I hear the cymbals quite clearly on my advents. The electrolytics probably need replacing. If you get the tweeter at ear level that helps. For a larger room you can get a second pair and stack them tweeter to tweeter which seems to bring out the midrange a bit. It also depends on if you run them with the switch in extended position. The late model 80's advents (5002) used soft domes. You could pick up a pair on fleabay and try them but I bet changing caps will satisfy ya.
Good luck
Good luck