Thank you all for the instant feedback. The mid-range speaker is indeed 6.5" measured from to the outer edges (beyond the screws). It just looks approximately like a Boston 5" speaker. At any rate, on your suggestions I unscrewed (use metric hex) and pulled it out a bit and to the side to make sure it was working. It was, although it may be blown for all I know. I then examined the 6.5" mid-range in both speakers and noted that the cone was detached from the center concave post "button", i.e., the cone moves back and forth along the center shaft. I've never seen an arrangement like this, but it seems right, since the center convex hard plastic button does not move in and out to the touch.
In sum, unless the mid-range is clearly damaged, I may just replace the tweeters and see if that improves the high end. Any suggestions where to get them? (I understand this is a grossly subjective judgment, but what I mean by high end is a certain bell-like clarity which may be an artifact of the Adcom/Boston combination.)
Lastly, by '80 speaker I had in mind the big Infinitys -- the kind of speaker Cream sounds just right on (as opposed to, say, The Clientele.)
In sum, unless the mid-range is clearly damaged, I may just replace the tweeters and see if that improves the high end. Any suggestions where to get them? (I understand this is a grossly subjective judgment, but what I mean by high end is a certain bell-like clarity which may be an artifact of the Adcom/Boston combination.)
Lastly, by '80 speaker I had in mind the big Infinitys -- the kind of speaker Cream sounds just right on (as opposed to, say, The Clientele.)