Surround speakers

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Surround speakers (Please!!!)

Hi everybody!!
I'm following this forum quait a long time now (among every other source I can find on the Internet) and since I am ready to start my first DIY projects I have some newbie questions to ask. Speakers will be used for home theather like surround speakers and the speakers units I bought are four MONACOR SPH-135AD midwoofers(tweeters haven't bought yet) with T/S: http://www.monacor.com/produkte/Produkte/Details.cfm?aID=3295&UG=270064309
I want to make sealed tower speakers in D'Appolito configuration so here are the questions:
1. Is this can be done(sealed)
2. Is this type of crossover fit my needs(also for center chanel) http://www.lcaudio.com/dele.htm ( 2,5way)
3. If Home Theater receiver has already filtered subwoofer output do I need another active filter or just power amplifier and is this output can be used to make stereo subwoofers


Thanks in advance!(if anybodu care to answer):(
 
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