can i listen to multiple things thru the same speakers?

[Shannon]

What happens is that when the waveforms meet, they neutralize one another to whatever degree they are in anti-phase, and magnify each other where they are in phase. This can actually be used to produce "audible silence", which is how noise canceling headphones work. They gather the sounds from outside the headphones and invert them, and then project the inverted form through the earphones to neutralize the external sounds. But you can still sense sound if you pay attention... you just can't hear it.

It's better to avoid doing this, although technically it can be done, because you're working with bery delicate audio in subliminals.