I have had a great experience with everything alpine. As far as the signal processor goes i am not sure (ive never needed one because i have always replaced the stock headunit). Id go to a local audio shop that you trust and ask which signal processer they recommend and what they would want for installation/parts and such before heading down this path. It will get expensive quick. My last vehicle was a gti that i put alpine type x pro component speakers powered with the alpine digital amp ~100w rms x4 and a mono amp at 1000w rms powering 2 12" alpine type r subs wired to a 2 ohm load. It sounded awesome...needless to say I am not thrilled with the stock sound system but I dont have the cash to throw at the speakers yet.
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