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Polk Audio Signature S20

Bookshelf speakers (Washed Black Walnut)

23 Reviews

Item # 107SIGS20

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C$449.99 pair

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Our take on the Polk Audio Signature S20

Polk's Signature S20 bookshelf speakers are an excellent choice for high-impact surround sound and detailed high-resolution stereo music. Their curved edges and sleek black or walnut finish make them an attractive addition to any room.

Rich home theater sound

Polk's Signature S20 bookshelf speakers are an excellent choice for high-impact surround sound and detailed high-resolution stereo music. Their curved edges and sleek black or walnut finish make them an attractive addition to any room.

Polk Signature S20 bookshelf speakers

Built for smooth sound

The S20s are made with high-quality materials for natural, low-distortion sound. Each cabinet houses a 1" high-resolution Terylene dome tweeter for clear, detailed highs and realistic reproduction of instruments and vocals. The highly efficient 6-1/2" Dynamic Balance® woofer is made of lightweight yet durable mica-reinforced polypropylene. Non-resonant MDF (Medium Density Fiberboard) cabinets and anti-diffraction magnetic grilles provide an acoustically inert structure for reduced sonic interference. Polk's exclusive Power Port technology adds bass impact.

Build a complete Signature system

Add more Polk Signature speakers for seamless surround sound.

Bookshelf speakers: Polk Signature S10 and Polk Signature S15
Center channel: Polk Signature S30 or Polk Signature S35
Floor-standing speakers: Polk Signature S50, Polk Signature S55, or Polk Signature S60

Round out the low end with a Polk powered subwoofer.

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Shop our selection of speaker wire.

Product Highlights:

  • frequency response: 39-40,000 Hz
  • sensitivity: 88 dB
  • 8-ohm impedance
  • handles up to 125 watts
  • 1" Terylene high-res dome tweeter
  • 6-1/2" mica-reinforced polypropylene Dynamic Balance® cone driver
  • Power Port® technology for better bass response
  • non-resonant MDF cabinet
  • 5-way gold-plated binding posts
  • anti-diffraction magnetic grilles for minimal sonic interference
  • 8-9/16"W x 14-3/4"H x 13-13/16"D
  • weight: 17 lbs.
  • warranty: 5 years
  • Our 60-day money-back guarantee

What's in the Box:

  • 2 Bookshelf loudspeakers
  • 2 Grilles (attached)
  • 8 Self-adhesive rubber feet
  • Owner's Manual
  • Online Product Registration

AMAZING SOUND QUALITY especially when you consider the price for this pair of Good looking and Great Sound Quality. Although I'm using them for surround sound I've tested them on a 2.0 stereo amp and they sound Very good. Good Low and high frequencies.

JULIO Silva, Kenmore, WA


Polk Audio Signature S20 Reviews

Average Customer Review(s):

(23 Reviews)

Polk Audio Signature S20

JULIO Silva from Kenmore, WA on 12/16/2018

Crutchfield Customer Review (What's this?)

AMAZING SOUND QUALITY especially when you consider the price for this pair of Good looking and Great Sound Quality. Although I'm using them for surround sound I've tested them on a 2.0 stereo amp and they sound Very good. Good Low and high frequencies.

Pros: Sound quality, cost, sound quality.

Cons: None to the moment

Polk signature

Carlos from San Diego, CA on 12/6/2018

Crutchfield Customer Review (What's this?)

Buen sonido, buen diseño, fácil de instalar, me gusto el color

Pros: Fácil de instalar, buen tamaño

Cons: Ningúno

Polk Audio Signature S20

Marcus from Tyrone, GA on 11/2/2018

Crutchfield Customer Review (What's this?)

These speakers are excellent and fit my home theater perfectly



Quality at a good price

Crutchfield customer from Bryan, TX on 9/17/2018

Crutchfield Customer Review (What's this?)

Great sounding speakers, ordered from scratch and dent and they were just like new at a lower price



great little speaker

jim from Louisville, KY on 9/16/2018

Crutchfield Customer Review (What's this?)

very good little speaker. I haven't bought any speakers in 20 years,I have always heard good things about Polk, but have never heard them. These are a perfect size for me.I a/b them with my vintage Advent 2 ways. the Polks require a bit more power, but have really crisp highs. I tried playing both at once and loved it so much I kept it that way



Value meets quality!

