ARENDAL 1723, Handbook, Page: 23 / 57

Lack of compression =
extreme dynamics
The airfl ow venting below the dust cap (venting holes
in the cone body) and the spider (venting holes in the
frame) have been added for two very important reasons:
1. We have improved the Airfl ow venting compared to
the previous version by adding more vents in the
bobbin body to further increase the air fl ow under the
spider for better heat dissipation and to reduce air-
rush noises even further, resulting in less distortion.
Air heated by the voice coil is forced away with each
stroke of the cone diaphragm. This continuous
exchange of air mitigates thermal compression and
signifi cantly increases the woofer’s overall power
handling capability while reducing distortion.
2. The airfl ow relieves the asymmetric compliance
(suspension stiffness) and distortion due to the non-
linear compression and dilution of the air typically
trapped under the dust cap and spider. Typical vented
pole designs are limited in their effectiveness due to
the lack of airfl ow volume at maximum power and
excursions, because where a free, smooth airfl ow is
most needed, the pole vent alone is not suffi cient.
The new Arendal Sound 1723 Subwoofers utilize an ultra-
high temp polyimide former with an aluminium voice
coil for low mass, high motor force and optimum thermal
dissipation.
The benefi t of using aluminium instead of copper in this
format is that the weight is signifi cantly reduced and heat
exchange is substantially increased, while the conductivity
decreases only slightly compared to copper. This means
that a driver with less moving mass can handle more
power without the voice coil burning up. In sum, this
means a driver that can handle more power and that has
better transient response.