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The REDCATT 21NPW is a high-power 21" professional subwoofer driver with a neodymium motor, 4 Ohm impedance and high sensitivity for demanding low-frequency applications.
REDCATT 21NPW 21" Subwoofer 4 Ohm
The REDCATT 21NPW is a high-efficiency professional woofer designed for serious low-frequency output. With a neodymium magnet system, aluminum basket and 96.32 dB sensitivity, it delivers strong acoustic performance while keeping the driver weight to 14.85 kg.
At the core of the 21NPW is a large 5.3" copper voice coil with a glass fiber former, built to handle demanding thermal loads. The driver is rated at 1800 W AES, 3600 W program power and 7200 W peak power, making it suitable for high-output professional audio systems where reliability and headroom are essential.
The cone assembly combines a carbon fiber loaded paper cone with a fabric surround and triple silicone spider. This construction supports linear low-frequency movement, long-term Fs consistency and a peak-to-peak maximum excursion of 31 mm. The 21NPW is well suited for large-format vented or horn-loaded subwoofer systems, infra-bass applications, outdoor use and weight-critical installations.
For enclosure design, REDCATT recommends bass reflex alignments of 125 liters tuned to 38 Hz for high output, 150 liters tuned to 34 Hz for a balanced general-purpose setup, or 175 liters tuned to 29 Hz for extended low-frequency response with suitable high-pass protection. Installation dimensions include a 496 mm baffle cutout, 520 mm bolt circle, 8 mounting holes and 245 mm mounting depth, making it a powerful choice among professional audio components.
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Speakers
Amplifiers
DAC converters
DSP modules
Turntables
Streamers
Woofers
Tweeters
Exciters
Bass shakers
Plate amplifiers
Amplifier modules
Single board computers
Assembled crossovers
Printed Circuit Boards (PCB)
Capacitors
Resistors
Coils
Circuit Breakers
Crossover tools
Screw terminals
Acoustic measurements
Electric measurements
Sound level meters
DIY amplifier kits
DIY component packs
DIY speaker kit
DIY subwoofer kits
DIY bluetooth speaker
DIY electronics kits
Binding posts
Cabinet Hardware
Cables
Connectors
Speaker cabinets
Electromechanics
Power supplies
Speaker repair
Workshop & tools
Amplifier accessories
Stands & mounts
Gift voucher
Books
New products
