18-in next generation high performance subwoofer, specifically designed for high SPL very low frequency applications in either a reflex, bandpass or horn loaded configuration - Walmart.com
MLF-15 | 15" Raw Woofer Speaker, 250 Watts Pro Audio PA DJ Replacement – Sound Town
STLF-15110ZA | 15" 500W Cast Aluminum Frame Woofer (Low Frequency Driver) – Sound Town