I'll answer questions 1 & 4:
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1. What is clipping the sound? I was under the impression that it meant turning down one wave frequency to almost zero while cranking the others.
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here is a basic explanation. Your audio is being cut of at the tops (and bottoms ) of the sound wave this will cause your speaker to try and stay at the extreme positions (at forward or back) and switch quickly.
More info at
http://www.prosoundweb.com/studyhall/studyjump.php?
pdf=clipping
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4. My system has a 1000 Watt Amp and two EV 300sx speakers. Are they too weak for the amp?
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I have been considering these speakers also. If you are talking about the EV sx300e their RMS power is 300W, this means you'll want to provide between 480W-750W per speaker. 600W would be the optimum. The basic calculation you can use is
RMS x 2 x 0.8 this is the minimum
RMS x 2 x 1,25 this is the maximum
http://www.prosoundweb.com/studyhall....php?pdf=watts
If you are running 1000W per speaker, that is a bit too much.
If you are overpowering your speakers and have these thumps and pops coming through without filtering that will surely blow out stuff. Your friend is right. If you are running clipped signal to speakers at that level (overpowering) it is likely something will blow.
Check the LAB archives at http:/www.live-audio.com/index.html for more info on sound stuff.
I can give you additional tips if you list your sound equipment.
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Timoteus Ruotsalainen