Oh my goodness, that is correct.

The formula for active SPL at 3 feet for 1 Watt electrical power as a function of the number of actives then becomes:

SPL = 126 + 10*log(n)

Solving for n at 277dB, I get 1260E12. That is 1260 trillion actives. Each one needs 4.1 peak kW for a total of 5.2 quintillion Watts. That's one order of magnitude more than all the power produced last year.

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