You get a +6db bump when you add the additional same amp. +3db for the watt doublage, and another +3db for the doubled cone area. So you'd be kinda-sorta at 12 watts worth, whatever that means (too many variables to know).
As to how many watts you need, it all depends upon the venues, the music style, the efficiency of the hardware, the placement of the hardware, etc etc etc - I have been asked to turn down using 2.5 watts, but that may have been a critique of my playing . . . . . .
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-donh-
*everything* is a tone control
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