The old Heil AMT1 speakers had ribbon drivers in a semi-horn bidirectional enclosure that were pretty awesome sounding in the ribbons range, which reached down into the midrange.
Ribbon midrange pros and cons
Ribbon tweeters are fairly common on some high end speakers. ...they sound great.....can anyone tell me why ribbon midranges are hardly ever used by some of the best speaker companies. ..what are the pros and cons?