm Frequency Response: 5Hz - 30KHz Sensitivity: 112dB SPL at 1KHz, 1mW Impedance: 40 Ω Weight: 375 gr (13 oz) without cables Ear-Cups Black Walnut Wood Accessories Case: Hard EVA pouch Included cables: - 1.5 m soft TPE cable, with black aluminum casings,ending with a 3.5 mm jack - 3 m soft TPE cable, with black aluminum casings,ending with a 3.5 mm jack Headphone termination: - 3.5 mm TRS jack Included adapters: - 6.3 mm gold-plated jack Warranty period: 2 years