GT X1200 subwoofers are optimized to perform best in small,sealed, vented and prefabricated band pass enclosures. Your GT X1200 subwoofer has a single 4 ohm voice coil. Be sure toconsider your amplifiers optimum load when designing a subwoofer system. Many bridgeable 2 channel amplifiers are optimized to drive a single 4 ohm subwoofer in bridged mode. If you will use multiple subwoofers, be sure to configure them to extract all the power available your amplifier.