Yorkville PSA1SF Paraline Series Active Subwoofer With Flying Hardware 1400W - 12"The 1400W PSA1S Paraline Series 12" Active Subwoofer from Yorkville Sound is a dual 12" bass reflex subwoofer that comes with flyware and is best paired with the PSA1 full range loudspeaker system (sold separately). Its solid 15mm birch plywood cabinet construction and an integrated all metal pole mount adaptor make the PSA1S an ideal platform for stacking PSA1 cabinets in a scalable array system. Compact design and heavy duty wheels & handles ensure