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Pioneer’s GM-A6704 4-channel amplifier will greatly improve the sound quality in your vehicle and help enjoy your favorite tunes. This amplifier will power your front and rear speakers with 60 Watts RMS each amplifier will greatly improve the sound quality in your vehicle and help enjoy your favorite tunes. From dramatic distinction to dramatic design Pioneer’s new GM-Series amplifiers are thrillers in every sense pushing the limits of flexibility and functionality. The Variable HPF high pass filter allow for adjustable frequency from 40 Hz to 500 Hz* and greater car audio system flexibility according to subwoofer characteristics and personal listening preference.Pioneer amplifiers automatically select the proper input signal mode either RCA or speaker level. When the receiver is turned on the amplifier automatically turns on. When connected to an OEM receiver or a receiver without RCA output and utilizing speaker level output the amp automatically senses the input mode and powers up in sync with the receiver. When connected to an OEM receiver or a receiver without RCA output using speaker wire the amplifier is turned on at the same time as the receiver. Pioneer’s amplifiers automatically detect the input signal and select RCA level or speaker level. If your vehicle needs a sonic upgrade this amp’s performance features and reasonable price make it a great choice.