I'm wondering if my tweeters are blown. I got rid of the amp I was powering them with and they are are running off h/u power for now until my new amp comes. They are CDT HD62 components. They sound fine and all but when you turn it up to a certain point, and there are words that have S's in them and such there is a weird "CHH" sound instead of a clear S sound. Does that mean they're blown? Or they're just turned up too high? There's no distortion when this happens, by the way. Thanks.