Whole house speakers and macbook [View all]

Bought a house with whole house speakers. There is a wall panel in the master suite that has two (2) red and black inputs --the kind you find on old stereos where the wires attached to speakers were inserted.
Most of my music is on digital devices ....
Is functionality as simple as running open ended black and red speaker wires from a stereo, setting to aux, and then running a 3.5 mm wire from the iPhone or macbook ?

Why would there be two red/black wall inputs ? I figured many of you are more clever than me on this one ....