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The Hole on the orginal speaker box is not for fun, it related to tuning freq. of the box :)
General rule of thumb is 1.5 times the RMS wattage of the Speakers you are using. Usually 2.0 or 2.5 times for subs. Otherwise you're going to have Amplifier clipping problems.
http://en.wikipedia.org/wiki/Clipping_(audio)
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/clipping/page1.html