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Moondrop Joker Headphone Professional Monitoring Closed-Back Dynamic Full-Size Headset with 3.5mm Stereo PlugProduct Information: Product Name: Joker closed-Back Professional Monitor Headphones Diaphragm: Partially Rigid composite Diaphragm Frequency Response Range: 15Hz-22kHz Effective Frequency Response Range: 20Hz- 20kHz (IEc60318-4,3dB) Sensiti..