Jeff there are many variables to take into account. However rug under the track no matter what the track is, is by far the quietest. A plus10 reading gives about a perceived doubling of volume to our human ears as I understand it. So if you have an average that is plus 5 higher than the other reading and also has a plus 5 higher on the high end of that reading it registers much louder to our ears. I run mostly postwar trains so they are loud to begin with, however to my old ears Super O on Homasote is quiet enough for me and honestly it looks great with or without ballast. Regards Rob W.
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