AudioSource SW Four Owner's Manual page 2

Line Level Connections
In this example, the Pre-Amp outputs of a stereo receiver are connected to the S W Four line inputs. The line outputs
on the S W Four return the line level signal to the Power Amp inputs on the stereo receiver, which in turn powers the Left
and Right speakers.
HI Level Connections
Here the signal is already amplified as it leaves the receiver/amplifier. The speaker terminals of this unit are
connected to the hi level inputs of the SW Four. The Left and Right speakers receive the original amplified signal from
the SW Four hi level outputs.