JAMO C 803 IW Broşür - Sayfa 14

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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.

Sound pressure level from a speaker with Centre-Plug compared to one

without, when playing at high play-back level.