I didn't say I'll tell you what they are if I do find out 😛But then we'll all want them.
I very, very much doubt itBut then we'll all want them.
Not sure about 'record', but I suspect some sort of active acoustic treatment device. Possibly it acts to cancel out some frequencies and elminate some room reflections.They are placed to the side of the speaker cabinet. Are they intended to record the sound to the side of it so that the effect of reflections from side walls can be predicted?