It's always something with me isn't it?!

Alright let me attempt to explain what is happening with my system and hopefully someone will be able to troubleshoot and tell me what is wrong so I can get it fixed.
To give a little history about what's going on... for a few weeks hit and miss the sound would drop out and become muffled. Not to mention it sounded horrible and people let me know it did too. I was told it was the mixer board so I replaced that with a brand spankin' new mixer... that wasn't the problem. As it ended up my amp up and died so that was replaced (with the crate1400 mentioned in my post). Last week the sound seemed to drop out a couple of times but I really thought it might just have been my imagination running away with me.
Wrong answer! Last night it was horrible and was probably muffled more than it was clear. Gosh I could smack myself because I think my lack of knowledge is what caused the amp to kill over and... what I am wondering about the sound now is that the speakers have been damaged. At least the highs and mids. Thus being why the sound is muffled. The signal stays the same.
I know that in my previous question that the Pyle speakers seemed to be low end... which I kinda figured because of the price but they fit my budget at the time. Of course I've not ruled out it being the EQ since the sound is what is going bad. What do you all think it might be? Also should it end up being the speakers I would probably be putting Peaveys in their place. Would that be a good choice of speakers?
Thank you all and by the way, Happy New Year!!