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Visaton W 100 S 8 Ohm, 4 Inch, HiFi Woofer

W 100 S · 8 Ω · part 9021 — Product photo

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W 100 S · 8 Ω · part 9021 — Product photoProduct photo W 100 S · 8 Ω · part 9021 — Dimension drawingDimension drawing W 100 S · 8 Ω · part 9021 — Response and impedanceResponse and impedance W 100 S · 8 Ω · part 9021 — Directivity patternDirectivity pattern

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W 100 S · 8 Ω · part 9021 — Product photo

Product photo

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Part number: 9021

A 10 cm bass-midrange driver for compact hi-fi speakers and the low-midrange of three-way systems.

Nominal size
10 cm / 4 inch
Impedance
8 Ω
Rated power
30 W
Cut-out
94 mm
Sensitivity
86 dB (1 W/1 m)
Resonance
63 Hz
ex VAT
£34.74 inc VAT
Maximum quantity available reached.

Stock and dispatch
Selected products are held in UK stock; other lines are sourced to order. Dispatch timing depends on the product and quantity.

Delivery information. Need it for a specific date? Ask us.

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Description

The W 100 S pairs a coated paper cone with an elastic rubber surround and a 20 mm voice coil, and its balanced response suits it either to woofer duty in small enclosures or to the low-midrange band of a larger system. This 8 Ω version handles 30 W rated power, resonates at 63 Hz and has a d.c. resistance of 6.7 Ω.

Typical applications

  • Compact hi-fi speakers
  • Three-way hi-fi speakers (bass/midrange)
  • Subwoofer and satellite systems
Full specifications
W 100 S · 8 Ω
Rated power30 W
Maximum power50 W
Nominal impedance8 Ω
Frequency response (−10 dB)fu–15000 Hz (fu: lower cut-off depends on the cabinet)
Mean sound pressure level86 dB (1 W/1 m)
Opening angle (-6 dB)86°/4000 Hz
Excursion limit±4 mm
Resonance frequency fs63 Hz
Magnetic induction1 T
Magnetic flux250 µWb
Height of front pole-plate4 mm
Voice coil diameter20 mm
Height of winding8 mm
Cut-out94 mm
Net weight0.49 kg
D.C. resistance Rdc6.7 Ω
Mechanical Q factor Qms2.74
Electrical Q factor Qes0.67
Total Q factor Qts0.54
Equivalent volume Vas5.41 l
Effective piston area Sd53 cm²
Dynamically moved mass Mms4.7 g
Force factor Bxl4.29 Tm
Inductance of the voice coil L0.9 mH
Terminals4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-)
Dimensions and drawings
W 100 S · 8 Ω · part 9021 — Dimension drawing

Dimension drawing · Open original image

Installation and cabinet guidance

Allow a 94 mm cut-out for a frame that measures 122 mm across, with the fixing holes on a 111 mm circle for 3.7 mm screws; mark the hole positions from the driver itself before drilling. Behind the baffle allow about 48 mm of clear depth for the basket and its 70 mm magnet, with room beyond that for the terminals and the wiring.

Fit it to a rigid baffle with a continuous gasket or sealing strip between the frame and the panel, and tighten the fixings evenly and only enough to seal so the frame is not pulled out of shape. Check that the cone and the rubber surround stay clear of the grille and of any internal bracing. Allow for the ±4 mm of cone travel where a grille sits close to the cone.

The terminals take 4.8 x 0.8 mm blades on the positive side and 2.8 x 0.8 mm on the negative, so blade size identifies polarity. Use matching push-on connectors, observe polarity, insulate the joints and keep the wiring clear of the moving parts, and choose an amplifier or crossover suited to the 8 Ω load.

Visaton's published enclosure suggestions for this driver: 4 l closed (fc 96 Hz, Qtc 0.82); 5 l bass reflex with one BR 6.8 port cut to 6 cm (fb 70 Hz); 10 l bass reflex with one BR 6.8 port cut to 5 cm (fb 56 Hz).

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