Quadral Vulkan Mk IV


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The Quadral Vulkan Mk IV is a remarkable loudspeaker produced by All-Akustik, Vertriebs-GmbH & Co. KG in Germany between 1989 and 1992.

  • Type: 3-way transmission line box
  • Power Handling (Sinus/Music): 200 W / 250 W
  • Sensitivity (1W/1m): 86 dB (as stated for the MK III)
  • Frequency Range: 20 – 50,000 Hz (±2 dB)
  • Crossover Frequencies: 180 Hz / 3,800 Hz
  • Impedance: 4 Ω
  • Drivers:
  • Woofer: 10.2-inch (260 mm) dynamic cone
  • Midrange: 5.2-inch (132 mm) dynamic cone
  • Tweeter: Ribbon tweeter with an area of approximately 6.2 cm² (equivalent to a 25 mm dome)


  • Dimensions: 1300 mm (height) x 378 mm (width) x 461 mm (depth)
  • Weight: Approximately 75 kg
  • Finish: Antique walnut.

The Vulkan Mk IV follows the same TML (Transmission Line) principle as the Titan and Vulkan models. However, in its penultimate development stage (before the Mk V version introduced in 1993), it exhibits some differences, including the updated chassis, overall tuning, and altered dimensions. Notably, the box’s efficiency has improved by 4 dB.

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