JAMO D 400 Description technique - Page 9

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In fact, the choice of "motor" materials makes use of magnetic oil for cooling and

resonance damping unnecessary!

All these features in combination

very natural, detailed, dynamic and open sound reproduction.

Mid-woofer/woofer

The woofer of the D 4 speakers features a brand new wood fibre cone.

This unique cone is made from wood fibre material, characterized by

very uneven fibres with different resonance properties. And thus, when

these fibres are pressed into shape to form a loudspeaker cone, the

different fibres will prevent each other from vibrating.

Furthermore the cone is coated twice in order to fine-tune rigidity and

internal damping.

First it is lacquered on both sides for increased stiffness – and as a side

benefit UV resistance is obtained - and secondly it is coated on the

backside with a tough hardening resin to maximise internal damping.

The result is a cone with very well controlled break up modes resulting in

extremely low distortion all over and a very open and detailed midrange

for optimum voice reproduction.

To ensure that the units are firmly attached – and airtight – it is mounted using 6 screws,

and the backside of the basket features two thin silicon stripes. Besides from ensuring air

tightness, the silicon stripes also prevent any potential vibrations that could arise between

the cabinet and the unit.

allow the diaphragm to move effortless and the

The basket is made of magnesium giving several benefits:

First of all it makes it possible to create a very open basket

– even behind the spider – thus ensuring high airflow at

low frequencies, avoiding reflections at high frequencies

and preventing under-/overpressure causing mechanical

losses.

Secondly, as magnesium is a non-magnetically material,

the magnetic force from the magnet does not spread out

in the basket, but stay concentrated where it is needed;

around the voice coil.

Finally, the very rigid material ensures that the heavy

magnets and the voice coil always are perfectly aligned

with the voice coil in the exact center of the magnet gap.

result is a