Cello was Mark Levinson's brand after he left ML, I don't remember them being connected with AR but a lot of products that are announced or even appear at shows that are never actually marketed.
Rickmac - The Cello Amati speaker was closely based on the AR LST speaker. Mark Levinson designed the crossover. It was considered high end with a suitably high price tag.
My bad, although I began in audio so long ago that my first speaker [mono] was an AR 2, now I think of AR as being Audio Research and not Acoustic Research.
AR=Acoustic Research ARC-Audio Research Corporation
At least, that's how they used to do it back in the 80's and 90's in the Sunday New York Times classified. That was before the internet and Audiogon and Audioreview.
Also, it the intervening years the status of Acoustic Research has descended to big box store marketing product.
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