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Polk Audio 70-RT

In-ceiling speaker

12 Reviews | 2 questions - 6 answers

Item #: 10770RT

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Our take on the Polk Audio 70-RT

This great-sounding speaker hides in plain sight
Polk's Vanishing Series 70-RT speakers stand out audibly — not visually. Your favorite rooms don't have to be silent any longer just because you can't or don't want to put free-standing speakers there.

This great-sounding speaker hides in plain sight
Polk's Vanishing Series 70-RT speakers stand out audibly — not visually. Your favorite rooms don't have to be silent any longer just because you can't or don't want to put free-standing speakers there.

Polk's clever design yields big bass from a smaller space
Polk ingenuity fills their Vanishing Series speakers to overflowing with clear, full-range sound. Each model has three drivers — a tweeter, a mid-range and a woofer — packed into a smaller than an average space. Dual port bandpass technology ensures that you'll get deeper sound with a diminutive-sized speaker. Their paintable, seamless-profile magnetic grilles make it simple for these speakers to fit perfectly into your surroundings.

Might as well invite the whole speaker family over
Get two 70-RTs to listen to music in the den, or add more for a great sounding home theater. They're also a pretty close sonic match to Polk's renowned free-standing RTi speakers. Any way you choose, you'll get harmonious results.

An optional in-ceiling bracket is recommended for installing the 70-RT speaker in a home with new construction.

Got wire?
Most speakers don't include any. Learn more about in-wall wiring.
Shop our selection of in-wall speaker wire.

These speakers were easy to install and sound amazing! I love them and they help make my surrounnd system sound terrific.

HenryN, California

What's in the Box:

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

Product Highlights:

  • sold individually
  • frequency response 48-25,000 Hz (-3dB)
  • three-way speaker design includes:
    • 3/4" silk/polymer dome tweeter
    • 2-1/2" midrange speaker
    • 5" x 7" Dynamic Balance® woofer
  • dual port bandpass enclosure for better bass response
  • selectable tweeter level switch for more flexible speaker placement
  • handles up to 125 watts RMS
  • sensitivity 90 dB
  • 8-ohm impedance
  • paintable Sheer-Grille™ for stealth installation
  • cutout: 6-1/2" diameter
  • mounting depth: 8-1/2"
  • lifetime warranty

Polk Audio 70-RT Reviews

Average Customer Review:

12 Reviews

Overkill for rear surround

Written by: jpw from California on November 29, 2015

Crutchfield Customer Review (What's this?)

I purchased these in spite of advice to use smaller, cheaper speakers for rear surround. I should have heeded the advice. These seem like perfectly fine speakers. Can you resist buying what's appropriate when you could buy fancy? I couldn't. I'll take consolation when watching movie scenes featuring bullets whizzing by. The rest of the time I'll forget they're there.



Polk Audio 70RT

Written by: HenryN from California on October 25, 2015

Crutchfield Customer Review (What's this?)

These speakers were easy to install and sound amazing! I love them and they help make my surrounnd system sound terrific.

Pros: Easy install template, great rich sound.

Cons: none

Polk Audio 70-RT

Written by: Anonymous from Milwaukee, WI on March 17, 2015

Crutchfield Customer Review (What's this?)

Easy to install and a great sound for the price.



Polk Audio 70-RT

Written by: Anonymous from Illinois on January 7, 2015

Crutchfield Customer Review (What's this?)

Great Sound



Great sound

Written by: Kody from Houston, TX on March 6, 2014

Crutchfield Customer Review (What's this?)

This a great speaker. I worked with Crutchfield to set up what I needed and it sound awesome. Great highs and mids. I am using with denon avr 887.

Pros: Great speaker at a great price. Easy install comes with templet you need for mounting

Cons: I don't have any cons could not be happier with purchase. Or support. Buyer for life

Polk Audio 70-RT

Written by: bobby from oregon on February 24, 2014

Crutchfield Customer Review (What's this?)

Awesome clarity love them



New media room

Written by: Michael B from California on February 5, 2014

Crutchfield Customer Review (What's this?)

