Sennheiser HD 650 Open Back Professional Headphone

• Specially designed acoustic silk ensures precision damping over the entire frequency range and helps to reduce THD to an incredible 0.05%
• Improved frequency response is 10 - 39,500 Hz (-10 dB)
• Hand-selected matched driver elements
• High power neodymium magnets deliver maximum efficiency
• Lightweight aluminum voice coils for very fast transient response