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Driver
Technology
Enclosure Design
Connections
Mounting Options
Driver Technology
Tweeter: The LSiFX uses the
same Ring Radiator tweeters as the rest of the LSi Series. This produces a
seamless front stage and lifelike surround environment. The
ultra-light woven Ring Radiator Diaphragm delivers flat response, precise detail
and overall accuracy. A High Frequency Waveguide prevents phase cancellations
for smooth, uniform frequency response and wide dispersion. A Low Frequency
Waveguide promotes laminar airflow between chambers to prevent air turbulence.
This feature serves the same function as Power Port for Polk's bass systems.
Cascade Tapered Driver Array: This
driver crossover design provides wide horizontal dispersion so off-axis listeners
hear clear, uncolored center dialog and effects. When two drivers are placed
side by side, as they often are in center channel speakers, interference effects
between the two drivers in the upper-midrange narrow the horizontal dispersion
and create frequency response errors (called "comb filtering") for
off-axis listeners. People sitting off to the side of the room won't hear the
same clarity as on-axis listeners. To solve this problem, Polk uses
"Cascade Tapered Array" crossovers. One driver is crossed over much
lower in frequency and is in essence a bass-only driver. Only one driver plays
the upper midrange frequency range thereby eliminating the interference effects
between the two drivers. The result is clean, clear and intelligible dialog and
center channel effects for every listener in the room.
Basket: The cast aluminum driver baskets resist
flexing and "ringing" for ultra-tight bass and coloration-free
midrange.
Crossover: Polk uses premium crossover components for
consistent high-end sound quality. The mylar bypass capacitor in the high-pass
crossover extends and flattens high frequency response. The (Cascade Tapered
Array) crossover points are:
- 2400Hz 18dB/octave high-pass
- 2400Hz 12dB/octave low-pass
- 200Hz 12dB/octave low-pass
Timbre-Matched: Timbre-matched with the LSi
Series for a seamless, realistic surround sound experience.
Enclosure Design
Acoustic Resonance Control: Sound emanating from the back of the
driver creates an "organ pipe" resonance at a frequency that is a
function of the depth of the cabinet. This internal cabinet resonance can impart
a thick character to voices. Polk's patented Acoustic Resonance Control (ARC)
port system overcomes this problem. In addition to the Power Ports on the rear
of the cabinet, Polk uses small ports on the front tuned to suppress the
internal cabinet resonance. Thanks to patented ARC technology, you'll enjoy clear and natural midrange.
Power Ports: Dual rear-firing
Power Ports built into the back plate provide distortion-free bass and surprisingly
deep bass response.
Grille: The open architecture low
diffraction grille is used for spacious imaging.
Connections
Bi-Amplification: Since this
speaker may be bi-amplified, you can improve the sound by using separate amplifiers for the
tweeter and woofers. Note that the jumpers connecting the 2 pair of 5-way binding posts
must be removed when bi-amplifying.
Mounting Options
Placement: Designed for use
only as a center channel speaker, the dispersion pattern of the speaker has been
optimized for horizontal placement directly above or below a television set.
Wall Mounting: The Power Ports
double as convenient wall mounting brackets with key hole slots.
