How powerful the subwoofer should be?

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Hi all,
I am about to construct a 2+1 amp system for home use. how powerful the sub should be than the other amps? I mean the amps are 100W each, how much power the sub should have? somebody please shed some light into this matter. Also, should the woofer be more powerful on a triamped or biamped system? thanks.
 
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