Yamaha HP-1 specifications

Brand: Yamaha

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• Type: orthodynamic headphone
• Drive units: 55mm
• Impedance: 150Ω
• Frequency Response: 20Hz to 20kHz
• Input: 3000mW (nominal), 10000mW (max)
• Maximum SPL:
• Distortion: 0.3%
• Cord length:
• Weight: 290g
• Price:
• Year: 1976