I've been experimenting with different shapes and size baffles. Slanting is another option of changing the response of the dipole baffle. Below are two examples of how slanting does affect the frequency/magnitude curve of the dipole. You will also notice the large differences in the low behaviour of a seemingly same size baffle. This is the subject of a study I'm performing in an attempt to understand the full impact of dipole reinforcement and mechanical ways to alleviate the "problem". All plots below were performed using a passive cavity resonance notch filter. A 1 meter reference plot is in the picture for personal reference purposes.
The green trace is the reference trace for archival purposes.
Notice the shape of the dipole reinforcement bump for this
particular shape of baffle. (More info on this subject to follow
later.)
The yellow trace was taken with the baffle upright and floorstanding, RD-75
four inches above floor level. Throw distance was 3 meter.
The white trace is the same baffle, the top slanted 6 inches backwards. It
may not seem much, but this is again one of those instances where if proved
to be very audible. The flatter response at 1 kHz is very noticeable.
The plot below has only two traces. Red, similar baffle with a twist (patience ;-), upright, no slant, same throw distance to the microphone. There are major differences with the yellow trace from the above plot. Observe what is happening in the 100-600 Hz area. More about this later. The white trace is the same baffle, same twist, top slanted 6 inches backwards. There was again an audible difference, even on the MLS noise of the LAUD system.
All measurements were 16k MLS with a 4096 point FFT on a 85.3 millisecond measurements interval, in room response.