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.
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