I have the B$W DM7 Mark 2 speakers that were made in 1979 and cost $1,500 then new. They have the exposed tweeter on top and the yellow kevlar midrange. They still sound great!
I don't know if B&W were the first to do this, but it has been a consistent design attribute on some of their models since the late 1970's. The 801's had this and they were available in at least 1978, maybe earlier. I can't recall. Sean >
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