No head unit will put out 60 by 4 that is a max rating you always want to look at the true RMS rating. That is what a head unit is rely putting out to your speakers. So a normal head unit will put out around 15-22 watts RMS. No head units can not be bridged with there channels so that is not possible to do. In that case of not running any external head unit and all, I would look at a alpine CDA-105 it is a basic head unit that will do what you want. AGAIN you will NOT get 50-60 watts out of a head unit that is the max a number that you will never get to you always look at the RMS wattage.
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