Compact Rockford Fosgate Power BR and AD amplifiers generate a lot of wattage in a compact chassis. A natural by-product of generating this power is heat. To get rid of this heat, Rockford Fosgate engineers developed an efficient method to keep the amplifier running cool. This is accomplished by using a 3-stage thermal lock extrusion. It uses "dual fan forced induction" to pull in fresh air. It pulls heat off the MOSFETS and directs airflow into the exhaust channel. Then finally drives this heat out of the amplifier. Furthermore, the top heat sink is decoupled from the bottom, so the top remains cooler to the touch. SUMMARY When installing the amplifier, it's best to allow 2 to 3 inches minimum clearance around the fan intake and exhaust vents to optimize air-flow. As you can see, this method developed by Rockford Fosgate engineers, effectively exhausts heat and ensures your amplifier runs cooler for optimum performance. ">3-stage airflow method effectively exhausts heat and ensures your amplifier runs cooler for optimum performance.