Vanishing Series In-Wall Center-Channel Speaker: The Polk Audio
Vanishing Series in-wall center-channel loudspeaker (255c-RT) features a
precision-engineered minimally flanged design and Polk's exclusive Sheer-Grille,
which protrudes only 7mm from its surroundings. Installing virtually-flush in
your wall, the Polk Audio Vanishing Series in-wall center-channel loudspeaker
offers a one-cut, drop-in installation and rotating cam stabilizing system. The
Polk Audio Vanishing Series in-wall center-channel loudspeaker provides superior
high-performance sound from its dual 5.25" woofers and aimable 1" tweeter, with
Reflective Room (Tweeter) Compensation control.
Infinite Enclosure Design
Dynamic Balance Technology: Laser imaging technology allows
Polk Audio engineers to see the entire vibrating surface of a driver and
tweeter; they can actually see the resonance develop on the speaker
cones-resonance that is the root cause of loudspeaker distortion. Being able to
see the resonance develop, they then determine the Dynamic Balance of high-tech
materials, geometry and construction that together effectively tune out the
offending resonance. Exclusive Dynamic Balance Composite Material Technology
delivers sound that is effortlessly clean and clear, even at lifelike volume
Klippel Optimized Motor Structures: The Klippel Distortion Analyzer
allows Polk engineers to optimize each driver's motor structure, voice coil
alignment and suspension to insure smooth, unimpeded movement even at extreme
listening levels. This is especially important in the shallow depth area
afforded an in-wall built-in loudspeaker.
Dual Midranges: The Polk Audio Vanishing Series in-wall center-channel
loudspeaker employs two 5.25" Dynamic Balance mineral composite polypropylene
cone midrange drivers with rubber surrounds for a smooth, consistent frequency
response. Each midrange driver features a lightweight, strong composite basket
that work in conjunction with Klippel Optimization to keep moving parts in rigid
alignment while further damping performance-robbing resonances.
Silk Dome Tweeter: The Vanishing Series in-wall center-channel
loudspeaker employs a 1" Dynamic Balance silk polymer composite dome tweeter for
crisp, clear imaging. The high-performance silk dome tweeter in the Vanishing
Series in-wall center-channel loudspeaker features a 15° swivel housing, for
more direct high frequency control, excellent off-axis imaging and more
Reflective Room (Tweeter) Compensation Control: An easily accessible
Reflective Room (Tweeter) Compensation switch allows you to make advanced audio
tweaks to optimize the sound for any installation. Use the Reflective Room
(Tweeter) Compensation switch to digitally compensate for harsh reflective
surfaces. It doesn't merely reduce high frequencies; it actually allows you to
"notch-out" a specific area of the spectrum (3500-6000Hz) where room acoustics
most often interfere with performance.
- Filter Setting: If your listening room is very reflective, with
smooth sheetrock walls, hardwood floors, and non-cushioned furniture, the
sound will be overly "bright" and unnatural. Selecting the "Filter" setting
compensates for the effect of reflectivity in a hard room. Tweeter
attenuation flattens room response, without hindering higher frequency
response, for warmer, more realistic sound and more accurate imaging.
- Normal Setting: If your room is not reflective, with curtains,
artwork, lots of cushioned furniture and carpeting, sound will be absorbed
by the room, resulting in more realistic reproduction and more accurate imaging. In this case, select the Normal setting.
Timbre Matched: The Polk Audio Vanishing Series in-wall center-channel
loudspeaker is timbre-matched to Polk Audio's high-performance RTi bookshelf and
floor-standing loudspeakers. This allows you to match them to an existing Polk
Audio home theater speaker system and enjoy seamless blending from speaker to
speaker. Timbre-matched speaker components will insure the same true response
throughout your system.
Frequency Response: The overall frequency response of the
in-wall center-channel loudspeaker is 30Hz to 27kHz, and the -3dB frequency
response is 50 to 25kHz.
Infinite Enclosure Design
Infinite Baffle Tuning: Infinite Baffle Tuning uses the
virtual enclosure of the in-wall space for deep bass response and superior
Wafer-Thin Sheer-Grille: The Polk Audio Vanishing Series in-wall
center-channel loudspeaker features Polk's exclusive wafer-thin Sheer-Grille, a
magnetically-secured grille that protrudes only 7mm from its surroundings. The Sheer-Grille can be painted to match your décor, making it virtually
indistinguishable from its surroundings. The Sheer-Grille has nearly
transparent, ultra-small perfs, and are acoustically inert, for dynamic,
unimpeded sound and more uniform coverage, even in larger rooms.
Note: We highly recommend you use a can of spray paint matched to
the wall color you want the Sheer-Grille to blend with. Never use a brush or
roller to paint the grille, as this will clog the perf holes.
Gold-Plated Spring-Loaded Posts: The in-wall center-channel
loudspeaker has a gold-plated pair of spring-loaded binding posts that can
accept up to 12-gauge wire, single banana plugs, or pin connectors.
Applications: You can use the Polk Audio Vanishing Series in-wall
center-channel loudspeaker to complete a system of traditional loudspeakers or
in-wall speakers, by adding an inconspicuous center-channel speaker.
Placement: The in-wall center-channel loudspeaker is designed to be
installed above or below your flat-panel television. Install the in-wall
center-channel loudspeaker as close to ear level as possible. If the speaker
needs to be installed lower or high than ear level, then aim the tweeter
Note: Do not block the in-wall center-channel speaker with your TV
or furniture, as this will disrupt and muffle the sound.
Rotating Cam System: The Polk Audio in-wall center-channel loudspeaker
utilizes a rotating cam system to ensure a secure, vibration-free installation.
Installation: The Polk Audio Vanishing Series in-wall center-channel
loudspeaker (255c-RT) can be installed in new or existing construction.
- Existing Construction: In existing walls, use the included
cardboard template for one-cut, drop-in simplicity. Achieve secure,
vibration-free efficiency with a simple turn of Polk's Rotating Cam system
(5 rotating cams).
- New Construction: Pre-construction brackets (sold separately) are
available for new-build or open-wall retro-fitting.
||Model # 255c-RT
|Overall Dimensions (with grille)
||Width = 14.8125"
Height = 9.3125"
||Width = 13.0625"
Height = 7.5625"
|Product Depth (including grille & wiring)
||Depth = 4.125"
|Mounting Depth (using 1/2"
||Depth = 3.75"