Watts are the amount of power that can be delivered, capacitance the amount of current stored for immediate delivery. It is possible to add outboard cap banks IF you know what you are doing, possible to generate an interesting epitaph if you don't. If you have an amp that really delivers 900 watts into 4 ohms and has 60K of capacitance you should have enough, but specs don't always tell the whole story on sound quality. Current storage is far less important for Class D amps and similar which can draw current very quickly. A complicated question with no simple answer; remember again specs aren't sound quality. Some think very large storage is critical, others think small caps give a more agile sound, Classe use to take this route, may still.
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