OK, this may be a dumb question, but...... In ym Onkyo 575x Manual, in the Speaker Setup section, it tells you that a tone will be produced and that you can adjust the sound level of the test tone "to an appropriate level". What does that mean? Should I just be able to hear it? Should be be a comfortable listening level? Or should it be a bit loud? I have noticed that when using the 575x on movies that I often need to go up to about 80% for a good listening level. Thanks for any advice. Jeff Wilson P.S. I have a hearing problem and need the center channel as loud as possible...should I adjust the distance setting to make it further away?