Arg, you guys are killing me!
Someone please look at the link in post #9 that way we can progress on this thread,...PLEASE!
Forgive my impatience gentlemen, but it is like you are just reading the OP and answering the question without research.
Most amplifiers, unlike the Emotiva BPA-1 have fixed inputs that when paired with fixed outputs from sources such as a DVD player or CD player would result in catastrophic damage to your speakers or amplifier. But in the special case of this BPA-1, it has volume control. The amp can be used as a stereo integrated amplifier with no tonal controls or switching abilities, or you can bridge the amp and use it to power one speaker, or you can use it as a complete subwoofer amplifier (it has a selectable, variable low pass x-over) and also can be daisy chained to other amplifiers using the output.