Dynamic Balance is a proprietary Polk Audio technology using laser imaging to
determine what combination of speaker materials create the least amount of
resonance. Eliminating resonance in speakers results in a wide, smooth response
and low distortion.
Subwoofers: Each speaker
features a side-firing 8" poly cone woofer with a rubber surround for deep
bass response. On the left-channel speaker, the subwoofer is located on the
lower portion of the left panel. On the right-channel speaker, the subwoofer is
located on the lower portion of the right panel.
Aerated Polypropylene Midranges:
Each speaker uses two Aerated Polypropylene midrange cones for wide response and
low distortion. For superior durability, the midranges use rubber surrounds.
1" Ring Radiator Tweeters: Each
speaker features a 1" Ring Radiator tweeter for crisp, transparent highs.
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
Cast Aluminum Driver Baskets:
Cast aluminum driver baskets resist flexing and "ringing" for
ultra-tight bass and coloration-free midrange.
Cascade Tapered Crossovers: The
Cascade Tapered Crossover array in each speaker ensures flat midrange response
and improves imaging focus, and depth. One midrange driver is crossed over much
lower in frequency and is in essence a bass-only driver. Only one midrange
driver plays the upper midrange frequency range thereby eliminating the
interference effects between the two midrange drivers. This gives you the
dynamic impact of double drivers with the accuracy and life-like imaging of a
single driver system.
Power Port Venting System: Each
speaker has a floor-coupled Power Port venting system built into its pedestal
for precise deep bass response. This venting system allows air velocity
to slow gradually, vastly reducing air turbulence, and delivering greater bass
efficiency than conventional ports.
Acoustic Resonance Control (ARC):
Internal cabinet resonance can impart a "thick" character to voices.
Polk's patented Acoustic Resonance Control port system overcomes this problem.
In addition to the Power Port venting system, each speaker has two front-firing
ports that are tuned to suppress the internal cabinet resonance, resulting in
smooth, natural midrange reproduction.
Low-diffraction Grilles: Each
speaker employs open architecture low-diffraction grilles for spacious imaging.
Binding Posts: Each
speaker has two sets of gold-plated 5-way binding posts connected by gold-plated
jumpers. Using the dual 5-way binding posts, you can bi-amp or bi-wire the
Carpet Spikes: When the spikes,
along with the rubber feet, are installed, the speaker height increases to
45.225". With the spikes installed and the rubber feet removed, the speaker
height is 45.083".
Frequency Response Note: The
overall frequency response is 22Hz-27kHz and the -3dB frequency response is
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