Having built dozens of single driver speaker designs, many of which were designed by Scott Lindgren, I must say the pensil cabinet with the Mark Audio Alpair 10 v.3 is a stellar performer.
Numerous accolades abound regarding this driver.
I built my pair using Baltic Birch, Walnut Veneer from Rockler,
Lamp Black paint from General Finishes, outriggers, binding posts and binding post plates from Dayton Audio. This is my personal current reference speaker.