Jamo D 7 SUB Owner/User Manual - Page 23

normal res. freq.

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The 1" tweeter features a completely new design of the diaphragm/dome called Dual Concentric D 7 tweeter cut through view Diaphragm. The coated textile diaphragm looks like two rings, one on the "inner" and one on the "outer" side of the voice coil - hence the name "Dual Concentric". The quite eye-catching centre plug has two purposes: It is a wave-guide and it clamps the diaphragm. The magnet features a vented pole piece leading into a chamber at the backside. The chamber and the "ventilation hole" in the pole piece are tuned in for achieving the very low resonance frequency at 600Hz (normal res. freq. for a tweeter is around 1.5k Hz). The voice coil former is made of aluminium for optimum heat disposal. The voice coil is made of cupper plated aluminium wire, because aluminium weighs less than cupper, but the copper plating is needed because of its conducting qualities. In fact, the choice of "motor" materials makes use of magnetic oil for cooling and resonance damping superfluous! The "wire" from the driver's terminal to the voice coil is a thin litz wire. Usually, the voice coil wire continues to the terminals. However, litz wire features much higher 13

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13
The
1"
tweeter
features
a
completely
new
design
of
the
diaphragm/dome
called
Dual
Concentric
Diaphragm.
The coated textile diaphragm looks like two rings, one
on the “inner” and one on the “outer” side of the voice
coil – hence the name “Dual Concentric”.
The quite eye-catching centre plug has two purposes: It
is a wave-guide and it clamps the diaphragm.
The magnet features a vented pole piece leading into a
chamber at the backside. The chamber and the
“ventilation hole” in the pole piece are tuned in for
achieving the very low resonance frequency at 600Hz
(normal res. freq.
for a tweeter is around 1.5k Hz).
The voice coil former is made of aluminium for
optimum heat disposal. The voice coil is made of
cupper plated aluminium wire, because aluminium
weighs less than cupper, but the copper plating is
needed because of its conducting qualities.
In fact, the choice of “motor” materials makes use of
magnetic oil for cooling and resonance damping
superfluous!
The “wire” from the driver’s terminal to the voice coil is
a thin litz wire. Usually, the voice coil wire continues to
the terminals. However, litz wire features much higher
D 7 tweeter cut through view