I ahve a set of 10's I bought years ago. They are sounding strange lately and need some r and r. I think one of the tweeters is dead. Is there a post around or can someone tell me how to test them? I don't use them much any more but lately one of my 13 year old twins has gotten into listening to music. I need to replace the ancient reciever that I have had for years too. (It has scratches when you adjust the volume.) Any advise on trouble shooting the speaker problem woudl be great. I bought them new in the late 80's or early 90's and am really attached to them.