I'm no expert at this by a long shot but from the info I was given you set your amp to '0' which should be either 75db or 85db. What you then look for is a level on each speaker of 75db.
If you don't listen at that level then you would have your amp at say -20 but the speaker levels would all be the same.
Logically I would guess if you had your amp at -10db then youwould look for a level of 65db, cause the test tones are quite loud at 0.
Some members advocate setting the levels with one of 2 DVD setup discs which cost around £12-20 with more realistic test tones. I did the amp test tones first, noted the levels and then did the DVD and the difference on mine was minor but slightly more balanced as far as I could ascertain.
Hope that helps, some more knowledgable than me will probably update us all.
Steve