I'm in the process of moving and when I get settled in. I'm going to upgrade from an all-in-one HTS to a more powerful system. I'm researching and trying to understand what 6.1 and 7.1 is. I'm thinking of going with either a Denon or Onkyo receiver and notice that a few of the one's I have in mind have 6.1 and 7.1 built in. Do these receivers use 6 and 7 speakers plus a sub or does this mean something else? I'm just trying to figure out how one would set up 6 or 7 speakers. I have another question while on topic of receivers. I want to get the Denon 1600 dvd player. My question is would I be better off getting the Denon receiver or does it matter about having a Denon player and a Onkyo receiver. Thanks and I hope someone can help me with these questions.