I guess this shootout really shows the performance of the db K300 and FBT J5a speakers.

Directly compared with the Nano 300 near maximum volume, Nano 300 set to a decent subwoofer level of 25% but cranked up to the point where the green display turns orange at each drum kick. (The orange light would come up at much lower levels if the sub were turned up higher).
So it's a very fair comparison, each system is turned up to its maximum usable level.