Pioneer GM-6500F 4-Channel Bridgeable Amplifier Amplifiers send a cleaner current to your car speakers. It means that stereo gets cleaner sound & frequency,ensuring a higher sound quality overall. The 4-channel GM-6500F delivers a whopping 760 watts max (60 watts x 4 at 4ohms or 85 watts x 4 at 2 ohms; 180 watts x 2 at 4 ohms) GM-6500F's speaker level inputs allow to connect your OEM unit (or any unit with no typical RCA-type inputs) without having to buy add-on adapters.