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Re read the thread and some other related stuff to try to understand the concept presented here.
As for sound and pressure waves it is to produce a matching wave phased out by 1/2 a wavelength so that the two cancel each other out.
In order to do this the resonator needs to be reactive to the wave generator to reproduce this wave length, in the simplest terms the inside of the resonator needs to take on the low pressure fluctuations of the turbulent wake, does this not mean that the low pressure inside the resonator will be acting through the neck to the rear of the vehicle resulting in the same low pressure drag on the rear of the vehicle.
It may well smooth out some of the buffetting on the rear of the vehicle by transferring it into the resonator but this does not change the net low pressure at the rear of the vehicle in comparison to the high pressure at the front of the vehicle and it is this pressure differential that is the source of form drag isn't it?
There is also a possibility of increasing drag as with a diffuser that is too steep and just results in a greater surface area exposed to the low pressure wake, the resonator internal surface area may just add to the total surface area exposed to the low pressure wake.
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