Our take on the Polk Audio 620-RT

by Marshall Chase
Polk Audio

Your home theater proposal got the "green light" but free-standing surround speakers were given the kibosh by a major stakeholder. Don't despair. Grab a pair of the Polk Audio 620-RT speakers. They install discreetly overhead, so you can keep your surround sound speakers out of sight or add music to rooms where conventional speakers just won't cut it.

Great quality + a vanishing profile = consensus
The 620-RT speakers uses a 6-1/2" woofer and a 3/4" pivoting silk-polymer dome tweeter for outstanding lifelike sound. Polk's patented port design delivers full range so you'll sacrifice nothing but an obtrusive outline. Paintable magnetic speaker grilles fit flush in the ceiling. The only time you'll be aware of these 'RTs is when you hear the whoosh of a jet engine overhead or shouts from behind you from a favorite film soundtrack.

Might as well invite the whole family over
Complete your system with other members of Polk's Vanishing RT series of speakers. You may also want to peruse their renowned, sonically matching RTi speakers. Build a home theater that will thrill and delight for years to come.

An optional in-wall bracket is recommended for installing the 620-RT speaker in a home with new construction.

Got wire?
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Shop our selection of in-wall speaker wire.


  • sold individually
  • frequency response 52-23,000 Hz (-3dB)
  • 3/4" pivoting silk/polymer dome tweeter
  • 6-1/2" Dynamic Balance® woofer
  • Infinite Baffle Tuning for improved bass response
  • handles up to 100 watts
  • sensitivity 89 dB
  • 8-ohm impedance
  • paintable Sheer-Grille™ for stealth installation
  • cutout: 8-3/16" diameter
  • mounting depth: 4-1/4"
  • lifetime warranty

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Enclosure Type
Video Shielded
Midrange Size
Woofer Size
Woofer Composition
Polymer composite
Woofer Surround
Power Range (Watts)
89 dB
Impedance (Ohms)
Frequency Response
Connector Type
Spring posts
Bi-Amp Inputs
Parts Warranty
Labor Warranty
Product Research
What's in the box?

Download owner's manual

  • Round in-ceiling speaker
  • White metal grille
  • Mounting template
  • Owner's Manual
  • Sheer-Grille Painting instructions
  • Online Registration Card
  • Polk Audio product brochure

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Vanishing Series In-Ceiling Loudspeakers: The Polk Audio Vanishing Series 620-RT in-ceiling loudspeaker features a precision-engineered, minimally flanged design. Polk's exclusive Sheer-Grille protrudes only 7mm from its surroundings, and installs virtually-flush in your ceiling. Mounting the speaker is simple with a one-cut, drop-in installation and the rotating cam stabilizing system. The speaker provides superior high-performance sound from its 6.5" woofer and aimable 0.75" tweeter with Reflective Room Compensation control.

Driver Technology
Infinite Enclosure Design
Mounting Options

Driver Technology

Dynamic Balance Technology: Laser-imaging technology allows Polk Audio engineers to see the entire vibrating surface of a driver and tweeter. This allows the engineers to actually see performance-robbing distortion develop on the speaker cone. Using this data, they can determine the Dynamic Balance of their high-tech materials, and alter the geometry and construction of the speaker to effectively tune out the offending resonance. Exclusive Dynamic Balance Composite Material Technology delivers sound that is effortlessly clean and clear, even at lifelike volume levels.

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-ceiling loudspeaker.

Polymer Composite Woofer: The 620-RT in-ceiling loudspeaker employs a 6.5" Dynamic Balance polymer composite cone woofer with a rubber surround for a smooth, consistent frequency response. The driver features a lightweight, strong composite basket that works in conjunction with Klippel Optimization to keep moving parts in rigid alignment while further damping performance-robbing resonances.

Silk Dome Tweeter: The speaker employs a 0.75" Dynamic Balance silk polymer composite dome tweeter for crisp, clear imaging. The high-performance tweeter features a 15° swivel housing, for more direct high frequency control, excellent off-axis imaging and more placement flexibility.

Timbre-Matched: The Polk Audio Vanishing Series in-ceiling loudspeakers are 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-ceiling speaker is 35Hz to 25kHz, and the -3dB frequency response is 52 to 23kHz.

Infinite Enclosure Design

Infinite Baffle Tuning: Infinite Baffle Tuning uses the virtual enclosure of the in-ceiling space for deep bass response and superior overall sound.

Wafer-Thin Sheer-Grille: The Polk Audio Vanishing Series in-ceiling speakers feature 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: When painting the grille, it is highly recommend that you use a can of spray paint matched to the color of the surrounding ceiling. Brushes or rollers should not be used to paint the grille, as this will clog the perf holes.


Gold-Plated Spring-Loaded Posts: The 620-RT has a pair of gold-plated spring-loaded binding posts that can accept single banana plugs, pin connectors, or bare wire up to 12-gauge.

Mounting Options

Applications: You can use the Polk Audio Vanishing Series in-ceiling loudspeaker as in-ceiling rear surrounds to complete an RTi Series speaker system, or for superior dynamics in practically invisible multi-zone music systems.

Rotating Cam System: The speaker utilizes a rotating cam system to ensure a secure, vibration-free installation. There are six rotating cams to hold the speaker securely to the ceiling.

