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Lref is given directly by the user, or calculated based on reference measurements specified by the user.
If user specified reference level is used, open a new dialog
by clicking the 
button. In
this dialog Lref can be specified directly or calculated from
reference measurements, all assuming calculation in octave bands.
Direct specification of Lref is done in dB. This is useful in the case where the source and measurement equipment has been pre-measured in an anechoic room or otherwise, the reference level calculated, and the actual room measurement performed with exactly the same equipment and level settings. Alternatively known level changes can be used and corrected for. The calculation procedure described in the following subsection can be used to find reference levels for later use.
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