I've got 5 Ascend CBM-170's without a sub. I see that the Ascend manual suggests at least 6" of space behind the speaker for the rear port. My room is so small that I have to place my rear surrounds right next to the wall. Should I set these speakers as small because they don't get 6"? They are both in corners where they aren't flush with the wall. I'd say they might have as much room as if they were on those wall mount stands. I'd like to keep all of them full range for now because I don't have a sub yet. I'm new to this so I don't know if it's wrong to do it this way.