Hi,
When doing some measurements my measurement rig shows that the newer JBL drivers do have the same inverted polarity as the old ones, albeit I interpret the document otherwise.
I.e. applying positive voltage to the negative connector (colored Black or marked "minus") will course the diaphragm to move towards the exit of the driver. As with the 4” drivers, “positive on black”.
On the old drivers it is just to remove the back-cap and apply a low DC voltage ( ie a AAA battery) to see how the diaphragms moves. On the newer drivers this is not possible but in the MLS rig I can see if the pulse is inverted or not.
I found that both the 2430K and the 2453 show inverted polarity. Can someone here confirm these findings please.
//Rob