I could be wrong, but I think larger ADAs have a lower noise figure because the noise figure is referenced to full power. If it was referenced to 1 Watt, you could compare one model with another. Referenced to full power, I'd have to do some math to compare. Unfortunately I haven't had coffee yet today. I have a rule that says no math, physics or chemistry before coffee.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated