18" | 18NPW
Neodymium Woofer
Key features:
- STRONG GLASS FIBER LOADED CONE
- HIGH TEMPERATURE VOICE COIL, DOUBLE LAYER SILICONE SPIDER
- HIGH POWER HANDLING
Design notes:
The 18NPW is a high efficiency, (98 dB 1watt / 1 meter) 18-inch woofer with incredibly linear frequency response characteristics, extreme high power handling capability while generating low harmonic distortion artifacts. The 18NPW uses a lightweight, but strong, glass fiber loaded cone assembly along with a high excursion triple roll constant geometry surround. This combination provides remarkable strength, high efficiency and a peak to peak maximum excursion of 30mm. Power HandlingAt the core of the 18NPW is it’s voice coil technology featuring a composite Polyimide former material capable of withstanding peak temperatures in excess of 350°C, well beyond the thermal requirements of modern professional audio systems. The 18NPW delivers incredible performance. REDCATT has implemented a double layer/silicone spider design to ensure long term Fs memory, consistency and diminish anomalies associated with spider deterioration. The sealed spider works as a air pump and pushes the air trough out motor to increase heat transfer and cooling of the parts.
Specifications:
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General specs |
Nominal Diameter: |
18 in. |
Rated Impedance: |
8 Ohm |
Power handling |
AES Power: |
1,200 Watts |
Program Power: |
2,400 Watts |
Voice Coil |
Diameter: |
4 in. |
Winding wire: |
Copper |
Former: |
Glass-fiber |
Winding height: |
23.7 mm |
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T/S Parameters |
Resonant frequency: |
36 Hz |
Re: |
5.1 ohm |
Qes: |
0.28 |
Qms: |
8.39 |
Qts: |
0.28 |
Vas: |
211.5 liters |
Sd: |
1,257 cm2 |
Mms: |
199.4 grams |
Bl: |
27.3 |
Le: |
1.51 mH |
Sensitivity: |
99.14 dB |
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Design details |
Surround Material: |
Fabric |
Cone material: |
Paper |
Spider: |
Nomex |
Plate thickness: |
14 mm |
Peak to peak linear cone Displacement |
10.7 mm |
Overall diameter: |
468 mm |
Bolt circle diameter: |
442 mm |
Baffle cutout dia.: |
426 mm |
Number of mounting holes: |
8 |
Depth (flange to rear): |
189 mm |
Net weight: |
9.4 kg |
Ordering codes: |
4 ohm version: |
18NPWX4-276 |
8 ohm version: |
18NPWX8-017 |
16 ohm version: |
n/a |
Recone kits: |
4 ohm version: |
RC18NPWX4-276 |
8 ohm version: |
RC18NPWX8-017 |
16 ohm version: |
n/a |
Frequency response & lmpedance
2D drawing