only the center driver plays center channel program material through the upper midrange
all the way up to its crossover point with the center tweeter (80Hz -
4
kHz). Meanwhile,
the outer tweeters are also employed as “super tweeters” (6kHz – 20kHz) for center
channel material in addition to serving their primary duties in the reproduction of Front
(FL/FR) and Surround (SL/SR) channels. So as to avoid unwanted localization, the
outer tweeters’ acoustic output is appropriately delayed.
OCA results in an unprecedented clarity and intelligibility of center channel information
over a very wide listening area. Even listeners far to the side hear vocal reproduction
and other center information with similar tonal balance to on-axis listeners. Everyone
hears natural sounding, clear dialog, musical instruments and center-channel effects that
are firmly anchored to the screen.
Dolby Digital & DTS Decoding
Both optical inputs can decode
and reproduce
Dolby Digital 5.1 and DTS 5.1 program
material. Many bars may decode but few will play back all of the discrete channels as
intended for optimal surround performance and fidelity.
Full Complement Bass (FCB)
All five 2 1/2" drive units reproduce the summed L/C/R/SL/SR channels over the 80Hz to
200Hz passband, in addition to serving their normal duties as centers, surrounds
(main/SDA), lefts (main/SDA) or rights (main/SDA). FCB provides the equivalent surface
area of a 5 1/4" mid-bass driver to give the lower midrange and upper bass tonal
richness and speedy transient response, ensuring that no single driver is overtaxed
since all share the demanding 80-200 Hz band equally. The low 80 Hz crossover point,
achievable by employment of FCB, effectively eliminates localization of the subwoofer.
SDA
®
Surround
SDA
Surround is a two-channel technology
originally developed by Polk which was
intended to overcome a fundamental
problem of stereo reproduction known as
Interaural Crosstalk (see Figure 1) when
listening to 2 separate loudspeakers.
SurroundBar SDA Surround technology
utilizes the same basic principles but
expands it to produce a precise image that
wraps around the listener from a single bar
type speaker. SurroundBar technology uses
techniques similar to those used in noise
canceling headphones to cancel out the
sounds that tell your brain where the
speakers are actually located. The
technology then replaces those with sounds
that, to your ears and brain, are
indistinguishable from actually having sound
Figure 1
