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Polk Audio® Vanishing LS Series White In-Wall Center Channel Speaker

Model #: 255c-LS
Polk Audio
At a Glance

With a Vanishing® Series in-wall center channel speaker, you have the centerpiece of a world-class stealth home theater. All you see is screen, and all you hear is crystal clear dialogue, dynamic detail and directional effects. The Vanishing Series center channel speaker anchors the action without attracting attention. It's the state-of-the-art in today's most wanted interior design plans.

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$99,999.00Save $NaN

Get to know this product.

  • Vanishing Series built-in speakers feature our exclusive wafer-thin Sheer-Grille™, a magnetically-secured grille that protrudes only 7mm from its surroundings. Sheer-Grilles have nearly transparent, ultra-small perfs, and are acoustically inert, for dynamic, unimpeded sound and more uniform coverage, even in larger rooms.
  • Painted to match your décor, Vanishing Series built-in speakers are virtually indistinguishable from their surroundings.
  • Enhanced, reengineered ring radiator tweeters extend top-end response for incredible details and realistic imaging.
  • Reflective surfaces in rooms can make sound brighter and cause image distortion. Engaging the Vanishing reflective room compensation feature (by selecting the low setting) lowers the tweeter level to compensate for reflective surfaces. Vanishing reflective room compensation is a custom audio control that cuts the level only in the 4-5kHz range, exactly where reflectivity destroys sound quality. Outside this narrow 1kHz band, the tweeter retains its detailed and accurate high frequency response, for no loss of realistic musical details.
  • Vanishing Series LS speakers are timbre-matched to Polk LSi speakers to insure utterly seamless blending from speaker to speaker in systems that combine traditional and built-in speakers.
  • If positioning limitations demand that your loudspeakers be installed closer than 2 feet from side walls, the proximity of the surface can result in a response bump between 50 and 200Hz. This can create boomy sound. The Vanishing wall distance toggle switch is a custom audio control that adjusts the crossover to flatten response and tune out boominess, without sacrificing deep bass response, for more lifelike sound and more flexible placement.
  • PowerPort® bass venting is Polk's patented design for smoothly transitioning the air flow from the port into your listening area, eliminating turbulence and distortion, for bigger, more efficient, deep bass impact.
  • Easy one-cut, drop-in installation puts built-in audio within reach, with Perfect Fit templates, a precision flange, and (available) pre-construction brackets; achieve secure, vibration-free efficiency with a simple turn of the patented Rotating Cam system.
Useful Documents


Connector Type:Gold-Plated Pair of Push Connectors


Driver Component Size:5.25" x 2


Mount Depth:3.25


Sold As:Each


Sensitivity:91 dB
Speaker Type:In-Wall Speaker
Frequency Response:30Hz - 33,000Hz




Total Pieces1


Included Accessories(1) Wall Mounting Template; (1) Polk’s Wafer-thin Sheer Grille™ - White, Paintable
Optional Accessories(1) PB LCiC - Pre-Construction Bracket

Shipping Cartons

Carton 16.25" (15.88 cm) h x 11.25" (28.58 cm) w x 16.75" (42.55 cm) d - 9 lbs (4.08 kg)


Lifetime WarrantyYes

Built-In Center Channel Speaker

Quantity Included1
Depth7.38" (18.75 cm)
Weight6.86 lbs (3.11 kg)
Driver Enclosure TypePowerPort Bass Vented
Driver Complement(2) 5.25" (13.34 cm) d (Round) Dynamic Balance aerated polypropylene cone and rubber surround - Mid/Woofer; (1) 1" (2.54 cm) d (Round) Dynamic Balance ring radiator tweeter - Tweeter
Grille Dimensions9.31" (23.65 cm) h x 13.81" (35.08 cm) w

In-Wall Mount

Available OrientationsHorizontal
Dimensions7.63" (19.38 cm) h x 13.13" (33.35 cm) w

Audio Quality

Total Frequency Response30 Hz → 33,000 Hz
Nominal Impedance8 ohms
Sensitivity (1 watt @ 1 meter)91 dB
Lower and Upper -3dB Limits44 Hz → 29,000 Hz


Speaker Inputs(1) Pair of Push Connectors - Gold-Plated

External Amplifier

Recommended Amplifier Power Per Channel10 watts → 150 watts

Misc. Specs

RMS Power Handling (Watts)150
Impedance8 ohms
Maximum Power Handling (Watts)150
Number of Speakers1
Tweeter CompositionSilk Radiating
Depth (in.)3.75
Height (in.)9.31
Width (in.)14.81
Woofer Composition Polypropylene Cone
WarningProposition 65 Warning for California Residents