I did study electronics decades ago, but unless someone goes over things with me, it's all rust in the memory. I've been looking at DIY Amp kits. My question: If an amp is 60 watts rated, would 2 30 watter or 4 15 watt speakers be adequate. IOW, are the directly proporational as far as ratings? If a speaker blew, of a set of 4 @ 15 watts rating, would the others blow too given added flow through them on a 60 watt amp? Is there a way to limit this?