JBL JRX218S 18″ Compact Passive PA Subwoofer
The JRX218S is driven by a massive JBL 18″ woofer with a cast frame and 3″ voice-coil.

Features:

18 in. compact subwoofer.
350 W (continuous), 1400 W (peak) power capacity.
The rugged enclosure is constructed from 19 mm (.75 in) MDF (Medium Density Fiberboard) using advanced adhesives and mechanical fastener technology for durability and improved low-frequency performance. The enclosure is covered in black carpet.
A top mounted, cast aluminum 35 mm pole mount receptacle can receive an optional SS3BK pole to facilitate use of the JRX218S as a base for a midhigh speaker cabinet.
Non-resonant, all steel handles are used.
Attractive 18-gauge perforated steel grille protects components from damage.