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PUNCH AUDIOphile MID-RANGE/WOOFERS
The Punch AUDIO
phile
drivers are designed for opti-
mum smooth frequency response. This goal, as with all
Rockford Fosgate products, is achieved by utilizing
“high quality, high-end” component parts.
The “felting stocks” and geometry of the cone body were
selected to provide the smoothest, or flattest, well-
extended high frequency response. In addition, these
“precision mass controlled” rigid paper cone bodies are
properly terminated with “highly compliant” nitrile rubber
edges.
The system’s linear compliance is balanced through the
use of a “proprietary” flat spider design for “symmetrical
control” of the voice coil and cone excursion. The linear
suspension of rubber edges coupled with flat spiders
and the use of long 2-layer voice coils results in drivers
which exhibit low Total Harmonic Distortion (THD) fig-
ures.
To ensure a well controlled high frequency output up to
the 4 kHz transition point of the ND4 tweeter, small voice
coil diameters and vented pole pieces are used. Venting
both reduces back pressure in the voice coil cavity to
reduce “air-rush” noise, as well as allowing for the
circulation of “cooling” air in the voice coil circuit. To
further reduce heat build-up in the voice coil and in-
crease long-term power handling, the pole piece and
field plate surfaces are supplied with a black heatsink
finish.
The pre-treated cloth dust caps are specially chosen so
as not to interfere with the natural response of the cone
and motor combination. They are sonically neutral and
will not radiate or add undesirable resonance in or out of
the driver passband.
Powder coating has long been the industry standard for
durability in protective metal finishes. As an additional
benefit, powder coating is the only finishing process that
is “earth friendly.” It releases no toxic chemicals into our
air and water supplies.
Flat Spider
Design
Voice Coil
Cone Body
Dust Cap
Powder
Coating
Finishes