[Mondial]

My feeling is that they do work. The Philco patent filed for the clarifiers shows a bass response curve of the cabinet with and without the clarifiers. Without them there is a pronounced peak at the cabinet resonant frequency, while with them the peak is reduced by about 10 dB.

The clarifiers are actually tuned damping diaphragms, which absorb and dissipate energy at their self resonant frequencies.

Here is a link to the actual patent:

https://patentimages.storage.googleapis....059929.pdf