I have been hearing a sort of rattling noise from one of my speakers for a while now, usually when listening to piano music at the start of and during a crescendo. It is audible, but not very loud, so that it takes a while to admit to one's self that there is something actually wrong. Researching the issue I came across a thread on A'gon dating back a few years where I realized that this is a known issue. By listening carefully I think that I have narrowed down the problem to the 3.5 inch mid driver. Well it appears that replacements are no longer available, here in Canada, or in the US for that matter. Since these are CMMD drivers, an Infinity proprietary technology, there are obviously no other sources of anything that could properly replace this driver. What would you guys do in such a situation? Double down and buy more used towers hoping that the mid will be ok and cannibalize them? Learn to love the noise and hope it doesn't get worse? Get in touch with Infinity distributors world-wide to see if anyone has them and are willing to send them out of their own market? Is there anyone out here who can repair these drivers? Any information and suggestions would be greatly appreciated as now being retired the financial resources are not what they used to be. Thanks. Pat.