JBL STX818S Single 18-Inch Bass Reflex Subwoofer – Audio MIDI Plus
One unit (not pair) |15 Inch Woofer for Bass Compensation of Open Baffle or Cabinet | W-15 - Lii Audio, unique speaker, amplfier, quality and cost-saving parts for HiFi DIY
American Bass XMAXXX 15" 4000w RMS Subwoofer - 1800woofers.com