Easy to install and sound great, would highly recommend to others.

Pros: Easy to install, great sounding, used for front and center channel and paired with 80F/X-RT for surround and PSW-111 for bass.

Cons: None

good 3 way speakers

Written by: Anonymous from Gilbert on December 16, 2013

Crutchfield Customer Review (What's this?)

I endorse the 70-RT. it worked properly for my 5+1 config.



Great Surrounds

Written by: Jeff from Kansas City on October 10, 2013

Crutchfield Customer Review (What's this?)

Installed four of these about a month ago in the basement ceiling. They are coupled to a Pioneer Elite SC-71 receiver with Polk RTiA7 fronts, a Blackstone TL3 center, and a DSWpro440wi and it sounds fantastic!! The supplied templates made it easy to install and my wife is happy too because the surrounds are out of the way.

Pros: Sounds great, magnetic covers fit perfect

Cons: None so far

Awesome Sound

Written by: JimH from Carmel, IN on August 18, 2013

Crutchfield Customer Review (What's this?)

Awesome sound. Much better than the Bose AM10 System they replaced.




Written by: Polk Lover from Missouri on February 14, 2013

Crutchfield Customer Review (What's this?)

I have been a long time loyal Polk follower and have always been pleased with them, so this is very hard to write. When doing a recent kitchen remodel, I decided to replace the old 'builder grade' 6 1/2" ceiling speakers we had with these Polks. My hope was that I would be so blown away with them that I would replace all of the remaining speakers in the rest of our rooms for our whole house audio system (10 additional speakers). First of all, these were slightly smaller than the previous 6 1/2" speakers so the tabs wouldn't catch. I was able to fabricate a spacer ring to make them work (this may not be any fault of Polk, but do measure your cutout first if replacing existing speakers.) Next, these Polks are DEEP. Yes, I read the specs before ordering and new the dimensions, but I did have to make some accommodations that 'normal' flat-lying ceiling speakers wouldn't have to have. After spending an entire afternoon installing them, I was severely disappointed in the sound. I drive the whole house audio with a high end Denon so I don't believe that the source is the problem. We don't crank the music; we just enjoy nice background music. The 10 year old builder-grade speakers sounded better. They are definitely not worth the $ to finish out the house.

Pros: They do look nice!

Cons: Sound is poor. Deep installation depth. Expensive.

Polk Audio 70-RT

Written by: Brian T from Easthampton ma on March 21, 2012

Crutchfield Customer Review (What's this?)

Sounds great for the front LF CTR RF surround .

Pros: Clean look.



Hands-on research

What's in the box?

Download the Polk Audio 70-RT manual

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

Features and Specs

Enclosure Type In-ceiling
Video Shielded No
Tweeter Dome
Midrange Size 2.5
Woofer Size 5 x 7
Woofer Composition Polypropylene
Woofer Surround Rubber
Power Range (Watts) 10-125
Sensitivity 90 dB
Impedance (Ohms) 8
Frequency Response 48-25kHz
Connector Type Spring posts
Bi-Amp Inputs No
Parts Warranty Lifetime
Labor Warranty Lifetime

Product Research

Vanishing Series In-Ceiling Loudspeakers: The Polk Audio Vanishing Series 70-RT is a high performance in-ceiling loudspeaker designed to bring high-quality music to any room or transitional space in your home. It's Polk Audio's smallest, most "invisible" full-range in-ceiling speaker. The Polk Audio 70-RT's lightweight polypropylene cone & sensitive silk dome tweeter can be angled for superior off-axis performance. The innovative addition of the woofer driver behind the main speaker adds depth & dynamics to this compact in-ceiling speaker. The in-ceiling speaker's Reflective Room Compensation Switch digitally compensates for "reflective" rooms, giving you placement flexibility.

Driver Technology
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.

