My speakers make a scratching, or sort of fuzzy sound whenever the sound of a trumpet fizzles out, for example in Miles Davis' song "So What," the tweeter will have some distortion, or fuzzy/scratching, even shaking noise when Davis finishes off some of his notes. This only happens at higher, but often reasonable listening volumes. It only occurs at certain frequencies. How do I fix this? One thing to note is that I am using a 27watt receiver, and my speaker was designed for 100watts. Should I stop using this receiver? I have one coming in the mail for 120w.