Its not a matter of belief. Its a matter of physics.
The more sub locations the more bass modes and the smoother the bass response.
The more subs the less volume each one has to put out and so again the smaller the modes and the smoother the bass response.
This is all due to the fact low frequency waves are very long. None of this changes when the room gets smaller.
The problem is people don't understand what's going on. They buy a sub to hear low bass. So they turn it up enough to hear low bass. This excites room modes making boomy bass. They conclude its the room. Or the sub. Or anything but what it is, the universal physics of long waves in small rooms. The solution is many small subs.
Its not that 2 or 4 is best. Its that more is better.