Trevor from Wyckoff, NJ on 8/24/2018

Crutchfield Customer Review (What's this?)

Hi guys. I am powering these with an 80W RMS Onkyo. Nothing special, and I am achieving some audiophile level quality tone from these budget "surrounds or bookshelf's" used as front speakers. Google the S20 and you will see a lot of people prefer these S20's in the signature series over some of the tower units. They just hit that magic sweet spot with the resonance of the cabinet, drivers, and crossover all working in unison.. The power-port does look a little cheesy, but I do believe it keeps the sound tight in conjunction with the stiffer mica-poly driver. Very clean sounding speakers. Have I heard speakers with better definition? Of course, but these are darn good for their size and especially for the money!! Not too many bookshelf's are going to have such a complete, linear, and full detailed sound as these. I recommend them for an office, or small family room without hesitation.

Pros: Good definition, great build quality, handsome (my opinion), good crossovers, no breakup or distortion. Lots of mature sound here from a "cheap" pair of speakers. Pretty amazing bass from a 6.5 speaker in a "small" cabinet.

Cons: Highs are slightly under-defined. Have to dial in a tad more treble, but nothing crazy. Honestly, I was worried that these high-resolution Terylene tweeters, would be in your face, but they are pretty laid back. Not really a con, but needed to mention. LOL

Polk Audio Signature S20

Crutchfield customer from Newtown, CT on 6/6/2018

Crutchfield Customer Review (What's this?)

After much research, I bought these Polk S20s from Crutchfield three months ago to replace a pair of wonderful Advent speakers that were 33 years old and were disintegrating. Never thought I would find an acceptable replacement for them. But these speakers come pretty close. They deliver superb sound and have surpassed all my expectations. I was so impressed that I bought the S10s for my rear surround, Polk PSW10 Subwoofer, and the Polk Blackstone TL3 for the center channel, replacing a 10 year old Bose. I couldn' be happier.



Overkill Fidelity at a Bargain Price

Rob from Lee, MA on 4/8/2018

Crutchfield Customer Review (What's this?)

I bought these as surround speakers in an all American HiFi Series 5.1 surround system and could not be happier. Not difficult to imagine another set of these to use as "Zone 2" mains.

Pros: Hi Fi, Low Price

Cons: Almost too big and curvy for clamp mounting.

Polk Audio Signature S20

Guest from California on 2/7/2018

First off, I gave them only 4 stars because of the price. ELAC B6 Debut speakers (also sold here) are superior in every way. If you can audition these to other speakers in the $300 range then you should do it. These are a fine speaker, but, not good for the price. ~ peace

Pros: New Design tech.

Cons: Too Expensive!

Signature S20

Tom from Bayonne, NJ on 2/7/2018

Crutchfield Customer Review (What's this?)

Great sound, am using them for rear surrounds, and they will be sitting on top of a pair of modified audio/video racks that flank my sofa, putting them at ear level. I have the Signature S35 for my center, and the Signature S60's for my fronts. A bit too big to mounted high up on a wall for surrounds, the S15 or S10 would be a better choice.

Pros: Sound and build quality are excellent.



Brian from CA on 1/2/2018

Crutchfield Customer Review (What's this?)

Was replacing Sony surround sound speakers that came in a combo set with a receiver. I wanted to change from 5.1 surround to 3.1 and have a better 2 ch for music. I used the S20 as a front L&R. Also wanted a bookshelf speaker with a 6.5" woofer to give a full sound. These did not disappoint! As far as music I can't even compare these to the small Sony speakers they replaced. They have a clean rich sound and very full range. I'm also surprised how much bass these provide. For pop, rap and r&b I turn on my sub for some help. When I crank up the volume my sub can't keep up with the S20's so now it's time to upgrade that!

Pros: Can be placed close to wall

Cons: None

Polk Audio Signature S20

Crutchfield customer from Houston, TX on 12/22/2017

Crutchfield Customer Review (What's this?)

Greatly improved the surround sound in my den. Television, movies and music all sound better.



Polk Audio Signature S20

Crutchfield customer from Palatine, IL on 8/27/2017

Crutchfield Customer Review (What's this?)

They're good for this price point. I didn't need to spend more as I just needed audio for my workouts & these fit the bill perfectly.



