Gravity Audio G12BD1 Single 12" 1000W Loaded Warzone Competition Series Vented Subwoofer Enclosure Built in Amplifier 4 Ohm with High Premium Wood - 12 Inches - Universal Fit Benefits of Subwoofer Boxes. Optimal subwoofer performance. A subwoofer typically produces sound from the back and front. Without an enclosure, the sound from the back of the speaker would cancel out the frequencies from the front of the speaker. A subwoofer enclosure contains the frequencies at the back of the speaker to create uniformity in sound. Prevent Overheating. Most subwoofer boxes leave enough room around the speaker for air to flow in and out freely. That helps in cooling the subwoofer speakers to prevent overheating and damage to critical components, especially when you are playing loud music. Good aesthetics. Most manufacturers design subwoofers boxes with carpeted exteriors that match most vehicle interiors. The enclosed subwoofers make your car look classy, especially when placed in your trunk. Ported or vented boxes reinforce low bass response. They give a more forceful bass than sealed boxes, regardless of the amplifier wattage. Ported boxes also improve airflow to the subwoofers to prevent overheating especially when playing music for longer periods of time. They are suitable for playing heavy metal and similar types of music when driving.