JAMO D 4CEN Technische Beschreibung - Seite 10

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However, the anodised aluminium centre plug is probably the most

conspicuous feature of the D 4 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.

Also this prevents potential break-up points where the dust cap

would have been glued to the cone.

In addition, it prevents over- and under pressure behind the dust cap

The mid-woofers all feature lightweight 2-layer voice coils in order to achieve maximum

"attack" (the ability to start and stop precisely) and minimum distortion – these acoustic

properties are of utmost importance for optimum voice reproduction.

In the designated woofer for the D 450 there is a small but significant difference.

It is supposed to work only at the lowest frequencies. By using a heavy 4 layer voice coil,

we can reduce sensitivity at high and mid frequencies while gaining efficiency at low

frequencies.

This works in 2 ways: A high B*L product** will increase port output and reduce bandwidth

around port resonance. The increased weight will counteract the increased B*L at higher

frequencies. The result is a gain of about 3 dB at low frequencies compared to the 2 layer

type in the same cabinet.

**The combination of magnet size/force and length of the voice coil wire results in the so-called B*L Product. In popular

you could call this the size of the "engine" in a loudspeaker.

when the cone moves back

and forth. The advantage is

more dynamic and precise

sound reproduction.

The aluminium centre plug also has a cooling

effect on the voice coil providing greater power

handling capability and very important, a stable

sound reproduction when playing loud.