Thanks for sharing your speaker upgrade experience. I have a 2012 Mazda 3 Sport (GS Sky). I think the speakers should be the same as the 2011s. Can it accept the ones you linked (Infinity Reference 6" x 8" / 5" x 7")? The speaker grills look circular to me. I thought it only accepts 6x6. In my old car (civic), I used to have Infinity speakers at the front. The Mazda 3 stock ones have more powerful bass. But the mid and high bass is not clear.

So Alpines are better? Any specific model you can recommend? I am planning to only changing the 4 speakers and keeping everything else stock.

One more question regarding the 2 stock tweeters at the front doors: after upgrading the speakers, do the tweeters generally be disconnected? Or do they stay as connected? Thanks!