The difference between the 2

[Terranova 10+ year member]

Ok I was looking at the SPX series alpine components. What is the difference between the REF series and the PRO series? Is it worth paying double to get the PRO over the REF? The http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=18520

tied with a http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=17566

just in case i get rear door speakers someday. Would any of you recomend rear door speakers?

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[squeak9798 5,000+ posts]

What is the difference between the REF series and the PRO series?

Everything.

Different mids, different tweeters, different crossovers.

Is it worth paying double to get the PRO over the REF?

Depends on if you consider the difference in sound to be worth the difference in price.