Alpine R2-A60F Amplifier 4 Channel Class D Stereo Speaker Power Car Amp 600w RMSAlpine R Series Amps: Born to be Played Loud R Series 4 channel Power Amplifier RMS Power Ratings 4 x 150W @ 2 Ohms R2 A60F The R Series line of speakers, subwoofers and amplifiers have a heritage of sound quality you can hear from a block away, and the newly added R Series amplifiers are no exception. Aside from their best in class performance, these amplifiers are tuned to emphasize the characteristics of the R Series speakers and subwoofers, giving