Redcatt 81FHWX4 4 ohm 8-inch Woofer speaker

The 81FHW woofer was designed with smaller hi-fi woofers in mind. The woofer works well in vented enclosures. Optimized magnetic structure delivers good level of performance and balancing well performance vs cost. We have chosen lightweight foam surround in this design. Our extensive development and testing of this material yielded in custom formulation of the raw material we use for the surround and guaranties its long lasting performance.

General specifications

Nominal Diameter: 8 in

Rated Impedance: 4 ohm

Power handling

AES Power: 50 Watts

Program Power: 100 Watts

Peak Power: 200 Watts

Voice Coil

Diameter: 1.4 in.

Winding wire: Copper

Former: Aluminum

Winding height: 18 mm

T/S Parameters

Resonant frequency: 44 Hz

Re: 3.93 ohm

Qes: 0.62

Qms: 5.4

Qts: 0.56

Vas: 17.5 liters

Sd: 201 cm

Sensitivity: 2 85.9 dB

Mms: 43 grams

Bl: 8.7

Le: 0.9 mH

Design details

Surround Material: Foam

Cone material: Paper

Spider: Single conex 6 mm

Plate thickness: 6 mm

Peak to peak linear cone Displacement 18.6 mm

Overall diameter: 150 mm

Bolt circle diameter: 1250 mm

Bafƃe cutout dia.: 98 mm

Number of mounting holes: 8

Depth (ƃange to rear): 22 mm

Net weight: 10.0 kg

Ordering codes:

4 ohm version: 81FHWX4-289

8 ohm version: N/A

16 ohm version: N/A

Recone kits:

4 ohm version: RC81FHWX4-289

8 ohm version: N/A

16 ohm version: N/A