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Vifa M21WG-09-08 Heybrook HB1, Snell Type K, JPW P1 / AP2 / AP3 Woofer

Vifa M21WG-09-08 Woofer.


Direct replacement for:

Heybrook HB1,  JPW P1,  JPW AP2,  JPW AP3,  Snell type K.

This classic 8" bass unit is designed for sealed cabinets of between 20 - 40 litres. It features a very high compliance suspension (Vas 81 litres), a magnesium chassis and a treated pulp cone. The highish Qms value gives the M21WG-09-08 a lovely open midrange sound hence it's popularity in various successful historic designs. One of the few excellent 8" drivers suitable for 2 way infinite baffle enclosures. New manufacture with improved foam surround.

These units are now manufactured at the Scanspeak facility in Denmark and may be badged as Vifa or Scanspeak.

Key Features:

  • Air dried coated black pulp cone
  • Optimised for sealed box designs
  • New formulation rot proof foam surround
  • High efficiency 90 dB 1w / 1m.
  • Excellent midrange extension for an 8" design

Basic parameters:

Resonant frequency (fs) 38 Hz Nominal impedance (Zn) 8 Ω
Mechanical  Q factor (Qms) 4.9 DC resistance (Re) 5.6 Ω
Electrical Q factor (Qes) 0.82 RMS power handling 50 W
Total Q factor (Qts) 0.70 Sensitivity (2.83V/1m) 90 dB
Equivalent volume (Vas) 81L Chassis diameter 215 mm

Here's the full datasheet:

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