Soul 6

A 10.3-inch paper widebander running with no crossover on it at all, from the bass up to where a horn-loaded supertweeter takes over, in a column 815 mm tall on a 325 mm square footprint. 100 dB of sensitivity means a few watts drive it to a loud room, which is the whole reason people buy Zu. The bass vents through four slots under the cabinet — Zu's Griewe loading — and the gap above the base plate is adjustable, so the bottom end is tuned to the room rather than to the box.