Vifa M21WG-09-08 Heybrook HB1 Woofer
Vifa M21WG-09-08 Bass / Midrange
Classic 8" bass unit designed for sealed cabinets of between 20 - 40 litres. Very high compliance suspension (Vas 81 litres), magnesium chassis, treated pulp cone. The highish Qms value gives this drive unit 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.
Direct replacement for the following models:
Heybrook HB1, JPW P1, JPW AP2, JPW AP3, Snell type K.
These units are now manufactured at the Scanspeak facility in Denmark and may be badged as Vifa or Scanspeak.
- 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
|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:
Priced as singles, including VAT.