Don’t let poor-quality music hamper your long drive. Instead pump up your speaker system by installing this Blaupunkt amplifier. This class-AB amplifier is designed to enhance your in-car listening experience by adding that extra bass, treble and punch to the music. Powerful Performance This GTA 470SF series 4-channel amplifier can pump out a maximum power of 840W, meaning you can enjoy high-quality music even at high volumes. The high octave output when coupled with the wide frequency range, makes this MOS-FET-powered amplifier a truly versatile piece of technology.