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i am looking at replacing the head unit, the rear speakers and the side speakers. i have found the ones that i want, but how do i tell if the head unit is powerful enough?
these are the side speakers i want (which have 75rms and 225 max) http://www.onlinecarstereo.com/CarAudio/p_19665_Infinity_Kappa_639i.aspx
the rear ones i want are these (which have 110rms and 330 max) http://www.onlinecarstereo.com/CarAudio/p_19664_Infinity_Kappa_6939i.aspx
this is the head unit i want (which has 22rms/50 peakx4 channels) http://www.onlinecarstereo.com/CarAudio/p_24156_Kenwood_KDC-BT645U.aspx
i have an 07 g6 gt
 

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i am looking at replacing the head unit, the rear speakers and the side speakers. i have found the ones that i want, but how do i tell if the head unit is powerful enough?
these are the side speakers i want (which have 75rms and 225 max) http://www.onlinecarstereo.com/CarAudio/p_19665_Infinity_Kappa_639i.aspx
the rear ones i want are these (which have 110rms and 330 max) http://www.onlinecarstereo.com/CarAudio/p_19664_Infinity_Kappa_6939i.aspx
this is the head unit i want (which has 22rms/50 peakx4 channels) http://www.onlinecarstereo.com/CarAudio/p_24156_Kenwood_KDC-BT645U.aspx
i have an 07 g6 gt
You might have a bit of a challenge mounting the front speakers since they need some room for the mid and tweeter.

As far as whether the head unit is loud enough, it depends on what you're after. I've had similar Kenwood head units (I had an Excelon in my Jeep and one of the 600-series in my previous SUV) and they are OK but don't expect thumping bass. In fact for any head unit if you want to feel it in your chest you will need to add an amp and subwoofer. But aside from that the head unit will provide more than adequate volume to leave your ears ringing from the upper bass, mids, and highs.

~ MattInSoCal
 

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For pretty much all after market speakers, i strongly suggest getting a 4 channel amp. The HU does not put out nearly enough power to power good after market speakers properly
 
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