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Loudspeaker Components -1About Your Loudspeaker
An International Project
The Klipsch P-39F has drawn on engineering, design and manufacturing resources from all aver the world. In addi-
tion to our formidable team in the USA, we have used European industrial designers, British theoretical physicists
and manufacturing and production specialists from China. The focal point of these resources is our birthplace,
Hope, Arkansas, where, under the vigilant eyes of the most skilled manufacturers of horn loudspeakers anywhere
in the world, your P-39F was built, tested, measured, evaluated in rigorous listening tests, and nally shipped.
The P-39F is the culmination of over 60 years of research and engineering advancements, having been designed
with the most advanced computer aided design (CAD) tools available, rigorously evaluated using our own
in-house proprietary software, built to the most stringent quality standards and voiced by a panel of our most
experienced listeners. No Klipsch loudspeaker has ever had more care and attention to every detail lavished on it
than your P-39F.
Although building one pair of matched loudspeakers is relatively straightforward, building hundreds of matched
loudspeakers is challenging. Measurements play an important role in analyzing loudspeaker characteristics, but
the human ear is the ultimate test gear for evaluating its reproduction quality . At Klipsch, every loudspeaker de-
sign is strictly evaluated using listening tests designed to expose even the very smallest weakness. All nal voic-
ing is performed under blind conditions, using trained listeners and standard audio sound tracks selected based
on their particular area of auditory excellence. All information is tabulated and reported back to the designer for
analysis. In almost all cases, Klipsch products are evaluated against similarly priced competitive models. It is only
in this manner that Klipsch can truly rely on the quality of feedback received, eliminating skewed data that may
result due to inuences caused by price, brand recognition, or visual appeal.
Design
The P-39F is a 3.5-way bass-reex full range loudspeaker with high sensitivity and
extremely low distortion. The ve drivers of the P-39F comprise three 9” woofers,
an advanced 4.5-inch horn-loaded compression midrange driver, and a .75-inch
titanium horn loaded compression dome tweeter. Each driver was designed by
the Klipsch Engineering team and optimized for superior performance within
each transducers bandwidth. Accurate driver design minimizes the need for
driver corrections in the crossover network. Thus, the crossover is a straightfor-
ward design, with extremely high-quality components ensuring minimal insertion
loss. By presenting a simple load to the amplier, overall system performance is
enhanced, a phenomenon rarely found with conventional designs. Each com-
ponent used in the crossover, from the air core inductors to the polypropylene
capacitors, has been selected to provide an undistorted transition between
transducers. The superior components used in the P-39F are complemented by
the unique horn and enclosure design and highlighted by the elemental perfor-
mance of the industrial design. The massive laminated MDF enclosure is based
on a curved non-parallel wall structure for minimal resonance. Both the tweeter
and midrange compression drivers are integrated into a common molded two-
element horn optimized for bandwidth, clarity, and eciency.
Bass Drivers
With 18-mm peak to peak linear excursion, and three 9-inch cones, the P-39F is capable
of remarkably clean dynamic response down to a -3 dB point of 39 Hz.
The woofer utilizes a low mass hybrid Aluminum/Rohacell®/Kevlar® cone with an over
hung voice coil. Even under massive dynamic demand, the driver retains linearity and
low distortion. A three-part high intensity neodymium magnet is used with a main
magnet, plus rear and forward magnets to ensure linearity, reduce stray magnetic
energy and provide intense eld strength in the voice coil gap. Dual Faraday rings on
the pole piece minimize unwanted inductance, enhance heat dissipation and minimize
dynamic compression.
The metal cone of the woofer is damped with a composite Rohacel and Kevlar layers which minimizes ringing
and maintains low mass, eliminating breakup and other distortion products. As is the case with
the midrange driver, the surround uses a at-sided shape that keeps surround-produced
output to a minimum and preserves phase response. The cast aluminum frame assures
maximum heat transfer without any reection of the back wave of the driver that would
otherwise alter the sound. An inverted half-roll low density foam rubber surround com-
pletes the clean appearance.
The woofers see diering pass bands. This preserves consistent dispersion through
the critical woofer to midrange transition region and has a positive impact on o-axis
performance and stereo imaging. This upper woofer covers the entire range from 30 Hz
to 500 Hz, where it crosses over to the midrange driver, while the two lower woofers cover only the
low and mid-bass. This “tapered-array” design delivers full bass impact, plus a graceful transition between driver
groups in both tonal accuracy and dispersion.
Midrange - The midrange is where we live.” Paul W. Klipsch
The inverted dome midrange driver operates from 500 Hz to 3.5 kHz and is a unique
design, not found on any previous Klipsch product.
The driver sensitivity of 106 dB allows minimal excursion at normal playback volume.
As cone excursion reduces, so does distortion. The 4.5-inch aluminum dome is
driven by 3 high temperature N35H neodymium magnets, ensuring linearity under
a range of listening volumes. The pole piece is topped by a copper cap to minimize
unwanted inductive components. The surround has half the density of the material
typically used and thus oers reduced mass. Unlike most designs, this midrange driver delivers much more out-
put from the dome and less from the surround. As a surround is always in motion and always changing shape,
output from its surface is high in distortion—minimizing surround surface area is another means to reducing
overall distortion.
The midrange unit is housed in its own magnetically-shielded sealed
enclosure, which isolates the driver from acoustic energy generated by the
woofers. Every eort has been made to ensure great accuracy, as well as
long-term durability from this unique driver.
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