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Polk Audio Signature S20

Bookshelf speakers (Black)

14 Reviews | 1 question - 1 answer

Item # 107SIGS20

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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.

Got wire?

Most speakers don't include any. Read our article about choosing and installing speaker wire.
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

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

Anonymous, California


Polk Audio Signature S20 Reviews

Average Customer Review(s):

(14 Reviews)

Polk Audio Signature S20

Anonymous 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.


Polk Audio Signature S20

Anonymous from Chicago, IL on 1/17/2018

Crutchfield Customer Review (What's this?)

I got these speakers to replace our >10 year old Infinity speakers that were smaller and probably lower in the quality lineup. This is in a traditional two-speaker stereo system. The new speakers definitely have richer bass, and at times striking stereo imaging. But I was also struck by a noticeable boxy sound in the mid bass, eg piano passages 1-2 octaves below middle C.




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

Anonymous 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.




Anonymous from Huntersville, NC on 12/10/2017

Crutchfield Customer Review (What's this?)

Polk really stepped it up with the new components in the S20 speaker design. I own different speakers that I've acquired over the years and the one thing I can say is Polk always stays consistent, meaning they just get better and sound great at a reasonable price. I don't know anybody that is spending $5,000 on up for speakers but there is one thing I did learn from an old wirehead friend of mine is that you don't have to spend a ton of money to get great sound and that always stood true with Polk. You will be very impressed with the S20's, don't be shy, step up and grab a pair because I know you won't be second guessing yourself, all you'll be doing is putting on your favorite tunes turning up the volume and getting lost in the great sound.


Cons: NONE

Polk Audio Signature S20

Anonymous 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.



Big, Rich Sound in a Small Footprint Speaker

David from Davis, CA on 8/25/2017

Crutchfield Customer Review (What's this?)

These put out such a big, rich sound for such small speakers. I was intending to use them just to play vinyl and cds, but when I gave them a listen, I immediately hooked them up to the TV, too. So much better than the oild (but pretty darn good, until now) sound bar. I would absolutely buy Polk Audio again.

Pros: Quality of build, ease of hook-up, great sound, small box


Great upgrade for my surround system!

Robert from Richmond, VA on 8/1/2017

Crutchfield Customer Review (What's this?)

I had recently bought a pair of Polk S60's, and was so impressed with the sound, that I bought these for the front of my surround system in a different room. Just like the bigger floor standing models in the Signature Series, these sound great and can hit hard. I probably could have done well with a smaller model like the S15, but I wanted the identical driver that is in my bigger speakers. Just be aware that these are HUGE for shelf speakers, so pay attention to the measurements.

Pros: Solid construction and excellent sound.

Cons: Because it's built so well, it's heavy! Also bigger than they look in the picture, so pay attention to the dimensions before ordering.

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.

Anonymous 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 theater. They're high-res certified, and they look great, too.

What are the Labs?
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

i have a polk s35 center channel speaker and needed new speakers to match with the signature series line. [ brent  Jan 24, 2018 ]
reviews for bookshelf [ MIKE  Nov 19, 2017 ]
I loved the specs on these. Never really considered Polk in the past but after checking out the specs these had the best ratings in their price range. [ John  Jul 04, 2017 ]
Upgrade from my 17 year old Polk speakers [ William  May 10, 2017 ]
Was comparing S20 with Elac B6. Both appeared to be great speakers. I have a polk center channel and was a little concerned about the base on the Elac. Look forward to connection these Polks to my system, [ Gary  Jan 03, 2017 ]
I have purchased Polk speakers from Crutchfield in the past and have always been very satisfied with both the speakers and the service.. [ W  Dec 06, 2016 ]
good reviews, these seemed best bookshelf speakers for bass [ thomas  Jan 04, 2018 ]
excellent match with Polk S60 [ ALEC  Nov 26, 2017 ]
I have other components from Polk and are from signature series and very much learned from enthusiasts that sound is very pleasing and smooth !!! [ Ghanshyam  Nov 25, 2017 ]

1 question already asked

The Polk Audio S20 speakers offer no built-in provisions for wall mounting but you can use "side grip" wall-mount brackets like the Pinpoint AM41: I hope that helps. My Bio: [ Ryan  Feb 16, 2017 ]  Staff