A:AnswerYes you can. A couple of ways to do it depending on the subwoofers. The unit comes with 1 subwoofer that is not bad. I had another powered subwoofer meant to be run off the front speakers. I just used a banna clip splitter and hooked up the other subwoofer. Having both added a lot more sonics.
A:AnswerBirk unfortunately i believe that is no longer the case scents most new style systems have multiple hdmi ports that plug into existing gaming consoles ect so not really necessary.