sounds simular to some ideas i was thinking about, i was thinking of having somtype of cool down failsafe. mabey having a failsafe light to turn on (incase i cant tell the diffrence that a singal driver has gone out while the rest are fine). i remember a freind of mine has these older house hold speakers. my guess is thier about 100-150watt each and running at 8ohm. not exactly sure what brand it is, but its got these small cast iron labals with the letters "RTR" on them. when my freinds dad had gotten them, he had spent over $1,500 during the time they were sold. and on the back of these "RTR"s they had a small failsafe on them, where if overpowered, a push pin would pop in the back and the speaker would cut off. thats somthing like i was thinking about. any thoughts?