I must be electonically challenged, big time. I've asked this before but either forgot, or simply didn't understand the answers I got, so I'm going to aske again. Please explain how the ohms thing works, what you can and what you can't do regarding them, and explain as though you were telling a first grader. If an amp says its 4 ohms per channel what speakers is it safe to connect? Why? What if it says use only 8 ohm or below (above?) per channel???? Is it safe to go higher in ohmage (is that a word) or lower???? What causes a head to burn out as our PA head did last year????? Please offer as much info as possible and I'd appreciate a control on the sarcasm. Last time some people got a little snippy at my lack of understanding. No snippy dammit! I don't like snippy. Please tell all you can now regarding ohms so I can get this down once and for all and be able to plug our PA head into club speakers without any fear or worry. Thanks.