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RCF SUB-S12 Passive 12" Bass Reflex Subwoofer – Pro DJ Mart
Single 12' ' Professional Sub Bass Audio Speaker Passive Bass Reflex Subwoofer for Private Cinema - China PA Speaker and PA System price | Made-in-China.com
Focal Sub Air Flat Bass Reflex Subwoofer w/ Integrated 150W BASH Amplifier White - Creative Audio
FBT VHA 118 SA - 2500W 18" Processed Bass Reflex Active Subwoofer