Manual JBL Project K2 S9900 (page 16 of 42) (English, All languages)

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A high-purity copper sleeve is used for the polepiece. This greatly improves

the electrical conductivity of the copper sleeve for lower coil inductance and

thus greater high-frequency output at 15kHz and above. The copper-sleeved

pole quickly wicks away heat generated by the coil, thereby contributing to

a reduction in dynamic power compression. To compensate for the higher

resistance caused by the use of a copper-sleeved polepiece, a large magnet

area has been used, in conjunction with special high-grade and high-temperature-

grade neodymium.

The phasing plug is a traditional JBL rapid-ﬂare, coherent-wave four-slot design.

This coherent-wave design shapes the wave output, producing a truly coincident

wave front as the sound enters the Bi-Radial horn. The diaphragm is formed

of magnesium-alloy foil and is the ﬁrst JBL large-format 100mm compression

driver to use this special material. Magnesium alloy is essentially 95 percent

pure magnesium with small percentages of aluminum, zinc and other alloys

added to improve characteristics such as diaphragm forming, fatigue strength,

corrosive and acoustic properties. A proprietary thermal process is used to

form the thin sheets of magnesium alloy into the 100mm diaphragm shape

of exacting dimensions. This new process even enables the integrated JBL

Diamond surround to be formed as one piece with the dome. Forming the

diaphragms out of sheets of this magnesium-alloy foil yields greater reliability

and resistance against fatigue and corrosive failures than diaphragms formed

with 100 percent pure magnesium or aluminum.

Magnesium has very low density, slightly lower than even that of beryllium.

With such a low density, the thickness of the magnesium-alloy diaphragm could

be greatly increased while still maintaining an equivalent diaphragm mass of

approximately 3.4 grams, similar to previous designs using aluminum and

titanium. Based on this, the new magnesium-alloy diaphragm was increased

to 130 micron, about 1.7 times thicker than the standard 76-micron-thick

aluminum diaphragm. When compared to the titanium diaphragm used in the

original K2 S9500 and M9500 systems, this new magnesium-alloy diaphragm is

2.5 times thicker. This is beneﬁcial because a thicker diaphragm creates a much

stiffer diaphragm, which pushes pistonic behavior to higher frequencies than

current aluminum or titanium diaphragms (given the same moving mass).

Better pistonic behavior means less diaphragm modal breakup at the critical

mid-band frequencies, and so the upper frequency response will be smoother

with minimal distortion spikes. The effects of this will be less distortion, and

improved and extended frequency response (Fig. 5).

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JBL Project K2 S9900 Manual

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