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alpine powerpack

  1. 2010-2013 Mazda 3 & Skyactiv Audio & Electronics
    Hi. I have a 2012 non Bose sedan. I upgraded the speakers to Polks in the back and Polk components in the front. They sound marginally better but not too much better than the stock speakers. To get better sound I bought an Alpine Power Pack KTP 445u mini amp to give the system some more power...