Cello chose a very odd reference design for the Amati in the AR LST. I've never heard the Amati, but I did listen extensively to the LST back in the heyday of AR, KLH, EPI and Advent. Gee, what a dismal-sounding speaker. It wasn't just bad - it was really bad, a landmark of badness. Diffuse, blurry, veiled - how much more can one stand? The AR-3A, using fewer of the same drivers, sounded clearer, and even it was woefully out of date by the time the KLHs and Advents rolled along. I think the LST suffered from destructive interference from all those tweeters, being almost Bose-like at least in the forward hemisphere of radiation. That autotransformer may not have been very good either. That ML "designed" the crossover of the Amati hardly adds any hope that it might be better.