Great sound, but way too big

Jason from Elizabeth, CO on 7/16/2017

Crutchfield Customer Review (What's this?)

Great sound out of these speakers. I'm using them as the rear surrounds in a 7.1 home theater. I wish I'd paid more attention to the dimensions before I bought them for this purpose; they're huge! I have them on wall-mounted brackets and they are simply enormous sticking out from the wall. Also, the cabinets are rounded at the corners, so the mounts can't really clamp onto them. I wrapped a black sleeping bag strap around them to keep them in place on the mounts. I'm very satisfied with the sound, but I should have gone with something smaller. Considering their size, these really shouldn't be considered an option for surrounds, which is the only reason not to give them 5 stars.

Pros: Good fidelity and bass response

Cons: Way too big to be surrounds

Sweet Sounding!

Brian from Okemos, MI on 6/5/2017

Crutchfield Customer Review (What's this?)

I picked these speakers online to accommodate a new higher end CD player I had just purchased which sounded too harsh with my current speakers that had metal tweeters. I picked the Polk S20 speakers because: 1) they did not have metal tweeters; 2) a strong bass frequency response of 39 hz; 3) the price was unbelievable at $299 for the pair. These speakers are thoroughly enjoyable; detailed and clear; can pound the bass; no harshness or listening fatigue with the new higher end CD player. I have paid three times this amount for highly rated speakers that were fine in their own right but I love the sound of these S20 Polks! RECOMMENDED!

Pros: More musical and enjoyable that some speakers costing much more. Clear, concise, can bang out rock and still finesse detailed music at lower volumes. VALUE - PRICE!

Cons: Funky plastic covers on back covering bass porting. I can live with it!

great value

Bill from Beverly, MA on 5/19/2017

Crutchfield Customer Review (What's this?)

These replaced a 35 yr old pair of pretty good ADS bookshelf size speakers as front units in a 5.1 home theater which I also use for music, specially vinyl. 125 watt Denon 1713 amp, boston acoustics front, Mirage sub. I've recently upgraded the turntable, better cartridge (Ortofon blue) a phono preamp (music hall 2.1), and the system sounds great. These speakers fit my space and really kicked it up a notch. With a 6.5 inch woofer these are a great value in a large bookshelf size. They were suggested by my Crutchfield advisor who was right on with his advice, and steered me away from some more expensive speakers after going over my system and requirements.

Pros: great sound for the money

Cons: none

Great speakers for their size and price

gary from Reno, NV on 1/17/2017

Crutchfield Customer Review (What's this?)

So far I'm enjoying these speakers. They replaced some very old Boston THX book shelf speaker as the cones had gone bad after 20 + years. The sound is great for the size of room we have and works well with our ceiling surround speakers. Good base but not over the top. Could not ask for more for the money.

Pros: Compance, great sound good base but not to much. Just right for our area.

Cons: non that I can think of

Big improvement. Love Polk.

Crutchfield customer from Great Cacapon, WV on 12/20/2016

Crutchfield Customer Review (What's this?)

We have limited space so I put these in a cabinet rather than out on a shelf. Wasn't quite sure how they would sound. These fit nicely (about 2 inches of space all around) and the sound is great. Nice highs and lows for both streaming videos and streaming music through Roku. We were missing a lot of bass previously. These provide much more bass than we had before (the system was 5 small speakers with a powered sub-woofer). Receiver is an Onkyo (also from Crutchfield).




Hands-on research

Features and Specs

Enclosure Bass Reflex
Video Shielded No
Tweeter Type Dome
Tweeter Size (inches) 1
Midrange Size (inches) N/A
Woofer Size (inches) 6.5
Woofer Composition Mica-reinforced polypropylene
Woofer Surround Butyl rubber
Power Range 20-125
Sensitivity 88 dB
Impedance (Ohms) 8
Frequency Response 39-40k Hz
Connector Type 5-way post
Bi-amp Inputs No
Height (inches) 14-3/4
Width (inches) 8-9/16
Depth (inches) 13-13/16
Weight (pounds) 17
Mounting Bracket Included No
Recommended Stand Height (inches) 24-28
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research


Dynamic Balance Drivers: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion. Using just the right materials enables Polk to eliminate issues that reduce speaker performance and tune out performance-robbing resonances before they occur. Dynamic Balance ensures a rich, clean, full-range sound no matter what you're listening to. The Polk Signature S20 bookshelf loudspeaker incorporates a Dynamic Balance two-way driver array with one 1" tweeter and one 6.5" woofer.

