I guess I just like to play it safe, even if that means I am being overly safe. Some recordings are mixed like absolute garbage these days. When I get the oscope back out to test the eq bands on my headunit (talked about it in another thread) ill probably set again using a -5db, and then take note at what volume a 0db doesn't clip. That way I know I can use between X and Y depending on quality of recording/file. The argument for using -5db tones definitely makes sense. Hell the argument for using -10db tones makes sense. When you record an album your supposed to do it at -10db and when you record/transmit for broadcast -15db (I even double checked this with my brother who is taking a lot of recording classes in college right now to see if it had changed), but like I said, lots of shit recordings that don't follow these rules. Read up on the loudness war if you haven't already.