Acoustic Zen Crescendo

Bill,
The 48 watt LM 508ia is less expensive than the 22 watt LM 219ia
The 508ia could possibly be a better match with the Cresendo given the increased power.  My suspicion is both of these LM amplifiers would sound exceptionally good. 
Charles 

Bill,
I get your point regarding the Triode Corp TRX 845 PSET mono blocks,  they are huge and heavy as well as expensive (which is relative). The Triode/Cresendo pairing sounds better than so many amplifier/speaker combinations at the shows that are far more expensive. At CES  3 years consecutively the Triode/Cresendo was among the very best sounding systems regardless of cost that I heard.
Charles 

The LM518 is a 22 watt 845 amp for around $5000.  That was the one I thought Wig had. His 508 is an 805 tube based amp that shows an $18,000 price. Nice amp for sure and most likely enough power for me, but the cost 😢 

granny sksos1 could answer best but I suspect zeros might add value if tried with Atmasphere OTL running Crescendos having impedance as described.

Atmasphere seems to lean towards 16 ohm speakers as being better.   Given that 6 ohm nominal load may perform reasonably well perhaps (or not) but there is room for improvement in terms of ratio of input/output imedance which determines performance (up to a point).   Zeros would provide that  if needed.

Bill,
The price of the LM  508ia in the 5000 to 5500.00 USD range.  18,00.00 is incorrect. 
Charles