Switching to 5-inch bass/midrange drivers from the previous 6.5-inch cones, means the 684 S2 is now significantly slimmer than its predecessor, with simultaneously improved audio performance, thanks to Bowers & Wilkins innovation. The two Kevlar cone drivers benefit from smaller voice coils to increase sensitivity.
The 5-inch drivers now also feature Anti-Resonance Plug dustcaps, technology taken from our high-end PM1 speakers, that improve pistonic movement inside the voice coil. This helps to deliver amazingly distortion-free midrange performance, all in a smaller space.
As well as slimmer, improved driver performance, the 684 S2 also features a Decoupled Double Dome tweeter. Double dome technology, brought across from the CM10, increases tweeter rigidity for a more precise sound, while the tweeter sits in a gel-filled cavity, decoupled from the surrounding cabinet - which removes resonances and vibrations, for a more natural, spacious sound.
Woven Kevlar Y Crossover Tuning Y Nautilus Tapering Tube Y Flowport Y Technical features Decoupled Double Dome aluminium tweeter with Nautilus™ tube loading
Kevlar® brand fibre cone bass/midrange drivers
Description 2-way vented-box system Drive units 1x ø25mm (1 in) aluminium dome high-frequency
2x ø130mm (5 in) woven Kevlar® cone bass/
Frequency range -6dB at 45Hz and 50kHz Dispersion Within 2dB of reference response
Horizontal: over 60º arc
Vertical: over 10º arc
Sensitivity 87dB spl (2.83V, 1m) Harmonic distortion 2nd and 3rd harmonics (90dB, 1m)
<1% 140Hz - 22kHz
<0.5% 180Hz - 20kHz
Nominal impedance 8Ω (minimum 4.0Ω) Crossover frequencies 4kHz Recommended amplifier power 25W - 150W into 8Ω on unclipped programme Max. recommended cable impedance 0.1Ω Dimensions Height: 920mm (36.2 in) cabinet only
Width: 160mm (6.3 in) cabinet only
Depth: 234mm (9.2 in)
Net weight 14.2kg (31.2 lb) Finishes Black Ash