6.5's produce better sound then 6x9's so 6.5 with tweet components are gonna be ur best bet for sound quality no such thing is oval sound waves and all 6x9's are good for is lots of bass where as a 6.5 is more of mids and tweets for highs and subs for lows
does anyone actually like the way the stock 4x6 sounds? I hated mine. Especially since the 6 1/2 sounds 10 times better. That is why higher end manufacturers made a 4x6 plate with a 4" round and a tweeter.