Full-Range 3-Way Driver Array: The Vanishing Series 70-RT in-ceiling loudspeaker employs a new innovative patent-pending design from Polk that's like having a full-range, full-size speaker in a small inset lighting fixture. To do this, Polk designed a deep well and mounted a 'Cassini Oval' woofer above & behind the main driver array. By adding a woofer for low frequency response, the midrange & tweeter is freed up to provide more efficient detail. This innovative deep diagonal positioning allows the 70-RT cutout to be just 6.5" in diameter. This full-range 3-way driver array results in the kind of broad coverage and big performance usually achieved only with bigger box speakers. The 70-RT in-ceiling loudspeaker features the following three drivers.

  • Tweeter: One 0.75" Dynamic Balance silk/polymer dome tweeter
  • Midrange: One 2.5" Dynamic Balance mineral filled polypropylene cone.
  • Woofer: One 5"x7"  Dynamic Balance 'Cassini Oval' mineral filled polypropylene woofer.

Reflective Room (Tweeter) Compensation Control: An easily accessible Reflective Room (Tweeter) Compensation switch allows you to make detailed adjustments to optimize the sound for any installation. The switch can be used to digitally compensate for harsh reflective surfaces. The switch doesn't merely reduce high frequencies, it actually allows you to "notch-out" a specific area of the spectrum (3,500-6,000Hz) where room acoustics most often interfere with performance. The switch has two settings:

  • Reflective 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 "Reflective" 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 RT in-ceiling loudspeakers have been timbre-matched with Polk's RTi Series loudspeakers. Timbre-matching with the same internal components, and the same lightweight polymer composite cone material, insures utterly 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 34Hz to 27kHz, and the -3dB frequency response is 48 to 25kHz.

Enclosure Design

Dual Bandpass Ports: Bandpass Ports are the way to go when you want high efficiency in small enclosures. The Vanishing Series in-ceiling speaker employs dual Bandpass Bass Ports, smoothly funneling the angled woofer's detailed low-frequencies down around the midrange and tweeter array. The port design eliminates "chuffing", so the small, practically invisible in-ceiling speakers achieve superior full-range blending and broad coverage with surprisingly deep bass.

15° Angled Baffle: A 15° angled baffle allows you to direct the mids & highs for the particular application; simply by rotate the speaker in the desired directions and tighten down the rotating cams.

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 70-RT has a gold-plated pair of spring-loaded binding posts that can accept up to 12-gauge wire, single banana plugs, or pin connectors.

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 four rotating cams to hold the speaker securely to the ceiling.

Note: There is an eyebolt on the back of the speaker that can be used for an extra measure of installations security.

Installation: The 70-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 (107PB50, sold separately) are available for new-build or open-ceiling retro-fitting.


In-Ceiling Dimensions Model # 70-RT
Overall Dimensions (with grille) Diameter = 8.125"
Depth = 8.625"
Cutout Dimensions Diameter = 6.5"
Total Mounting Depth Depth = 8.5"
Mounting Depth (using 1/2 drywall) Depth = 8"

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 verify what’s in the box, 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.

Q & A

Customer Q&A

2 questions already asked

Yes, these can be slightly angled. [ Riley  Sep 19, 2015 ]
Yes these do aim straight down - there is an angle to the main driver but it is funneled down a tube and projects the sound evenly out of the front of the speaker with the midrange and tweeter - the speaker is well balanced and sounds great. I would suggest you download the user manual and check out the line diagrams on page 4 - it will show you how the speaker is configured. [ Christopher  Sep 18, 2015 ]
They are placed angular behind the face plate aiming down. If you are planning for front three then voice is modular and perfect as per placement. But if placed one or two odd in corners then you would definitely hear better facing down [ PANKAJ  Sep 18, 2015 ]
They have a little bit of an angle. [ Nathan  Sep 18, 2015 ]
They aim straight down once installed. The electronics and rear housing do sit on an angle. They work and sound great in my 5.2.4 Atmos setup. [ Mark  Sep 18, 2015 ]

Looking for more? Check out the next model in this lineup.

Polk Audio 90-RT each

Polk Audio 90-RT


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$262.49 After $87.50 Instant Savings

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Bigger speakers for fuller sound

The Polk Audio 90-RT offers these features:

3-1/4" midrange

6" x 9" woofer

frequency response: 30-27,000 Hz (-3dB)