K8060 use as a subwoofer

Velleman illustrated manual says K8060 can be used as a subwoofer amplifier.I hope to use this as a subwoofer amplifier.

I have a Sony Aluminium tube subwoofer (dual speaker 2 ohms 180 watts RMS-2 watts combined impedance.I think two 4 ohms speakers wired parallel.Inside I cannot see it is sealed )which needs to be connected.

If it is possible what steps to be taken?