Need High level, high pass crossover for 250watts

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How would i go about making a high level, high pass crossover, that cuts in at 100-150hz, for 250watts, 8ohm speaker.

My understanding is i will need a non-polerised cap for a high pass filter. will 100v suffice for 250watts ? what value of capitance will i need for 120hz ?

Thanks
 
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