Quote Originally Posted by JoeE SP9
When you connect capacitors in parallel the voltage rating is increased. Two 10 micro farad 50volt rated caps wired in parallel will total 20 micro farad's capacitance and have a 100volt rating. When wired in series the voltage rating is whatever it is for the device with the lowest voltage rating (capacitor) but the capacitance is calculated the same way parallel resistance is.
Thanks, Joe. I understand this better now, especially the voltage aspect.

I think I've notice a trend in amplifier design to multiple power supply capacitors; as I recall the reason offered was that multiple capacitors unload faster singles for the same total capacitance -- I don't whether I got that right or whether it applies to crossover caps too.