In response to RickSean's last post, I've confirmed that the M80s have no problem producing respectable SPLs with a quarter watt and less right down to 40Hz. See the chart below. The background to the measurements for power is shown here.

RickSean, the arguments therefore that you have posited are null and void. I also want to point out that capacitors don't require any "powering up" as they are passive components. And from what I've witnessed out of my low-cost receiver, Denon is to be commended for their engineering prowess.

So, we are now back to square one.