BTW - Your 6x9s WILL work fine right now! Just swap out the factory junk. The 150w is the maximum safe power they can handle and has nothing to do with normal volume levels. Odds are that they will be louder (and cleaner sounding) than the OEM speakers no matter what. Only if you hear distortion during loud passages will you 'need' more speaker power.
Also, once the sub is working you should be able to filter the lows out of the regular speakers which will allow the mids and highs to get louder still...
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