LF
Midrange
8"
81NPM
Code: 81NPMX8-263
Mid-Range/8inch/Neo/Paper/400W/8ohm
Key Features
- EXTENDED FREQUENCY RESPONSE
- 2 demodulation rings powerful motor structure
- Designed for 2-way and multi-way speaker systems
Quick Specs
Impedance
8 Ω
Program Power
400 W
Sensitivity
93.00 dB
Fs
72.00 Hz
Magnet
Neodymium
Voice Coil
76.2 mm
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.
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"
Rated Impedance
8 Ohm
Magnet
Neodymium
Basket Material
Aluminum
Power Handling
AES Power
200 W
Continuous Power
400 W
Peak Power
800 W
Voice Coil
Diameter
76.2 mm
Winding Wire
CCAW
Former
Glass Fiber
Winding Height
22.5 mm
T/S Parameters
Resonant Frequency (Fs)
72.00 Hz
Re
5.20 \u2126
Qes
0.340
Qms
7.97
Qts
0.330
Vas
10.30 liters
Sd
219.00 cm\u00B2
Mms
40.50 grams
Rms
2.30
Cms
0.1200
Bl
16.70 T\u00B7m
Le
0.500 mH
Sensitivity
93.00 dB
Design Details
Surround Material
fabric
Cone/Dome Material
Paper GF
Spider
Nomex
T-Plate
10.5 mm
Xmax (peak)
6 mm
Xmech
16.5 mm
Overall Diameter
210.00 mm
Bolt Circle Diameter
195.50 mm
Baffle Cutout Dia.
186.88 mm
Mounting Holes
8
Depth (flange to rear)
101.30 mm
Net Weight
3.20 kg
Ordering Codes
Product Code
81NPMX8-263
Downloads
Frequency Response & Impedance
2D Drawing
Enclosure Recommendations
Recommended enclosure alignments (sealed): - 1.8 liters (Qtc 0.85): compact, punchy character; system resonance approx. 187 Hz - 2.9 liters (Qtc 0.707): maximally flat Butterworth response (recommended); system resonance approx. 154 Hz - 4.5 liters (Qtc 0.6): extended response, smooth gradual rolloff; system resonance approx. 131 Hz
Frequently Asked Questions
- - EXTENDED FREQUENCY RESPONSE
- - 2 demodulation rings powerful motor structure
- - Designed for 2-way and multi-way speaker systems
Recommended enclosure alignments (sealed): - 1.8 liters (Qtc 0.85): compact, punchy character; system resonance approx. 187 Hz - 2.9 liters (Qtc 0.707): maximally flat Butterworth response (recommended); system resonance approx. 154 Hz - 4.5 liters (Qtc 0.6): extended response, smooth gradual rolloff; system resonance approx. 131 Hz
Outdoor / weather-resistant; high-efficiency vented pa mid-woofer or bass-mid cabinet; weight-critical installs
AES Power: 200 W,
Continuous: 400 W,
Peak: 800 W.
Sensitivity: 93.00 dB (1W/1m).
