SK1X18V | Single 18" Ported Universal Fit Subwoofer Box - Skar Audio
Single 18 Inch Professional Subwoofer Active Speaker Box, 1200 Watt
D4S SUBWOOFER BOX
Amazon.com: ASC Single 18" Subwoofer 1" MDF Universal Fit Vented Port Sub Box Speaker Enclosure : Electronics
L-8028 Dual 18 inch High Power Pro Subwoofer Box - Buy 18 inch subwoofer, high power subwoofer, s8028 subwoofer speaker Product on Sanway Professional Audio Equipment Co., Ltd.