note: not THE SMALLEST driver.

but Smaller,One that has enough Vd, 10/12" units have enough thesedays.

Xmax getting into the inches!

Rear chamber size becomes a problem with 18" units etc

There just isnt a point when compactness is required

Im only using my jbl 2226 on a horn because i own it already and want to use it. a new 10" will achieve much the same SPL on a horn,with compactness and only slightly reduced output