From an old MB Quart brochure (circa late 80s): The Quart Phone 50 Dynamic, semi-open headphone....

MB Quart 50 Headphones

  • From an old MB Quart brochure (circa late 80s):

    The Quart Phone 50
    Dynamic, semi-open headphone. Coupling: circumaural. Frequency response: 10 Hz - 22 kHz. Nominal Impedance: 120 ohms (x2). Sound Pressure Level: 96 dB. Rated Power Handling: 0.1 watt. Distortion <0.5%. Weight (without cord): 245 grams.

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