Analysis of the simulation
Calculated results clearly shows the effect of the vented enclosure on the system response. In the case of sealed enclosure, the cut-off frequency at -3 dB is about 45 Hz and the slope is 12 dB / octave. For the vented enclosure, the cut-off frequency at -3 dB is about 25 Hz and the slope is 24 dB / octave.
In addition, some bursts occurring above 300 Hz are due to the eigen resonances of the box. The amplitude of these resonances is probably overestimated in the simulation.
