Originally Posted by neumei626
When I think about how the opposing drivers work, it is just hard for me to believe that there is no difference between opposing and same side woofer placement. I just think about the sound waves bouncing around the room, hitting each other and whatnot, screwing each other up. I imagine if the drivers were on the same side, all would be right with the direction the waves are going, since the waves emmited are hitting the same walls and starting in the same direction.
But imagining is all it is, because from talking to Chad and searching around the internet I know this to be false. After all a 20hz soundwave I believe is 54 feet long....
Still, I just can't help but to think it isn't quite as good somehow in some way, as same side driver placement.
Don't think of it as a directional thing. Think of it as a pressure thing. When the driver is moving outwards from the box, it's exerting positive pressure. When it's moving inwards, it's creating negative pressures. When both drivers are pushing out and moving inwards simultaneously, the output from each driver adds up. When they're moving in exactly opposite directions, they cancel out to varying degrees, depending on where you're observing them (aka, a dipole).
Alternating zones of positive and negative pressure moving at 1130 ft/second = sound, with the frequency equal to the number of complete alternations (or cycles) per second. The speed of sound will depend on altitude, temperature, and humidity, but 1130 is a decent approximation. You divide the speed of sound by the frequency to get the wavelength, so 20 Hz is ~56 ft long.
There will be a difference in the frequency response, but that has to do with the exact location of the drivers and how they interact with room modes.