Polk Audio 70-RT
Our take on the Polk Audio 70-RT by Crutchfield's Marshall Chase
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.
- 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
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
Polk RT 70s or easy to install saved hundreds by being able to install myself
Mark, El Dorado Hls , CA
Polk Audio 70-RT Reviews
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Features and Specs
|Quantity in Package||Single|
|Woofer Size||5 x 7|
|Power Range (Watts)||10-125|
|Connector Type||Spring posts|
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.
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.
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.
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 =
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
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Why did you buy this?
Sales reps recommendatio [ jonathan Nov 04, 2017 ]
Fit unique installation application better than any other speaker I could find. Sale price. Polk Quality. [ Carlos Apr 27, 2017 ]
Sale and reveiws [ Jeffrey Apr 25, 2017 ]
have a Denon ATMOS receiver and want to take advantage for movie watching. Have had great experience with Polk through the years. [ Thomas Apr 23, 2017 ]
I researched many speakers, and these for money will give me the best bang for the buck. The 5 X 7 woofers offer a better, tighter bass response than most 6.5 inch speakers I have heard. I have used Polk in several other houses and have always had great results. [ Brian Mar 18, 2017 ]
I like the sound of the Polk speakers I have installed and I wanted a bit more power than the smaller ceiling speakers. [ Paul Nov 30, 2016 ]
open floor plan in new house so had to go with in ceiling surrounds [ Jeffery Aug 24, 2016 ]
They were on sale [ HECTOR Aug 10, 2016 ]
combination of price point, form factor, quality and reviews [ Kent Jul 03, 2016 ]
3 questions already asked
1 answer I have an onkyo AV receiver HT-R550 that I purchased from crutchfield a few years back now and is still running real good. I would like to add ceiling speakers to the system for house music that I can either listen to or rock to. The house isn't huge so I was thinking 1 speaker per room which would position the speakers no more then 20 feet apart from each other. The other thing I would like to do is add a outside speaker to total 4 for the "b" side of the stereo system. Will these polk 70-RT's work well in this configuration? [ Chris Dec 17, 2017 ]
Actually, no; they would not. For single speaker mounts, it's best to use "stereo input" speakers so you'll still get both the left & right channels of audio from the single mounting location. For multi-room distributed audio systems, I highly recommend contacting the Crutchfield A/V Design Group: https://www.crutchfield.com/Institutional/diy.aspx This specially trained group of advisors can help design your multi-room system and recommend the specific components and cabling you'll need to get the performance and capabilities you require in each location. [ Ryan Dec 27, 2017 ] Staff
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 ]
The price is per single speaker. [ Jeff Dec 16, 2013 ] Staff
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