I need to explain one more thing.
with 3 caps in series, in you charge them with 30v, you only get 10v each.
But if I charge it with a 90v battery, then I get 30v each.
So the more caps in series I want to put in the amplifier, I have to exceed the voltage, otherwise it doesn't work, yes.
But you can supply any amount of battery u want, its actually the charge in the "base capacitor" which is the precious passive commodity, which cant amp by itself.