  • Hi-Res 1" Terylene Tweeter: The Signature S20 bookshelf loudspeaker utilizes Polk's newly designed 1" Terylene tweeter to deliver clear and detailed high-end response for realistic reproduction of vocals and instruments. It will support high frequencies up to 40kHz to perfectly reproduce the latest high-resolution audio files with improved audio extension, earning Hi-Res Audio Certification.
  • 6.5" Mica-Reinforced Polypropylene Woofer: The Signature S20 bookshelf speaker employs one 6.5" Dynamic Balance low distortion mica-reinforced polypropylene cone woofer for clean, clear bass, better linearity, and increased dynamic midrange and midbass. This mica-reinforced polypropylene woofer features a butyl rubber surround, massive ceramic motor structure, and a high-temperature Conex fiber spider that combine to create a driver of exceptionally high efficiency, for clean, clear bass, better linearity, lower distortion, and greater durability.

Power Port Technology: The Signature S20 bookshelf incorporates Polk's Power Port technology with a specially designed rear-firing port. Power Port technology smoothly transition air flow from inside the speaker into your listening area for deep, extended bass impact while minimizing turbulence and distortion. Polk's patented Power Port technology delivers 3dB more bass response than a traditional ported speaker.

Non-Resonant Enclosure: The bookshelf speaker's strong, rigid and acoustically inert enclosure reduces unwanted internal standing waves for less audible coloration. And non-resonant Meddite MDF construction, extra bracing, and a thick front baffle ensure a more lifelike sound. The enclosure's curved edges not only look cool, they reduce standing waves inside the cabinet for less audible coloration. The enclosure features a beautiful black washed walnut finish.

Anti-Diffraction Magnetic Grille: The Signature S20 includes an anti-diffraction magnetic grille for unaltered sound. The integrated magnets make it easy to attach and remove the grille from the bookshelf speaker.

Two-Way Crossover: The bookshelf speaker employs a high-performance two-way crossover array (2.5kHz) for seamless blending and optimum time alignment of the tweeter & woofer, creating a lifelike soundstage.

5-Way Binding Posts: The bookshelf loudspeaker features 5-way binding posts for a secure connection to your speaker wire. The 5-way binding posts will accept bare wire (up to 10AWG), pin-connectors, spade-connectors, and banana plugs (single or dual). The speaker terminals are color coded for easy identification between positive (red) and negative (black).

Applications & Placement: The Signature S20 bookshelf speakers can be used as front and/or surround speakers in a home theater setup. They can also be used in a simple stereo application. If your AV receiver offers built-in bass management, the S20 should be set to "Small" to filter out low bass frequencies.

  • Placement for Front Speakers: As a pair of front speakers in a home theater or stereo setup, create an equilateral triangle between the speakers and the listening position - with the speakers placed as far apart from one another as the listeners are sitting from them.
  • Placement for Surround Speakers: As surround speakers, the S20 should be placed on a side wall slightly behind and above the listening position. If you cannot place the speakers on the side walls, position them on the rear wall above the listening area.

Mounting Options: The S20 bookshelf loudspeakers come with self-adhesive rubber feet so they will sit safely and securely on your speaker stands or shelf. The included rubber feet add approximately 0.125" to the height of the speaker. The bookshelf speaker does not include any type of provisions for wall-mounting.

Signature Series: Polk designed its Signature Series of loudspeakers to bring a big surround sound and a live music experience into the comfort of your living room at an affordable price. Featuring Hi-Res certification with a new high-resolution Terylene tweeter, redesigned Dynamic Balance drivers, precision crossovers, an anti-diffraction magnetic grille, modern cabinet styling and exclusive Power Port bass enhancing technology, Polk's Signature series loudspeakers deliver crystal clear highs, detailed midrange, and deep bass; plus they look great in almost any decor. The Signature Series by Polk consists of two center-channel speakers, three bookshelf loudspeakers, and three tower speakers.

Note: You may also want to add one of Polk Audio's powered subwoofers (sold separately) for even more bass response.

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.

Staff Reviews

Product reviews from the Crutchfield Labs

Polk Signature Series home speakers give you big sound for your music and home theatre. They're high-res certified, and they look great, too.

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