Calculating speaker wattage

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Hello, is there a formula by which you can calculate the loudspeaker wattage required when building a system? For example what kickbass wattage and db level should I choose If I have a 270w sub 95db/1m?

forexample a formula by which it would be possible to calculate 30hz-300w 95db sub and 120 hz- ?? - 98db kickbass

Thanks
A
 
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