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It features a new combination of a pair of Kevlar® cones for delivering its
bass and midrange. The lower cone is dedicated to bass, which relieves the upper
bass/midrange unit of the duty to handle heavy bass and leads to clearer,
crisper midrange than you might find in smaller speakers. The Nautilus™
tube-loaded, aluminium dome tweeter, featuring a new surround material to
improve spaciousness and imaging, adds needle-sharp top end all the way to 50kHz
and beyond.
The improvements to the drive units in the new 600 Series
make it possible, for the first time, to introduce a minimalist crossover to the
range. The use of components that are fewer in number but higher in quality –
hand-picked in exhaustive listening tests – reduces the degradation of the
signal significantly. So, whether you’re enjoying hi-fi or home cinema, what you
hear is that much closer to what was recorded.
Visually, a refreshed,
contemporary design language and a widened choice of wood finishes allows the
684 to fit in effortlessly with any interior.
| Woven Kevlar |
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| Crossover Tuning |
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| Nautilus Tapering Tube |
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| Flowport |
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| Mushrooms |
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| FST |
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| Tweeter on Top |
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| Matrix |
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| Rohacell |
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| Diamond Tweeters |
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| Sphere / Tube Enclosure |
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| De-Coupling |
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| Nautilus |
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| Technical features |
Nautilus™ tube loaded aluminium dome tweeter |
|
Kevlar® brand fibre cone bass/midrange |
|
Kevlar® brand fibre cone bass driver |
|
Flowport™ |
| Description |
2½ -way vented-box system |
| Drive units |
1x ø25mm (1 in) aluminium dome high-frequency |
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1x ø165mm (6.5 in) woven Kevlar® cone bass/mid |
|
1x ø165mm (6.5 in) woven Kevlar® cone bass |
| Frequency range |
-6dB at 34Hz and 50kHz |
| Frequency response |
44Hz - 22kHz ±3dB on reference axis |
| Dispersion |
Within 2dB of reference response |
|
Horizontal: over 60º arc |
|
Vertical: over 10º arc |
| Sensitivity |
90dB spl (2.83V, 1m) |
| Harmonic distortion |
2nd and 3rd harmonics (90dB, 1m) |
|
<1% 90Hz - 22kHz |
|
<0.5% 120Hz - 20kHz |
| Nominal impedance |
8Ω (minimum 3.0Ω) |
| Crossover frequencies |
150Hz, 4kHz |
| Crossover Filters |
1st Order – tweeter |
|
1st Order – bass/midrange |
|
1st Order – bass |
| Recommended amplifier power |
25W - 150W into 8Ω on unclipped programme |
| Max. recommended cable impedance |
0.1Ω |
| Dimensions |
Height: 910mm/35.8" (not including plinth or feet) |
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Width: 198mm/7.8 |
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Depth: 300mm/11.8 |
| Net weight |
18.2kg (40.1lb) |
| Finishes |
Black Ash Vinyl |
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Light Oak Vinyl (not available in US/Canada) |
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Red Cherry Vinyl |
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Wengé Vinyl | |