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Polk Audio 625-RT

In-wall speaker

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Our take on the Polk Audio 625-RT

by Marshall Chase
Polk Audio

A great in-wall speaker can be hard to find
You'll love the sound of the Polk 625-RT. But its looks may be tough to describe, because this in-wall speaker will simply fade into your wall. Like the rest of the Vanishing RT family the 625-RT uses a paintable Sheer-Grille™. When you have friends over, they may not even know it's there until you fire it up. Use a pair for a stealthy stereo setup, or as your front left and right speakers in a décor-friendly home theater.

A great in-wall speaker really stands out
When it comes to sound the 625-RT isn't a wall flower. Its 6-1/2" woofer and 3/4" pivoting silk-dome tweeter deliver a one-two punch of solid bass and detailed highs. These drivers disperse crisp sound throughout the room thanks to careful engineering and construction along with Polk's Dynamic Balance technology. So you'll hear a film actor speak as if they were in the room. And you'll float on a cloud of your favorite music. But when your system is silent your speakers are cloaked in your décor.

A great in-wall speaker does well in school
Polk engineers and a major university tested the RT speakers with lasers to help eliminate unwanted resonances. The result is fine tuning you can hear. The 625-RT can be part of a superb system. Build one with speakers from the RT line for outstanding home theater sound and music. Or add the voice-matched, free-standing RTi speakers for a great gathering of scholars.

An optional in-wall bracket is recommended for installing the 625RT in a new home under 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 50-23,000 Hz (-3dB)
  • 3/4" pivoting silk/polymer dome tweeter
  • 6-1/2" Dynamic Balance® woofer
  • handles up to 100 watts
  • sensitivity 89 dB
  • 8-ohm impedance
  • paintable Sheer-Grille™ for stealth installation
  • cutout: 7-1/4"W, 12-3/4"H
  • mounting depth: 3"
  • lifetime warranty

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

Features and Specs
Enclosure Type In-wall
Video Shielded No
Tweeter Dome
Midrange Size ---
Woofer Size 6.5
Woofer Composition Polymer composite
Woofer Surround Rubber
Power Range (Watts) 20-100
Sensitivity 89 dB
Impedance (Ohms) 8
Frequency Response 50-23kHz
Connector Type Spring post
Bi-Amp Inputs No
Parts Warranty Lifetime
Labor Warranty Lifetime
Product Research
What's in the box?

Download owner's manual

  • Rectangular in-wall 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-Wall Loudspeakers: The Polk Audio Vanishing Series 625-RT in-wall 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 wall. 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
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-wall loudspeaker.

Woofer: The 625-RT in-wall 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.

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 (3500-6000Hz) where room acoustics most often interfere with performance. The switch has two settings:

  • Filter 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 "Filter" 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 in-wall 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-wall speaker is 35Hz to 25kHz, and the -3dB frequency response is 50 to 23kHz.

Infinite Enclosure Design

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

Wafer-Thin Sheer-Grille: The Polk Audio Vanishing Series in-wall 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 wall. 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 625-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-wall loudspeaker as in-wall 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 wall.

Installation: The 625-RT can be installed in new or existing construction:

  • Existing Construction: In existing walls, 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-wall retro-fitting.

Dimensions:

In-Wall Dimensions Model # 625-RT
Overall Dimensions (with grille) Width = 8.875"
Height = 14.375"
Cutout Dimensions Width = 7.25"
Height = 12.75"
Speaker Depth Depth = 3.5"
Mounting Depth (using 1/2" drywall) Depth = 3.0"
 
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Polk Audio 625-RT Reviews

Average Customer Review:

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Filter by rating:
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.
Pros:
Great sound quality for the price Easy install Clean look
Cons:
None
Was this review helpful?    Yes | No
 
4 out of 5

nice

Written By Rob, Cincinnati, OH on Friday, March 18, 2011
 
I have these speakers set up in a 5.1 as the fronts and backs. The center is a 265
RT. They sound nice and have very clear definition and detail. There is good
representation of mids and highs. There is plenty of richness in the mid-low
range from the woofers. Bass is puny but you know you're runnin a sub with these
dudes anyway. I would be lying if I said they were the best sounding speakers I
ever heard but for me it is a great value for a very nice speaker that
disappears into the wall.
8 out of 8 people found this helpful
Was this review helpful?    Yes | No
 

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For a more in-depth review and enhanced detailed information on the Polk Audio 625-RT, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107625RT/Polk-Audio-625-RT.html ).

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