12" Single Vented Enclosure - Slot Vented, High Density Ported Subwoofer Enclosure Box - Pro Audio Sound, Designed To Enhance Subwoofer Sound - By GMI Pro MAXIMUM BASS: GMI Pros Single Vented Enclosure works with your woofer to bring a booming bass to the forefront of your system with the vent so it acts as a built in amplifier. SPACE SAVER: No need for a large amp taking up space. The vent in this enclosure naturally amplifies the bass sound which lets you use a smaller amp for space saving efficiency. TERMINAL CUP/GOLD POST BINDING: Perfect for speakers that utilize a separate amp for woofer and tweeter. Also ideal for dual voice coil subwoofer input and output terminals. PREVENTS OVERHEATING: The vent in this enclosure allows for increased air circulation, which cools your woofer, preventing overheating & ensuring long lasting performance. GREAT FOR CAR SYSTEMS: The design of this single vented enclosure is perfect for car systems, but is suitable for all stereo systems and makes a great tool for audio repair kits.