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.
- 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)
||Nominal impedance (Zn)
|Mechanical Q factor (Qms)
||DC resistance (Re)
|Electrical Q factor (Qes)
||RMS power handling
|Total Q factor (Qts)
|Equivalent volume (Vas)
Here's the full datasheet: