The full manufacturer's warranty from Yamaha is only valid when the Yamaha YST-SW225 Subwoofer is purchased from an Internet Authorized Dealer. We will match any Internet Authorized Dealer's best price on the Yamaha YST-SW225 Subwoofer. The Yamaha YST-SW225 Subwoofer may be referred to by the following terms: 027108920504, YST-225, YST-SW225, YSTSW225.