I'm not sure what speakers you intend to use, but the subwoofer is designed to have a LFE input, or to take a pre-amplified stereo input, and pull off the low end, then pass on low level audio back to an amplifiier.
If you have any speakers you would like to use after the subwoofer, they will need to be amplified in some form or another.
Some Bose speakers plug into a bass module which includes amplification in the cheesy little plastic shell it comes in. It is almost entirely proprietary and will not allow connectivity in any other manner.
But, if you have stand alone Bose speakers, then they will still need some type of amplifier between the subwoofer shown and the speakers.