REDCATT 81NPM - 8 Ohm

REDCATT 81NPM - 8 Ohm Mid-woofer

Key Features

• EXTENDED FREQUENCY RESPONSE
• 2 demodulation rings powerful motor structure
• Designed for 2-way and multi-way speaker systems

Design Notes

The 81NPM was designed for good reproduction of voice. With an extended low-frequency response, this mid-woofer is highly suitable for two-way and multi-way systems. It’s high power handling capabilities extend the ideal usage as a mid-range driver in line-array systems. The 81NPM uses a lightweight half-pressed paper cone reinforced by our proprietary cone treatment, which also works as weatherization protection. The used high-quality components ensure long-lasting performance even in high powered applications. The chosen material combination provides remarkable strength, high efficiency and sustained output under extreme conditions.  Power Handling The voice coil sports Kapton former material capable of withstanding peak temperatures above 300°C, well beyond the thermal requirements of modern audio systems. Former strength provides the ideal transfer of power between the voice coil and the cone assembly and assists in reducing distortion artifacts. By combining this material with state of the art adhesives and our winding voice coil technology, the 81NPM delivers incredibly high performance.

Specifications
General Specs

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

Power Handling

• AES Power: 400 Watts
• Program Power: 800 Watts

Voice Coil

• Diameter: 3 inch
• Winding wire : CCAW
• Former: Glass Fiber
• Winding height: 18,6 mm

T/S Parameters

• Resonant frequency: 69Hz
• Re: 7.1ohm
• Qes: 0,29
• Qms: 4,84
• Qts: 0,28
• VAS: 10.3L
• Sd: 219cm2
• Mms: 34.2g
• BL:  
• Le: 0,75
• Sensivity: 93,05 dB

Design Details

• Surround material: Fabric
• Cone material: Paper
• Spider: Nomex
• Plate thickness: 10,5 mm
• Peak to peak linear cone displacement: 14,55 mm
• Overall diameter: 210 mm
• Bolt circle diameter: 195,5 mm
• Baffle cutout dia: 186,88 mm
• Number of mounting holes: 8
• Depth (flange to rear): 101,3 mm
• Net weight: 3.2kg