PIONEER RX2 - connection to sub and power speakers

Hello, I just got JBL 308 & LSR310s sub. I have an RX2, but I'm having trouble connecting the sub to the setup. I have plugs for the speakers and sub. Included are 2 XLR cables, a Livewire Advantage Angled/Straight Instrument Cable (POS #:112195623) & one other similar cable?

any ideas?