Hello! My JBL powered speakers [prx515 and prx518] are making nasty noises. They emit a very high frequency when powered on. I would say above 14kHz. The tone is a steady volume until I run a signal to the speakers, and when that happens that particular frequency is amplified as well. I'm stuck on what it could be. I've tried to reset the breaker that they are on, as that solved the problem once before, but only for a short time. I should mention that these speakers are flown... Now I think that isn't even near enough info to assess the situation...but let me know what more info you would like and I would gladly tell you, this frequency is bugging me!