VIFA M21 WG 09-08 Pair for Heybrook HB1, Snell Type K, JPW P1, AP2, AP3

Description: VIFA M21 WG 09-08 Pair for Heybrook HB1, Snell Type K, JPW P1, AP2, AP3This product data sheet is originally written in English. This auction is for a pair of newly manufactured bass drivers of the type M21-WG-09-08. These are an 8 ohm driver and are intended for use in sealed box (infinite baffle) speaker cabinets. They were commonly used in Hifi speakers throughout the 1980's and 1990's in designs such as the Heybrook HB1, JPW P1, AP2 and AP3 and the Snell Type K. However, units produced during that period will, by now, have suffered from rotting foam surrounds and will need to be repaired or replaced. Several companies offer re-foaming kits for generic 8 inch speaker drivers. The foams supplied often do not exactly match the foam originally used. Fitting the kits also requires that the speaker assembly is accurately aligned centrally such that the voice coil is perfectly located in the magnet gap. Any deviation will result in increased distortion and possibly buzzing as the voice coil rubs against the edges of the magnet gap. In recent years the Vifa brand was acquired by the Tymphany Corporation and production of many of its new drivers was moved to the far east. What was the Vifa factory is now owned & still operated in Denmark by high end driver manufacture ScanSpeak. The factory still makes the original M21 drivers using the original tooling, jigs & personnel and the drivers offered in this auction are new production items. M21 refers to the magnesium, die-cast 21cm chassis. I am told by Scanspeak that the formulation of the foam surrounds used now will not deteriorate over time in the way that the old ones did. The auction also includes a pair of precision cut gaskets to allow for an airtight seal between driver and cabinet. Technical Data: Frame diameter: 215mm Sensitivity (2.83v/1m): 90dB Nominal impedance: 8 ohm Frequency range: 25Hz-3kHz Free air resonance: 25Hz DC resistance (Re): 5.6 ohm Voice coil inductance (Le): 0.9mH Effective piston area (Sd): 231.0cm² Moving Mass (Md): 16.5g Force factor (BL): 5.2Tm Qms: 4.9 Qes: 0.82 Qts: 0.7 Vas: 81L Voice coil diameter: 25mm Nominal power handling: 80w Physical Dimensions: Frame diameter: 215mm Overall depth (front of frame to rear of magnet): 78mm Flange thickness: 4.5mm Fixing holes: 4 x 5mm diameter on 206.5mm PCD Cut-out diameter: 190mm However, units produced during that period will, by now, have suffered from rotting foam surrounds and will need to be repaired or replaced. Several companies offer re-foaming kits for generic 8 inch speaker drivers. The foams supplied often do not exactly match the foam originally used. Fitting the kits also requires that the speaker assembly is accurately aligned centrally such that the voice coil is perfectly located in the magnet gap. Any deviation will result in increased distortion and possibly buzzing as the voice coil rubs against the edges of the magnet gap. In recent years the Vifa brand was acquired by the Tymphany Corporation and production of many of its new drivers was moved to the far east. What was the Vifa factory is now owned & still operated in Denmark by high end drive EAN Does not apply MPN Does Not Apply Brand Vifa Compatible Brand Made by Scan-Speak Country/Region of Manufacture Denmark Model M21 WG-09-08 Type Woofer Pair Size 8"

Price: 305.06 USD

Location: Tavistock

End Time: 2024-03-12T11:36:22.000Z

Shipping Cost: 27.97 USD