1.888.955.6000
crutchfield.com
Crutchfield

Polk Audio 70-RT

In-ceiling speaker

Zoom
  • Polk Audio 70-RT

    Front

  • Polk Audio 70-RT

    Back

 

Our take on the Polk Audio 70-RT

by Marshall Chase
Polk Audio

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 at the Crutchfield Learning Center.
Shop our selection of in-wall speaker wire.

See more info on this item

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

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

Features and Specs
Enclosure Type
Loading...
In-ceiling
Video Shielded
Loading...
No
Tweeter
Loading...
Dome
Midrange Size
Loading...
2.5
Woofer Size
Loading...
5 x 7
Woofer Composition
Loading...
Polypropylene
Woofer Surround
Loading...
Rubber
Power Range (Watts)
Loading...
10-125
Sensitivity
Loading...
90 dB
Impedance (Ohms)
Loading...
8
Frequency Response
Loading...
48-25kHz
Connector Type
Loading...
Spring posts
Bi-Amp Inputs
Loading...
No
Parts Warranty
Loading...
Lifetime
Labor Warranty
Loading...
Lifetime
Product Research
What's in the box?

Download owner's manual

  • 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 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
Connections
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.

Connections

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.

Dimensions:

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"
 
Review this product
Great Gear Giveaway rewards card

Submit a review and then enter to win a $500 rewards card

Polk Audio 70-RT Reviews

Average Customer Review:

8 people say:

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left
Filter by rating:
5 out of 5

Great sound

Written By Kody, Houston, TX on Thursday, March 06, 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
Was this review helpful?    Yes | No
 
4 out of 5

Polk Audio 70-RT

Written By bobby, oregon on Monday, February 24, 2014
Crutchfield Customer Review (What's this?)
 
Awesome clarity love them
Was this review helpful?    Yes | No
 
5 out of 5

New media room

Written By Michael B, California on Wednesday, February 05, 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
Was this review helpful?    Yes | No
 
5 out of 5

good 3 way speakers

Written By Anonymous, Gilbert on Monday, December 16, 2013
Crutchfield Customer Review (What's this?)
 
I endorse the 70-RT. it worked properly for my 5+1 config.
Was this review helpful?    Yes | No
 
5 out of 5

Great Surrounds

Written By Jeff, Kansas City on Thursday, 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
Was this review helpful?    Yes | No
 
5 out of 5

Awesome Sound

Written By JimH, Carmel, IN on Sunday, August 18, 2013
Crutchfield Customer Review (What's this?)
 
Awesome sound. Much better than the Bose AM10 System they replaced.
Was this review helpful?    Yes | No
 
2 out of 5

Disappointed

Written By Polk Lover, Missouri on Thursday, 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.
3 out of 6 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

Polk Audio 70-RT

Written By Brian T, Easthampton ma on Wednesday, March 21, 2012
Crutchfield Customer Review (What's this?)
 
Sounds great for the front LF CTR RF surround .
Pros:
Clean look.
Was this review helpful?    Yes | No
 

1 question already asked

Is this a single speaker or does the box include a speaker pair? [ Richard  Dec 15, 2013 ]
1 answer
  • The price is per single speaker. [ Jeff Staff  Dec 16, 2013 ]

Add accessories for the Polk Audio 70-RT

UL-listed speaker wire is designed to be run through walls and is building code compliant. Most speakers don't include speaker wire. See all categories & accessories

