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In no particular order and only my .02:
1.Titanium tweeters in the dash-to some they sound "harsh" but they cut through road noise quite well with top down
2. a powered sub box like Kicker, Alpine, etc.
3. A time delay (app, control on head unit, etc.) to increase soundstage and tune system to your tastes. Really made a difference for me-and it's a free Alpine app!
4. Amplify, amplify, amplify. Did I mention amplification?
It's amazing how good 12 volt electronics are these days and how not a lot of $$ gets a great system to where I'm not sure spending more buys more.
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