Thanks guys.
I looked at the manual yesterday but couldn't find what I was looking for. John, thanks for taking the time to look at the manual, I'll have a better look at this section tonight when I get home.
I am not doubting the capacity of Audyssey to adjust the right levels, I am more interested in playing with the SPL meter and understand how people used to calibrate their system manually.

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."