and if you notice on the BX line of amps...
there are two speakers outputs..
+ + - -
whereas most amps with two CHANNELs are like this
+ - + -
That is because in the hifonics, they just give you two "outputs", but it's just the same as
+ -
Because they just join together anyhow. It's a convenience thing, that has confused many a BBY installers... (what? yes it's two channel, but wait, it says mono, wtf?).