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8" | 81NPM
Neodymium Mid-Woofer
Neodymium Mid-Woofer
Neodymium Mid-Woofer Neodymium 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 HandlingThe 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
Specifications:
  • General specs
    Nominal Diameter: 8 in.
    Rated Impedance: 8 Ohm
    Power handling
    AES Power: 200 Watts
    Program Power: 400 Watts
    Voice Coil
    Diameter: 3 in.
    Winding wire: CCAW
    Former: kapton
    Winding height: 22.5 mm
  • T/S Parameters
    Resonant frequency: 72 Hz
    Re: 5.2 ohm
    Qes: 0.34
    Qms: 7.97
    Qts: 0.33
    Vas: 10.3 liters
    Sd: 219 cm2
    Mms: 40.5 grams
    Bl: 16.7
    Le: 0.5 mH
    Sensitivity: 93 dB
  • Design details
    Surround Material: Fabric
    Cone material: Paper
    Spider: Nomex
    Plate thickness: 10.5 mm
    Peak to peak linear cone Displacement 15 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: 3.2 kg
  • Ordering codes:
    8 ohm version: 81NPMX8-263
    Recone kits:
    Download:
    Spec download
    2D drawing
    3D model
Frequency response & lmpedance
2D drawing
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REDCATT designs and manufactures world class loudspeakers. Additionally to the loudspeakers sold under REDCATT brand name, we also design and manufacture OEM / ODM loudspeakers.
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redcatt

Neodymium Mid-Woofer
Neodymium Mid-Woofer
Neodymium Mid-Woofer
Neodymium Mid-Woofer Neodymium Mid-Woofer
8" | 81NPM
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 HandlingThe 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
Specifications:
General specs
Nominal Diameter: 8 in.
Rated Impedance: 8 Ohm
Power handling
AES Power: 200 Watts
Program Power: 400 Watts
Voice Coil
Diameter: 3 in.
Winding wire: CCAW
Former: kapton
Winding height: 22.5 mm
T/S Parameters
Resonant frequency: 72 Hz
Re: 5.2 ohm
Qes: 0.34
Qms: 7.97
Qts: 0.33
Vas: 10.3 liters
Sd: 219 cm2
Mms: 40.5 grams
Bl: 16.7
Le: 0.5 mH
Sensitivity: 93 dB
Design details
Surround Material: Fabric
Cone material: Paper
Spider: Nomex
Plate thickness: 10.5 mm
Peak to peak linear cone Displacement 15 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: 3.2 kg
Ordering codes:
8 ohm version: 81NPMX8-263
Recone kits:
Download:
Spec download
2D drawing
3D model
Frequency response & lmpedance
2D drawing

Phone: (+86) 769 8318 1898   Email: info@redcatt.net

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