cx7 speaker specs?

can someone tell me how many watts RMS the stock CX7 head unit puts out (4 speaker/non-bose). i'm looking at some double din head units and it seems Kenwood decks provide the most RMS, some at 22-24 watts. i'm trying to judge whether or not to buy a 4 channel amp. thanks.

btw: i purchased Polk components and they're reccommmended between 6-60 watts RMS. so hopefully 22 will be decent enough.
 
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