HP 75 - Manual (Page 15)

Setting Up the Monitor
User Guide 3–5
3. Attach the green connector from the control speaker to the
green port on the back of the computer.
4. Attach the speaker power adapter cable to the connector on
the back of the control speaker, and then plug the AC adapter
into an electrical outlet.
5. Use the control knob A to turn on the speakers and adjust
volume.
6. If you are using a subwoofer, insert the subwoofer audio plug
into the speaker’s subwoofer connector B .
7. As needed, connect headphones to the headphone jack
connector (not shown) on the right control speaker.