Devialet at Oxford Audio 13th July

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He also explained that the theoretical optimum mix (but practically unachievable) between A and D was 0% A and 100% D; but that the changes had moved them from 2%/98% to 0.5%/99.5%, improving precision by a factor of four.

Thanks, Ian, for the detailed report.  

What does the theoretical optimum mix of the A ratio of 0:100 mean?  Does that mean that the Pro series require less Class A output than before to produce the equivalent power output (when compared to the existing series)?

I am trying to understand the concept of precision having being improved by a factor of 4 as well

That had me thinking too.  I suppose the percentages refer to current delivery, and the "ideal" is that the class A delivers no current, just ensures that the output voltage is correct.  Which sounds all very nice, but unless the class A can provide /some/ current, how can it affect the voltage.  My interpretation is that the new control software means the class D can be more accurate so the class A has to deliver less current to correct for inaccuracies; thereby the class A can be more accurate itself and act more like an "ideal" voltage reference.

ETA: so (paradoxically?) because the class A is delivering less current, you're actually hearing a purer class A sound.