Thanks for the post, and welcome to the community!
Bose speakers like that (the single cube or double cube speakers) were never intended to be used on their own, directly connected to a receiver. They were originally sold with an Acoustimass module (bass module) and the speakers were connected to that. From there, wired connections would be run to the receiver and sound could then be played.
In order to properly use these speakers, you would need the original bass module that came with them.