The regulation circuits on power-supplies (of reasonable quality) already have trim pots on all the positive outputs. All you need to do is tune them until the tolerance is matched, tie the + leads together and call it a day.
And yes, 300W+300W = 600W because you have to look at the definition of W. Watts are equal to Volts*Amps. To calculate wattage, you do this for every output and add em together.
Im back from the dead (braincells)
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MeltMan
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