Installation: The 620-RT can be installed in new or existing construction:

  • Existing Construction: In existing ceilings, use the included cardboard template for one-cut, drop-in simplicity.
  • New Construction: Pre-construction brackets (sold separately) are available for new-build or open-ceiling retro-fitting.


in-ceiling Dimensions Model # 620-RT
Overall Dimensions Frame Diameter: 8.915"
Grille Diameter: 9.589"
Mounting Depth: 4.6875"
Cutout Dimensions (using 1/2" drywall) Cutout Diameter: 7.904"
Mounting Depth: 4.1875"
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Polk Audio 620-RT Reviews

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4 out of 5

620 rt

Written By Pete, NY on Monday, April 14, 2014
Crutchfield Customer Review (What's this?)
For the price they are great fills the kitchen very well
Great sound compared to high end price speakers
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5 out of 5

Great sound

Written By Ben I, Central Florida on Saturday, December 21, 2013
Crutchfield Customer Review (What's this?)
I installed speakers in ceiling sound is great and look is wonderful, speakers do vanish.
Sound is so much better than last speakers, Home theather has come to life.
I installed these myself, I do not recommend a beginner doing it.
1 out of 1 people found this helpful
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5 out of 5

Solid speaker

Written By SurroundSound, Portland, OR on Tuesday, December 17, 2013
Crutchfield Customer Review (What's this?)
We purchased the 620-RT for front right/left/center speakers use in a pre-wired room. The 620-RT is simple to install and the sound output is clean. The construction of the speaker itself is solid and an obvious step up from the cheaper RC60i's. We are using these for both music and theater and are very pleased with the performance. The magnetic "grill" cover makes for a nice low profile (flat) look too.
Solid construction of cones and magnets, easy install in ceiling and nice wire attachment posts, magnetic cover "grill"
1 out of 1 people found this helpful
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5 out of 5

Nice quality sound, easy install

Written By SK, Honolulu, HI on Saturday, November 16, 2013
Crutchfield Customer Review (What's this?)
I have bought two sets of these and the sound is great for small to mid-size rooms. Nice clean look and easy install. I have installed these both with and without the optional mounting brackets. The brackets are really only needed to show your drywall guys where to cut the holes, they do not help much for actual installation.
Great sound quality for the price Easy install Clean look
2 out of 2 people found this helpful
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5 out of 5

Polk ceiling speakers

Written By Ricardo R., Miami, FL on Monday, November 11, 2013
Crutchfield Customer Review (What's this?)
Great sound, it blends perfectly with the ceiling, much better surround result than I had before.
1 out of 1 people found this helpful
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1 question already asked

Should this be protected from Insulation? [ Donald  Jan 15, 2014 ]
10 answers
  • I will be installing these today. I will be building a small enclosure to protect from insulation, as I feel the speakers will preform better with he enclosure. [ Steve   Jan 19, 2014 ]
  • I do not think any 'isolation 'is needed. I just pushed back/cut out so that the insulation did not physically touch the speaker. [ DONALD S   Jan 18, 2014 ]
  • Hello Donald,I did purchase the Polk Audio 620-RT speakers form Crutchfield. I do was concerned about ceiling mount speakers. Speaking to a helpful Crutchfieldadviser, I was told to that I would have know problem with the insulation in the ceiling interfering with the speaker sound.Hope this helps Donald,Dan L [ DAN   Jan 17, 2014 ]
  • When I installed my speakers, my insulation had paper backing so it should present no problem, but if its blown in you will have a problem.The question is what kind of insulation do you have. [ BENJAMIN   Jan 16, 2014 ]
  • The wall that I put my speakers in didn't have insulation. They are interior walls. The speaker takes up all the room in the 3 1/2" space, so there isn't any room for insulation. I would like to add that you will probably need to add drywall screws to make the structure tight. My wall vibrated like crazy until I fastened the wall to the nearest 2x4s tightly. I am happy with their performance after that. Hope this helps [ DANIEL W   Jan 16, 2014 ]
  • Donald, my speakers are placed in a drop ceiling so I didn't have any insulation problems to deal with, but I don't feel that the insulation would hurt the speaker though. [ NATHAN D   Jan 16, 2014 ]
  • There is nothing in the installation manual about protecting the speaker from insulation and nothing is included in packing that could be used for protecting the speaker. I have boxed the area above the speaker and between ceiling beams with half inch plywood. I don't want the fiberglass insulation to contaminate the speaker and I don't want the speaker opening to allow outside air to infiltrate the air-conditioned space. [ DONALD   Jan 16, 2014 ]
  • I think it depends on the type of insulation (paneled or blown). I don't see a reason why the paneled insulation couldn't work. The blown insulation (loose fibers might be problematic). We installed our Polk speakers in the kitchen ceiling with NO insulation but the one thing I did notice is that the sound is very clearly heard in the bedroom above and having no insulation doesn't help matters. Just some things to think about...not really an "answer" however. [ DAVID   Jan 16, 2014 ]
  • When I installed the speakers, I made sure there was at least 6" of space around the speaker that was free of insulation or other items. I installed these in the ceiling. [ MIKE   Jan 16, 2014 ]
  • Insulation, will not bother the unit. it actually helps it. [ GEORGE C   Jan 16, 2014 ]

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