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You're making a bigger mistake

Whether you get the calculating part figured out or not, you are aiming for the wrong target. Due to phase shifts, the corner frequency, which is actually the point at which the signal is already attenuated by 3db, should be at least ten times lower than the lowest frequency you want to accurately pass. Why do you think the manufacturer used a 330uf if a much smaller cap would have been adequate? Do you think the people who design amplifiers, yours specifically, are stupid? If you expect your amp to pass 20hz without significant distortion, shoot for 2hz or an even lower corner.

Get tweaking, but do it right.

Peace,
Tom E
berate is 8 and benign is 9

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