We get to hear many drivers & enclosures… building most of them.
Hard to choose just 3… the not so good ones don't stick around.
The uFonkenSET with FF85wKen (althou performance in the bass improves in the Frugel-Horn Lite, but still limited)
The Frugel-Horn Mk3 with Alpair7.3eN (i prefer copper drivers, and that this design spawned the larger Frugel-Horn XL, and the smaller Frugel-Horn Lite). This box design has proven very versatile with a new personality just with a change of drivers. The medium one in the picture, here with FE126eN^2.
The FonkenPrime with FE127eN^2 (here in maple with FE127eN), not the best, but it was the forerunner of a very broad set of decedents that on the whole are outstanding speakers.
It will be noted that the drivers are all EnABLed, which jumps the entire system up a level in performance.