Slat wall / slat resonator : calculating Q+corner wall depth

Hi there, After Stuart has pointed me to those (very useful) links : http://www.johnlsayers.com/HR/index1.htm http://www.sae.edu/reference_material/a ... encies.htm ... I understand the Heimholz principle behind those designs and would like to know - if the Q is calculable (not present in the Excel sheet) - what depth from the wall should be entered in the table in the case of a corner slat wall. Thanks!