Ribbon midrange pros and cons

Correct, Raal tweeters are fantastic and the sound coming out is also dependant on the overall speaker design. Just cannot say all ribbons sound bad as a blanket statement. Just not true. Robert of Acoustic Zen incorporates a ribbon in his Crescendo speakers that sound wonderful. Again, the complete design is key! Tonian Labs also uses ribbons and they are some of the most musical speakers I have listened to. 

Thank you guys for all the responses. .those explanations were on the same lines as l was thinking ...l was particularly thinking of the infinity Beta ,the Epsilon and the new speakers PS Audio is working on...Paul says hes working on a 120 db. Ribbon midrange .l just dont see other manufacturers using these types of midranges and wondering why.l an going to Expona this weekend in Chicago to listen to some great systems. ..lm sure to be impressed. ...

Adam Audio has ribbon mids . Don't know if its a pro or con . I own the Tensor Gamma version . It is probably the closest in sound to my King Sound King electrotat speaker I have come across in detail , speed and tone .

PS Audio was working on an AMT midrange, but was unhappy with the sound. At AXPONA, they will be using a Bohlender Graebener Neo10 planer magnetic driver.

There is a lot of inaccuracy bandied about when talking about ribbon transducers. A ribbon is a piece of very thin corrugated foil suspended in a magnetic field. They are not planar magnetic drivers (the AMT is a folded planar magnetic driver, and the Infinity EMITs and EMIMs were planar magnetics). And although 1930s era ribbon microphones did require matching transformers, modern ribbon drivers, i.e. as used in Apogee speakers, have a long enough ribbon that their DC resistance is near 4 ohms and does not require a transformer. I’m uncertain what Magnepan uses, but my guess is long, thin, planar magnetic drivers. (Though the new LRS may use ribbons - but if the conductor is bonded to a membrane, it isn’t a ribbon).