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The large voice coil in combination with a powerful
neodymium magnet, results in a very powerful motor,
making the unit capable of high sound pressure
level/power handling.
The magnet is magnetically shielded.
Woofer
The
5½"
was
also
developed specially for
the D 7.
The
aluminium
diaphragm material was
chosen
due
to
high
rigidity and the fact that
it is "airtight" (the air
D 7 Woofer
pressure
inside
the
cabinet cannot penetrate
the diaphragm).
A pattern of small round stamps in the diaphragm
makes it even more rigid.
The basket is made from rigid and open-structured
ABS.
The ABS material features a higher internal damping
than that of a conventional metal basket.
The open structure of the basket, also behind the
spider, ensures high airflow and prevents under-
/overpressure at low frequencies - allowing free and
fast movement of the diaphragm. This becomes an
extremely important feature as excursions of +/- 8 mm
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