Sorry, but No. This is not right. The NFS will not just assume same result at any distance, this is the essence of the system, that when you move to different distance, you get NEW results. We can show that easily by showing you our 2m vertical contour plot and same contour plot at 66cm distance below:
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It is evident, that you see a difference between the two plots – especially in the LF region. The reason for this is because at nearfield, your relative distance from visualization point to the LF drivers is shorter. The circle below simple has the speaker physically shifted upwards to the left. Also – rear-driver contribution to SPL rearside will be unevenly high, due to relative distance to front-driver is shorter, due to nearfield evaluation.
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This explains why ‘nearfield’ contour plot see the increase in LF output at position above the speaker – the questionmarks in your figure. Our suggestion would be – moving forward – show contour plots in far-field, especially, when you are dealing with speakers that has some distance between the drivers.