2012 mazda3 import which would be better to upgrade first?

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Mazda 3 i sport 2012
2012 isport which would be better to upgrade first?

I can't listen to music loudly without distortion either on the high or low end, this is through aux. Should I be looking for a new head unit or speakers first. I'd rather do speakers because I can't find any head units that don't look super tacky.
 
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