wout31
500+ Head-Fier
There is that oh so popular word again "speed".Agreed, and it's important that the speed of the subwoofer be in the same league as the main speakers, and the crossover point and slopes are critical too. And the placement of the sub is super critical. With two subs placement becomes less critical.
A speaker designer can spend a lot of time to get at least some coherency in the set of drivers and filters in 1 box speaker. It takes lots of knowledge, software, hardware and time to build a decent speaker. None of these drivers have the same "speed" as mass varies, as does coil, airgap, material, design, construction etc etc.
Now we place a sub and add a whole new dimension to the equasion.
It is just part of the loudness war.