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DSP can do a lot for how an audio system sounds. i used to install corporate board room AV systems and DSP programming for the more advanced multi-mic array systems can be daunting, but can make or break the entire system. If you are going to keep your head unit, DSP is the only way to make a genuine improvement. I have not used standalone car audio DSP, but I have used home receivers and car audio head units that employ the most important DSP processing elements, which are time alignment, self baseline EQ via calibrated microphone, user EQ, and user crossovers for each driver. Unless you're going with a high end audiophile head unit that has these features built-in, a standalone DSP should get it done.
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