Power supply for audio amplifier

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Hi how can i project a Power supply like this
Symetrical 90V output Power 1000W

When you say symmetrical do you mean +/-45V or +/-90V ..?

For an audio amp you need 50% over-rating of current to meet music peaks, e.g. 15A peak each rail.

Do you need PFC on the input?

How about a big transformer with CT o/p, bridge rectifier and 2 x 47,000uF capacitors...?