Mini Subwoofer How Can I Connect A Subwoofer And A Power Amp On MBOX Mini 2? ?

How can I connect a subwoofer and a power amp on MBOX Mini 2? ? - mini subwoofer

I have connected a Pro Tools Mbox 2 Mini, Mackie MR8s, to the USB port, now how can I add a subwoofer and an amplifier power for this configuration?