Friday morning we repeated the same acoustic injections in CEB that we did on August 24 (same location of loudespeakes at the North terrace).

Hrec peaks got excited in the region between 400Hz and 550Hz, which is more or less the frequency region affected when injectiong on August 24. Figure 1 shows Hrec during the injection yesterday, while Figure 2 shows the same for Aug 24. The peaks that excite now have slightly different frequency: (Hz) 392, 420, 422, 432, 437, 479Hz (on Aug 24 they were: 342,418,523,543Hz)

Figure 3 shows the measured transfer fuction between Hrec and the CEB hall microphone, comparing now and Aug 24: there is not much difference, except for a larger coupling at the new peaks 432Hz and 437Hz.

Figure 4 shows the projection of CEB microphone quiet noise onto hrec, which can be compared to this Figure for Aug 24.

Also attached is the csv file with the measured TF.