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Polk Audio® Vanishing® Series 5.25" White In-Wall Center Channel Speaker
Polk Audio® Vanishing® Series 5.25" White In-Wall Center Channel Speaker 0
Polk Audio® Vanishing® Series 5.25" White In-Wall Center Channel Speaker 1

Polk Audio® Vanishing® Series 5.25" White In-Wall Center Channel Speaker

Model #: 255c-RT
Polk Audio
At a Glance
The Vanishing Series 255c-RT is the centerpiece of a world-class stealth home theater. Paintable to match any décor, this in-wall center channel speaker blends in perfectly with its surroundings. Anchoring all the action without attracting attention, the 255c-RT ensures all you see is screen, and all you hear is dynamic, crystal clear sound.
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Get to know this product.

  • High performance audio from an in-wall center speaker designed for a flush fit with your wall
  • Silk dome tweeters set in a 15° swivel housing provide direct high frequency control, excellent off-axis imaging and more placement flexibility
  • Innovative features and patented Polk Audio technology in a discrete, easy-to-install package
  • Timbre-matched to the RTiA Series


The unique, wafer-thin grille is magnetically secured to deliver nearly transparent, ultra-small perfs and dynamic, unimpeded sound.

Power Port®

Patented bass venting design smoothly transitions air flow, eliminating turbulence and distortion, for deeper, more efficient bass impact.


Compatible with Polk Audio RTi speakers for seamless blending between traditional and built-in speaker systems.

Reflective Room Compensation

Lower tweeter levels offset reflective surfaces, cutting the level in the exact 4-5kHz band where reflectivity destroys sound quality.

Distance Toggle

Crossover adjustments flatten response bumps caused by nearby walls, reducing “boominess” for more lifelike sound from any position.

Simple Setup

Perfect Fit templates, a precision flange, available pre-construction brackets and the patented Rotating Cam system ensure secure, vibration-free installation.

Useful Documents


Connector Type:Gold-Plated Heavy Duty Spring Loaded


Tweeter Composition:Polymer Dome
Woofer Composition: Polypropylene Cone
Driver Component Size:5.25" x 2


Mount Depth:3.25


Sold As:Each


Sensitivity:90 dB
Speaker Type:In-Wall Speaker
Frequency Response:30 Hz - 27,000 Hz




Total Pieces1


Included Accessories(1) Sheer Grille - White
Optional Accessories(1) PB LCiC - Pre-Construction Bracket - Sold Separate

Shipping Cartons

Carton 16.25" (15.88 cm) h x 11.25" (28.58 cm) w x 17" (43.18 cm) d - 9 lbs (4.08 kg)


Quantity Included1
AvailabilityUS; Internationally
Depth3.875" (9.84 cm)
Weight6.6 lbs (2.99 kg)
Driver Enclosure TypePowerPort Bass Vented
Driver Complement(2) 5.25" (13.34 cm) d (Round) Dynamic Balance Mineral Composite Polypropylene Cone with Rubber Surround Mid/Woofer - Mid/Woofer; (1) 1" (2.54 cm) d (Round) Dynamic Balance Silk Polymer Composite Dome Tweeter - Tweeter
Grille Dimensions9.31" (23.65 cm) h x 14.81" (37.62 cm) w

In-Wall Mount

Available OrientationsHorizontal
Dimensions7.625" (19.37 cm) h x 13.125" (33.34 cm) w
Clearnace Required for Mounting Dogs (add to each side of cutout)3.375" (8.57 cm)

Audio Quality

Total Frequency Response30 Hz → 27,000 Hz
Nominal Impedance8 ohms
Sensitivity (1 watt @ 1 meter)90 dB
Lower and Upper -3dB Limits50 Hz → 25,000 Hz


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

External Amplifier

Recommended Amplifier Power Per Channel10 watts → 150 watts

Misc. Specs

Product Weight (lbs.)8.7
Frequency Response30Hz - 27kHz
Enclosure MaterialPolypropylene
Color Finish NameWhite
Outdoor ApprovedNo
Manufacturer WarrantyLimited Lifetime
Bi Amp InputsNo
Input Power Range10-150 Watts
Speaker Connector TypeSpring Clips
RMS Power Handling (Watts)150
Enclosure TypeBass Reflex
Impedance8 ohms
Maximum Power Handling (Watts)150
Number of Speakers1
Speaker TypeCenter Channel Speakers
Depth (in.)3.75
Height (in.)9.31
Midrange CompositionMineral-Filled Polypropylene Cone
Width (in.)14.81
Woofer Size5.25
WarningProposition 65 Warning for California Residents