Prolonged continuous operation of an amplifier, speaker, or subwoofer in a distorted, clipped or over-powered manner can cause your audio system to overheat, possibly catching fire and resulting in serious damage to your components and/or vehicle. Amplifiers require up to 4 inches (10cm) open ventilation. Subwoofers should be mounted with at least 1 inch (2.5cm) clearance between the front of the speaker and any surface.