Power Acoustik BAMF 2500/5 2500-Watt 5-Channel Amplifier, Black The remote gain control allows amplifier level adjustment from a remote location in the vehicle. Sending a single signal from your head unit to multiple amplifiers in your system is easy using the pass-thru pre-amp outputs BAMF amplifiers use MOSFET transistors for the power supply & output stages. MOSFET transistors increase durability and longevity over bi-polar counterparts