Polk Audio 255c-LS

In-wall center channel speaker

Item #: 107255CLS

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Answer to the center channel challenge

The center channel speaker is critical in any home theater system, yet it can be the hardest to place. Do you put it below the TV, or get a shelf for it, or what? The in-wall Polk 255c-LS is a great solution.

Big sound, no footprint

This in-wall center channel speaker is built to perform. Potent 5-1/4" woofers work with Polk's PowerPort® bass venting technology to deliver punchy lows. A 1" ring-radiator tweeter extends high-frequency response for incredible details and realistic imaging. You'll hear every breath of dialogue and every note of music. All of this from a center channel speaker that's out of sight, in more ways than one.

Sound-shaping controls

A wall distance toggle switch lets you compensate for boominess due to installation near a side wall. You also get a tweeter attenuation switch to help you get balanced sound in rooms with lots of reflective surfaces.

Bring the family

The Polk 255c-LS is timbre-matched to Polk's free-standing LSi M speakers. It can mingle with matching towers or bookshelves. Or it can join in harmony with other members of the "Vanishing" LS speaker family.

An optional in-wall bracket is recommended for installing the 255c-LS in-wall center channel speaker in a home with new construction.

Got wire?

Most speakers don't include any. Learn more about in-wall wiring at the Crutchfield Learning Center.
Shop our selection of in-wall speaker wire.

Product Highlights:

  • frequency response 44-29,000 Hz (-3dB)
  • 1" Dynamic Balance® ring radiator tweeter
  • dual 5-1/4" Dynamic Balance® woofers
  • handles up to 150 watts
  • sensitivity 91 dB
  • 8-ohm impedance
  • timbre matched to Polk LSi series speakers
  • PowerPort® technology for punchier bass
  • paintable Sheer-Grille™ for stealth installation
  • cutout: 13-1/8"W x 7-5/8"H
  • mounting depth: 3-13/16"
  • warranty: limited lifetime
  • Our 60-day money-back guarantee

Your home theater's most important speaker

The center channel speaker is the workhorse in a home theater system. It has to reproduce clear dialogue and special effects that keep your eyes and ears glued to the movie action. A high-quality center speaker is a great investment for any surround sound setup. Try to choose one that's as closely matched as possible to your front right and left speakers, so that as sound moves across the front stage, it stays seamlessly realistic.

Hands-on research

What's in the box?

Download owner's manual

  • In-wall center-channel loudspeaker
  • White metal grille
  • Mounting template
  • Owner's Manual
  • "Fitting the Grille to the Wall" label (attached to bag)
  • Online Registration Card
  • Polk Audio product brochure

Features and Specs

Enclosure In-wall
Tweeter Ring radiator
Midrange size (inches) ---
Woofer size (inches) 5-1/4
Connector Type Spring post
Power Range 10-150
Sensitivity 91 dB
Impedance (Ohms) 8
Frequency Response 44-29k Hz
Height (inches) ---
Width (inches) ---
Depth (inches) ---
Weight 6.86 lbs
Parts Warranty Lifetime
Labor Warranty Lifetime

Product Research

Features
Connections
Mounting Options
Dimensions

Features

Vanishing Series In-Wall Speakers: The Polk Audio Vanishing Series in-wall loudspeakers feature 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 loudspeakers offer a one-cut, drop-in installation and rotating cam stabilizing system. The Vanishing LS series in-wall speakers are timbre-matched to Polk Audio's flagship LSi and LSiM series loudspeakers for seamless blending from speaker to speaker when you're building a speaker system.

Dual Midranges: This Polk Audio Vanishing Series 255c-LS in-wall center-channel loudspeaker employs two 5-1/4" Dynamic Balance aerated polypropylene cone midrange drivers with rubber surrounds for a smooth, consistent frequency response. The aerated polypropylene cones are 20% lighter than conventional polypropylene, and 35% lighter than aluminum, to give you clear midrange, punchy bass, and high efficiency. Polk Audio's patented Dynamic Balance technology eliminates unwanted resonances.

Ring Radiator Tweeter: The 255c-LS employs a 1" Dynamic Balance ring radiator tweeter for detailed highs and superb imaging. This high-performance tweeter features a 15° swivel housing, for more direct high frequency control, excellent off-axis imaging and more placement flexibility.

Reflective Room Compensation Control: The Reflective Room Compensation Switch, conveniently located on the front panel, allows you to digitally compensate for harsh reflective surfaces, such as smooth walls, glass windows, and hardwood floors. The filter doesn't merely reduce high frequencies, it simply cuts the level only in the 4-5kHz range where room acoustics most often interfere with performance. The switch is labeled "Tweeter" with two positions: out (normal) and in (filter).

Frequency Response: The overall frequency response of the in-wall center-channel loudspeaker is 30Hz to 33kHz, and the -3dB frequency response is 44 to 29kHz.

Sheer-Grille: The 255c-LS features Polk Audio's exclusive wafer-thin Sheer-Grille, a magnetically-secured metal 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 perforations, and is acoustically inert, for dynamic, unimpeded sound and more uniform coverage, even in larger rooms. The grille's dimensions are 14-3/4" x 9-1/4".

Connections

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- or dual-banana plugs, or pin connectors.

Mounting Options

Applications: You can use the Polk Audio Vanishing Series 255c-LS in-wall center-channel loudspeaker to complete a system of traditional loudspeakers or in-wall speakers, by adding an inconspicuous center-channel speaker.

Note: The speaker isn't recommended for installation in high-moisture locations.

Placement: The in-wall center-channel speaker is designed to be installed above or below your flat-panel television. It should be installed as close to ear level as possible. If the speaker needs to be installed lower or higher than ear level, you should aim the tweeter accordingly.

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. The 255c-LS has 6 rotating cams to hold the speaker in place. The cams can be tightened from the front panel with a Phillips-head screwdriver.

Installation: The 255c-LS 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 (6 rotating cams).
  • New Construction: The optional PB LCic pre-construction brackets should be used for new-build or open-wall retro-fitting.

Dimensions

Overall Dimensions (with grille) Width = 14-3/4"
Height = 9-1/4"
Depth=4-1/16"
Cutout Dimensions Width = 13-1/8"
Height = 7-5/8"
Mounting Depth (behind 1/2" drywall) Depth = 3.75"
Weight 6.86 lbs.

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Polk Audio 255c-LS Reviews

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Expensive but worth the $

Written By Marcus, South Fla on Thursday, February 20, 2014

Have a current Yamaha 90x7.1 receiver driving all Polk speakers. My left ,right and center were all Polk 65 RT. At high volumes the 65 RT clearly became muddled and struggled to process clean vocals combined with dynamic soundtracks so many action movies produce. Lower volumes were presented with much improvement but I knew there could be better. I waited about a month or so to see if things got better after initial break in period. Then I decided to invest in the 255c-LS....immediately the dual 5 1/4 drivers and tweeter made a vast improvement easily discernible to even my teenage kids. Conversations, loud effects, soundtracks all have a separation on apparent with the 65 RT. Very pleased with results.

Pros: Separation and clarity needed for a dedicated center channel

Cons: Price, price, price

Get everything you’ll need to enjoy your new Polk Audio 255c-LS

UL-listed speaker wire is designed to be run through walls and is building code compliant.
Install these before your drywall goes up to mark your speaker locations for your builder, so you won't need to cut holes later.
Have your speakers installed by qualified professionals.
Set the volume level in your remote location without going back and forth from room to room.
A speaker selector will let multiple pairs of speakers act like just one to your receiver.
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