Yes, the stereo amplifier speaker outputs connect to the "high level inputs" on the Dick Smith powered subwoofer and satellite speakers connect to the "satellite outputs" on the Dick Smith powered subwoofer.
The Kenwood speaker is wide but not tall so it might be a "center channel" speaker that you cannot use with the Dick Smith thing. It looks like Kenwood does not make, sell or support their home entertainment products anymore, they do only car radio products now.
The satellite speakers should not be tiny, they should have at least a 6.5" size woofer and a tweeter.