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You should immediately contact your dealer if the subwoofer is damaged . 2. INSTALLATION There are different methods to connect your subwoofer to a HiFi / Home Theater system. In the following text we explain 2 different ways. NOTE! Do not connect the mains cord until all other installation is completed. 2.1 To an amplifier / pre-amplifier with Subwoofer pre-out terminal. Connect the enclosed RCA cord from your amplifiers subwoofer-out terminal to LINE IN on the subwoofer. Use the anclosed Y-ada