05-28-2014, 03:51 AM
The speakers can't be hurt electrically unless you feed them clipping high frequency signals. Sunlight and ozone attacking the cones/surrounds are the main things to worry about. Next, way, way down the probability, is the crossover capacitors failing if they are electrolytics or some other type of caps that might short out. Some speaker magnets might lose strength, but that typically only happens with cheap speakers when run hot for a really long time.