Quote:
PeteD wrote:
 Regarding number 1, please look at the graphs below. These show filtered response from 10 to 200 Hz on the same scale. I generated the LF waterfall from the frequency response. Why do the SPL in waterfall look higher? |
Because you are not allowing for the perspective of the waterfall plot. The SPL axis markings on the LHS of the graph are for the frontmost slice of the waterfall, if you look at the lines on the back wall of the waterfall you can see the 96 and 88dB lines and the rearmost slice lines up between them as it should. You can also use the slice slider to move the rearmost slice to the front to more easily see the actual levels, or change the perspective settings via the "More waterfall controls..." panel.
Quote:
PeteD wrote:
Below what frequency are you less worried about resonance? |
I don't understand that question. Modal resonances are most significant at low frequencies, below about 200Hz. At higher frequencies they are still present but there are so many their individual effects are no longer easily resolved and dealing with them requires room treatment.