Thats very interesting advice. Can you provide a link to the tones?

Also as to getting to 75db- with digital speakers, the highest level setting you can achieve is 0. In my room, with all speakers set to 0, the rear right comes in at 71db, while the others come in higher- so I have to bring the others down to 71.

Best regards,
Jerry
Main System: 861v6, DSP8000s in corners, DSP7000s Center and Sides, 1-9 humans.