you dont have to worry too much, if you build the hw right and put ok drivers in it , its going to give you what you want.i personally use an old jvc amp ($30 at a thrift store 50 wpc?) via a nice x over, and 2 old school jbl 15s', that amp combined with my h.w. fill a a big L shaped room, a big room probably 6 or 700 sq feet floor plan with enough bass to seriously upset my wife, because the outside of the house is vibrateing and disturbing the neibours! on 50 wpc???? just make sure you build the housewrecker 'to plans' and you will get the insane low end this cab is desighned to do

with 2 or 300 wrms, im a little afraid for you, you might be half way through a movie and some subsonic sound will be there, and it will litterally make you, and anyone else watching, jump out of your skin with fear! imagineing that a semi truck just crashed into your house, because thats what its going to sound, and feel like.