JAMO C 80 Series Broschüre - Seite 14

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JAMO C 80 Series Broschüre
Another advantage of our hard cones is a very good suppression of sound refl ec-
tions inside the cabinet, no surprise given that it's virtually airtight (the air pressure
inside the cabinet cannot penetrate the diaphragm).
The magnesium basket confers several benefi ts:
First of all it makes it possible to create a very 'open' basket – even behind the spi-
der – thus ensuring high airfl ow at low frequencies, avoiding refl ections at high
frequencies and preventing under-/overpressure causing mechanical losses.
Secondly, as magnesium is a non-magnetic material, the magnetic force does not
spread out in the basket, but stays concentrated where it is needed; around the
voice coil.
Last but not least, the very rigid material ensures that the heavy magnets and the
voice coil are always perfectly aligned with the voice coil, in the exact centre of the
magnet gap.
To ensure that the drive units are fi rmly attached – and airtight – they are mounted
using 6 screws.
Centre-Plug
However, the anodised aluminium centre plug is probably the most visible feature
of the C 80 woofers.
It replaces the traditional dust cap in the centre of the loudspeaker cone at the
place where the dust cap would normally be mounted, thereby making the cone
lighter and thus 'faster' sounding.
This also prevents potential break-up points where the dust cap would have been
glued to the cone.
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Sound pressure level from a speaker with Centre-Plug compared to one
without, when playing at high play-back level.