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.
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Highlights of the REDCATT 21NPW
- 21" professional subwoofer driver with 4 Ohm rated impedance
- 1800 W AES power handling, 3600 W program power and 7200 W peak power
- 96.32 dB sensitivity with 35 Hz resonant frequency
- 5.3" copper voice coil on a glass fiber former
- Triple silicone spider and carbon fiber loaded paper cone for high excursion performance
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Product details REDCATT 21NPW
REDCATT 21NPW 21" Subwoofer 4 Ohm
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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.
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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.
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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.
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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.
