Instead of Surround, Why Not Top, Medium, & Bottom Heights?

[Nanometer]

While the x.2 is a complete waste.... Since human cannot locate low frequency tones, there is no point in multiple subwoofers.

Two subwoofers have nothing to do with being able to locate the sound.. The actual purpose of multiple subs is to even the room response at multiple position as well as for a singular position. Professional theaters use several subs as well, and I can assure to you that they did not do it just because, they did it for getting the proper sound. In a nice home theater, or professional theater it is very common to find 2 subwoofers, and sometimes 4 depending on the requirements and on the types of speakers being used. Do a simple google and you will find the benefits of multiple subwoofers. There are many reputable sites that have nice comparisons of the benefits of multiple speaker arrays.

Klipsch and JBL which are used almost exclusively in major retail theater companies like MANN, AMC, Muvico, etc, all use a 2 or 4 subwoofer arrays in their large theaters.

There is 2.0 sound systems all the way to 12.2 and getting processors to control this kind of sound arrays gets exponentially expensive as well. for 300 dollars you can barely get a decent 5.1 processor/receiver. Theater equipment gets expensive when you want expensive features like 10.2 surround!

I gotta say though, if your full range speakers are that good, and plenty are, the need for normal sub starts to dwindle. But nothing can replace the power of a good sub that can hit in the 30-16 hz range. Towers that reach that low are few and far between, and quite often obscenely expensive. Check out Definitive's flagship Bipolar speakers to get an idea of what "crazy" full range speakers can do.