Whitepaper
5
assembly have been optimized for long excursion without collapsing and generating
distortion.
Despite the fact that the cone assemblies are very light, we have chosen to use a
very powerful motor system to make sure that the cone assembly can start and stop
promptly. Thereby it can transform the tiniest subtle details in the electrical signal to
mechanical movements (and thereby an acoustical signal). To get a high magnetic
flux working on the voice coils in the gab, 25 and 30 mm voice coils have been used
together with double magnets working on the voice coil. Another benefit of using a
large voice coil diameter is that power handling is increased.
To avoid air compression in the cavity behind the dust cap and around the voice coil,
the T-yoke of the magnet system is vented. Thereby air can’t get trapped in the
cavities in the magnet system, which will reduce compression.
The woofers and midranges are mounted without visible screws, which gives a clean
and minimalist visual appearance.
High Frequency Drivers
In the LEKTOR® Series we have designed two tweeter systems with excellent
dynamic capabilities, plenty of headroom and high power handling. At the same time,
they have been optimized for off axis response and timing characteristics that will
make a seamless blend with the response form the woofer/midranges possible.
Aluminum
faceplate
Acoustical
body
Gasket Dome, neodymium
magnet and heatsink
Figure 3, Exploded view of 28mm neodymium tweeter for LEKTOR
®
1.
To optimize the dynamics and headroom capabilities, a large 28mm dome/voice coil
size has been chosen. In comparison with a standard 25mm dome, the 28mm dome
tweeter has approximately 25% more surface area, and thereby it can obviously
move more air. Or, said in another way – the dome should not move as much to
reach a given sound pressure level – motion will thereby be more controlled and
consequently reproduced sound will be more precise. A larger surface area also
leads to better low frequency-capabilities exactly because it can move more air.