How do I connect the active and passive speakers together?

The HD3 includes a speaker wire with banana plugs on either end, so using them with the speakers should be a simple set up. The binding posts on the back of each speaker would need to be screwed down and the plugs would need to be inserted into the center hole (please refer to the picture for reference). You would need to make sure that each end matches with the color on the corresponding binding post; for example, if you inserted the red banana plug into the red binding post on one speaker, the same would follow suit for the other speaker. The spring style banana plugs provided with the HD3s may look like they won't fit, but they will actually compress to fit into the posts on the speakers, so some amount of effort will be needed to insert them.