The KSW series has high level inputs, but not conventional high level outputs, so the he will need to run another set of speaker cables out of the high level input terminals. Or he could use the headphone output of the receiver to supply the subwoofer with a signal.

In any case it will work fine for a computer or modest bedroom system.
One cool idea is to get an alarm clock that has a CD player and headphone outputs and use a small stereo to connect to it for a nice alarm system.