3
GB
Design Background
In the development of this loudspeaker series we have given a high priority to obtaining a neutral and natural sound balance, so that the
sound is reproduced with the exact same tonal characteristics as the original material. A natural benefit of this is that these loudspeakers
are able to reproduce all forms of music, speech
etc. without adding any sort of colour to the sound.
Having started out with such an ambitious goal, an obvious requirement is to avoid any sort of compromise in the entire selection of
materials - from terminals to cables, drivers and cabinets.
In the actual developing phase we have therefore carried out listening tests of countless components before making the final selection.
We have also tested innumerable combinations of amplifiers, CD players and cables with all types of music and speech in order to ensure
construction of an entirely unique loudspeaker series to give you optimum performance in all circumstances.
Tweeter
The tweeter used was chosen because of its musical and ultra-precise reproduction capabilities.
This has been achieved partly by using a special SONOTEX diaphragm - the result of a process where the textile diaphragm is coated four
times to achieve the optimum combination of rigidity and internal dampening.
In order to prevent over pressure/under pressure from forming behind the diaphragm, this is vented through a hole in the magnet
leading into a carefully dampened chamber, mounted at the back of the unit. We have focused on obtaining a high sensitivity to allow
reproduction of the fine treble details, and therefore the voice coil is wound with silver thread and is controlled by a double magnet
system. Furthermore, the unit is equipped with low-viscosity magnetic oil, partly to ensure optimum cooling of the unit - and thereby a
high load capacity - and partly to dampen undesired resonances. The front baffle of the tweeter has been die-cast in solid zinc, which
ensures maximum mechanical contact with the cabinet and a minimum amount of undesired resonances. In addition, the tweeter area
on the front panel is slightly horn-shaped, resulting in a more linear reproduction of the lower treble to ensure optimum transition to the
midrange unit.
Woofer/Midrange Unit
In the D 8 series we wanted the important midrange area to be handled by a single unit, partly to achieve optimum phase characteristics.
However, this makes high demands on the unit used, as it must be able to reproduce a wide frequency spectrum and thus be able to
endure high loads.
The units diaphragm is made in die-cast magnesium - a very light and rigid material - and mounted in natural rubber suspension, which
effectively prevents vibrations from travelling back to the diaphragm. Therefore, the result is a very well-controlled diaphragm that will
operate without break-ups up to a full 4 kHz. Furthermore, the highly controlled break-ups can be completely eliminated in the crossover
network.
Waterfall plot showing the well-controlled diaphragm
break-up characteristics of the D 8 unit.
Waterfall plot showing the diaphragm break-up
characteristics of a good conventional woofer/midrange.
The heavy-duty magnet system has built-in copper rings which ensure significantly reduced distortion, as they will short out the eddy
currents which the voice coil will inevitably send into the magnet system when the signal current runs through it.
The units most eye-catching feature, however, is probably its backed-off copper phase plug. When a phase plug is used, it is no longer
necessary to mount a dust cap over the voice coil.
The advantage of this is that break-ups around the mounting point of the dust cap are avoided. As the phase plug is manufactured in solid
copper, it will also improve the efficiency of the copper rings and at the same time effectively remove heat from the magnet system.
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