I acquired these speakers as an open item for a good deal. I did not recieve an owners manual, and the online pdf file didn't answer my question. The SF-3 has two sets of red-black inputs for wire in the back. I noticed that when I connected them to the lower set, the woofers worked, but the highs didn't. vice versa when i connected to the top set. I'm fairly daft when it comes to this home audio stuff. So baby steps would be good as to how to get "full" sound out of these speakers. thanks for any help.