Home » DIY PA Subwoofer Cabinet Kits » 18" Subwoofer DIY Kits 9 Per Page18 Per Page27 Per Page36 Per Page45 Per Page Simplexx 18 Subwoofer Deluxe Kit Price: USD $284.95 Simplexx 21 Subwoofer Deluxe Kit Price: USD $789.95 Simplexx 18 Flat Pack Subwoofer Price: USD $179.95 Simplexx 21 Subwoofer Kit Price: USD $889.95 Simplexx 21 Flat Pack Subwoofer Price: USD $209.95