The Decoupled Double Dome tweeter found in the 685 S2, and the rest of the new 600 Series, is technology taken straight from our award-winning CM10 speaker. A dual-layer design combines a thin aluminium dome for lightness and a thicker aluminium ring for rigidity – the result is absolutely stunning, with far greater clarity in the audible spectrum.
The tweeter is also decoupled from the main cabinet, kept physically separate in its own cavity with a ring of gel cushioning it from vibrations. This improves imaging and dispersion for a more natural, spacious treble.
As well as a decoupled, double dome aluminium tweeter, the two-way 685 S2 features a full-range 6.5-inch driver constructed from woven Kevlar and using Anti-Resonance Plug dustcaps, as seen in high-end Bowers & Wilkins speakers. The result is stunning audio quality from a highly versatile smaller speaker.
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
Description 2-way vented-box system Drive units 1x ø25mm (1 in) aluminium dome high-frequency
1x ø165mm (6.5 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% 95Hz - 22kHz
<0.5% 140Hz - 20kHz
Nominal impedance 8Ω (minimum 4.0Ω) Crossover frequencies 4kHz Recommended amplifier power 25W - 100W into 8Ω on unclipped programme Max. recommended cable impedance 0.1Ω Dimensions Height: 345mm (13.5 in)
Width: 190mm (7.5 in)
Depth: 324mm (12.8 in)
Net weight 6.8kg (14.9 lb) Finishes