Room-filling sound without a room-filling speaker cabinet. Slimmer than ever, the 684 offers an amazing combination of serious floorstander power, spectacular audio performance and unbeatable value thanks to its new and vastly improved bass/midrange drivers and the Decoupled Double Dome tweeter. Switching to 5-inch drivers from the previous 6.5-inch designs means the new 684 is significantly slimmer than its predecessor, yet Bowers & Wilkins engineers have still improved its audio performance. The two Kevlar®-cone drivers now feature smaller voice coils to increase sensitivity. The 5-inch drivers now also feature Anti-Resonance Plugs that improve the behaviour of the voice coil and smooth response, a technology taken from our high-end PM1 speakers. The result is a breathtaking performance from a modestly proportioned loudspeaker.