To let you know where I'm coming from, a few years ago I owned a pair of Thiel CS-1.5s that were driven by Rotel RB-981 and Acurus A-200 at various times. I also used a pair of RB-981s bridged to mono. My impression was the Acurus may be the most uncolored/accurate amp I've owned. This could come across as sterile but plenty powerful. The Rotels were much warmer sounding, and that was a good thing with the Thiels as I found them to be analytical to the max. As Ive never heard the 1.6s, this should be taken for what it's worth but I preferred the Rotel amps with the 1.5s.
I also owned an A-250 but not with the Thiels. The $499 price seems a bit high for the A-250 or else I sold mine way too cheap.
I also owned an A-250 but not with the Thiels. The $499 price seems a bit high for the A-250 or else I sold mine way too cheap.