AudioQuest FLX-14/2 14-Gauge 2-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
51 people say
Your Price: $129.99
Add to Cart
AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (250 feet)
2 people say
Your Price: $439.99
Add to Cart
AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
28 people say
Your Price: $99.99
Add to Cart
AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
7 people say
Your Price: $159.99
Add to Cart
Polk Audio PB-50 Pre-construction brackets for Polk 70-RT and 700-LS in-ceiling speakers (pair)
Your Price: $43.99
Add to Cart
Niles SVC100K Sliding stereo volume control with impedance magnification
Your Price: $129.99
Add to Cart
Niles VCS100K Stereo volume control with impedance magnification
4 people say
Your Price: $99.99
Add to Cart
Russound ALTx-2 Stereo volume control with impedance matching
Your Price: $39.99
Add to Cart
Russound ALTx-2D Stereo volume control with impedance matching and Decora®-style wall plate
2 people say
Your Price: $39.99
Add to Cart
Russound ALTX-WIRI-2D Electronic volume control with IR sensor and impedance magnification
Your Price: $159.00
Add to Cart
Niles SS-4 4-pair speaker selector
22 people say
Your Price: $129.99
Add to Cart
Niles SS-6 6-pair speaker selector
8 people say
Your Price: $174.99
Add to Cart
Russound SS-4.2 4-pair speaker selector
6 people say
Your Price: $119.00
Add to Cart
Russound SS-6.2 6-pair speaker selector
1 person says
Your Price: $159.00
Add to Cart
Niles SSVC-2 2-pair speaker selector with volume control
4 people say
Your Price: $249.99
Add to Cart
Niles SSVC-4 4-pair speaker selector with volume control
7 people say
Your Price: $399.99
Add to Cart
Niles SSVC-6 6-pair speaker selector with volume control
6 people say
Your Price: $474.99
Add to Cart
Russound SDB-2.1 2-pair speaker and source selector with volume control
1 person says
Your Price: $199.00
Add to Cart
Russound SDB-4.1 High-power 4-pair speaker selector with volume control
1 person says
Your Price: $399.99
Add to Cart
Russound SDB-6.1 High-power 6-pair speaker selector with volume control
Your Price: $499.99
Add to Cart
Niles VCS HUB8 8-speaker pair connecting block
6 people say
Your Price: $79.99
Add to Cart

Why choose SquareTrade?

The #1-Rated Protection Plan

Thousands of people have reviewed SquareTrade Protection Plans — and made us #1.

5-Day Service Guarantee & Free Shipping

We'll repair or replace your item in five business days or less after we've received it, or your plan is free. And, as always, we pay for all shipping.

Protection from Normal, Everyday Use

Repairing your average mechanical or electrical failure can cost as much as buying a new device. With SquareTrade, you're covered — including parts and labor.

For a more in-depth review and enhanced detailed information on the Polk Audio 70-RT, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_10770RT/Polk-Audio-70-RT.html ).

Find the gear that's right for you
 
Ask an expert
Your Crutchfield Advisor knows the gear inside and out.
Call 1.888.955.6000
Ask an expert

Compare with other Polk Audio models

  • Polk Audio 90-RT
  • Bigger speakers for fuller sound
  • 5 out of 5: In Stock
  • The Polk Audio 90-RT offers:
    • 3-1/4" midrange
    • 6" x 9" woofer
    • frequency response: 30-27,000 Hz (-3dB)
  • Add To Cart
    $349.99
    After $50.00 Price Break
  • Polk Audio 70-RT
  • in-ceiling speaker (Vanishing Series)
  • 4.5 out of 5: In Stock
    • The Polk Audio 70-RT offers:
      • 3/4" silk/polymer dome tweeter, 2-1/2" midrange and 5" x 7" woofer
      • frequency response 48-25,000 Hz (-3dB)
      • paintable Sheer-Grille™ for stealth installation
  • Add To Cart
    $249.99
  • Polk Audio 90-RT
  • in-ceiling speaker (Vanishing Series)
  • 5 out of 5: In Stock
    • The Polk Audio 90-RT offers:
      • 3/4" silk/polymer dome tweeter, 3-1/4" midrange and 6" x 9" woofer
      • frequency response 43-25,000 Hz (-3dB)
      • paintable Sheer-Grille™ for stealth installation
  • Add To Cart
    $349.99
    After $50.00 Price Break
You are here
  • Polk Audio 90-RT
  • Polk Audio 90-RT
  • Get details
  • $349.99
  • After $50.00 Price Break
  • Add To Cart