Finished the 408. Sounds stellar with my (best) 220. 4 K140 drivers with original cones. The left jack fires the top speaker and bottom middle speaker. This is my 4 ohm option of choice to use with my 120. Removed the doors and used magnetic locks to clamp on the covers. Might redo that a bit when I give them a wash and paint job. Such a massive combo, but dead silent when not playing. True beauty