A whole new category on its class!

The new 21SW4000-NDY-2 is an advanced, high-strength Neodymium subwoofer driver featuring a 5.3” inside/outside copper coil with an unique dual forced design ventilation system.
Featuring a 2 ohms voice coil and unmatchable low frequency output with a fully optimized T-pole design, this 21” subwoofer creates a whole new category on its class!

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See more at – https://prvaudio.com/products/21sw4000-ndy-2/