I've got an older Ibanez CT 5-string, which is a great sounding bass, but recently the j-type EMG pickups have started to make what I can best described as a "pinging" or a "ringing" type of sound when struck. Not the strings themselves, but the actual pickup will make this sound when it's hit. I've also noticed this problem to a lesser extent in my passive j-bass. I've unsuccessfully tried searching for a description of this problem, but it's such a unique sound, I'm not sure how others would describe it. Please let me know if this sounds at all familiar, and whether it may just be something loose, or if sounds like the whole pickup needs to be replaced.