A Equalizer - adjusts frequencies to improve your system's sound; a processor uses digital signal processing for more comprehensive adjustments. A Crossover Network - directs the correct frequencies to the various amps, speakers, and subs in your system. A Line Drivers- boost voltage from your stereo's line outputs, so you get the most from your amps with less noise. A Bass Controller - The processors adjust the bass curve built into most factory radios, so you can get maximum performance from your amps and subs.
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