REDCATT 81FHW - 4 Ohm

REDCATT 81FHW - 4 Ohm Woofer

Key Features

• Good low frequency response
• Lightweight surround, stiff paper cone
• Affordable woofer

Design Notes

The 81FHW woofer was designed with smaller hi-fi subwoofers in mind. The woofer works well in vented enclosures or combined with a passive radiator. 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.

Specifications
General Specs

• Nominal Diameter: 8 inch
• Rated Impedance: 4 Ohm

Power Handling

• AES Power: 100 Watts
• Program Power: 200 Watts

Voice Coil

• Diameter: 1,4 inch
• Winding wire : Copper
• Former: Aluminum
• Winding height: 18,2 mm

T/S Parameters

• Resonant frequency: 39Hz
• Re: 3.6ohm
• Qes: 0,58
• Qms: 5,4
• Qts: 0,52
• VAS: 21.5L
• Sd: 201.1cm2
• Mms: 44g
• BL: 8.25
• Le: 1,12
• Sensivity: 85,94 dB

Design Details

• Surround material: Foam
• Cone material: Paper
• Spider: Nomex
• Plate thickness: 6 mm
• Peak to peak linear cone displacement: 12,1 mm
• Overall diameter: 209 mm
• Bolt circle diameter: 197 mm
• Baffle cutout dia: 180 mm
• Number of mounting holes: 8
• Depth (flange to rear): 95 mm
• Net weight: 1.7kg