21" | 21NPW
Neodymium Woofer
Key features:
- 5.3” diameter voice coil
- 3600 watts program power handling
- Triple silicone spider, heavy duty fiber reinforced cone with large surround
Design notes:
- The 21NPW is a high efficiency, (96 dB 1watt / 1 meter) 21-inch woofer with incredibly linear frequency response characteristics, extreme high power handling capability while generating low harmonic distortion artifacts. The 21NPW uses a lightweight carbon 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 31mm. Power HandlingAt the core of the 21NPW is it’s voice coil technology featuring a composite Polyimide former material capable of withstanding peak temperatures in excess of 350C, well
- beyond the thermal requirements of modern professional audio systems. The 21NPW delivers incredible performance. REDCATT has implemented a triple layer/silicone spider design to ensure long term Fs memory, consistency and diminish anomalies associated with spider deterioration.
Specifications:
General specs Nominal Diameter: 21 in. Rated Impedance: 4 Ohm Power handling AES Power: 1,800 Watts Program Power: 3,600 Watts Voice Coil Diameter: 5.3 in. Winding wire: Copper Former: kapton Winding height: 33 mm T/S Parameters Resonant frequency: 35 Hz Re: 3 ohm Qes: 0.33 Qms: 11.12 Qts: 0.32 Vas: 149 liters Sd: 1,662 cm2 Mms: 514 grams Bl: 32.9 Le: 1.14 mH Sensitivity: 96.32 dB Design details Surround Material: Fabric Cone material: Paper Spider: Nomex Plate thickness: 15 mm Peak to peak linear cone Displacement n/a mm Overall diameter: 546 mm Bolt circle diameter: 520 mm Baffle cutout dia.: 496 mm Number of mounting holes: 8 Depth (flange to rear): 245 mm Net weight: 14.85 kg Ordering codes: 4 ohm version: 21NPWX4-018 Recone kits: Download: Spec download 2D drawing 3D model
Frequency response & lmpedance
2D drawing
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