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Polk Audio Signature Series S20 2-Way Bookshelf Speakers (Black Walnut, Pair)

  • mfr: AM9534
  • SKU: AM9534
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Product highlights

  • Bookshelf speakers compatible with most systems
  • Dynamic Balance Acoustic Array
  • 6.5" Mica-reinforced polypropylene drivers
  • 1" Terylene dome tweeter
  • Power Port Deep Bass technology
  • Meddite MDF construction
  • Timbre matched design

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Free standard shipping included


Free standard shipping included

Polk Audio Signature Series S20 2-Way Bookshelf Speakers (Black Walnut, Pair)

The Polk Audio Signature Series S20 2-Way Bookshelf Speakers were designed to bring big surround sound music and theater experience right to your living room. The Polk Signature S20 American HiFi Home Theater Bookshelf Speaker continues the Polk tradition of American High-Fidelity. With high-resolution certification, a new Dynamic Balance, precision cross-overs, anti-diffraction grille, modern cabinet styling and Power Port bass enhancing technology, these bookshelf speakers have everything you could ever need to elevate your sound for movies, TV, and music. You can always expect great sound with Polk Audio.

Dynamic Balance

The Polk Audio Signature S20 2-Way Surround Speakers are equipped with a new Dynamic Balanced designed acoustic array that ensures a rich, clean, full-range sound no matter what you’re listening to. This unique patented technology analyzes your speaker’s electro-acoustic and mechanical systems to improve material selection and geometry. The Polk Audio S20 array pinpoints and eliminates issues that might reduce speaker performance, giving you the high-fidelity sound that doesn’t skip a beat.

High-Resolution Performance

Polk Audio is committed to designing audio equipment of only the highest quality. The Polk S20 bookshelf speakers contain a custom 6.5" low distortion mica-reinforced polypropylene mid-range driver with butyl rubber surrounds, massive ceramic motor structures, and high-temperature Conex fiber spiders for exceptionally efficient, clean sound and deep bass. The 1" high-resolution Terylene dome tweeter in the S20 Surround Speakers feature curvilinear formers that extend response and lower resonance. Powered by a ceramic motor, it lowers system resonance and extends low frequency response range, giving you better dispersion in the mid-range and clear and detailed high frequency response that perfectly reproduce sound. Capable of delivering up to 40kHz to support high resolution audio files, the Polk Audio Signature S20 home audio speakers will have you feeling like you are right in the concert hall.

Deep Bass Technology

Polk’s patented Power Port Deep Bass Technology smoothly transitions the air flow from the speaker port to your listening area. Extending the overall S20 bookshelf speaker's bass port, the Port provides greater surface area to eliminate turbulence and distortion for bigger musical impact and deeper bass. The Power Port offers 3dB more bass response output than a traditional port.

Quality Craftsmanship

The Polk S20 American HiFi Home Theater Speakers were designed in a strong, rigid, and acoustically inert enclosure that reduces unwanted internal standing waves. A Meddite MDF construction with extra bracing and minimum thick baffles bring you more lifelike sound than ever before. The Polk Audio S20 speaker system has gold plated 5-way binding posts that are perfect for easy set-up, ensuring the most direct, efficient, and lossless connection possible. Polk Audio designed the S20 with a Timbre matched styling with the same components throughout to achieve seamless speaker to speaker effects.


USB Ports Not Available
Transmitter Power Not Available
Weight 17 lbs (7.71 kg)
Smart Specs
Virtual Assistant Support Not Available
AC Input Power Not Available


Customer Questions
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Returns are incredibly simple. Please log into your account, find your item you wish to return and follow the prompts to make a return. If you do not have an account, click here to find your order and make a return.
You will receive a full refund when you return an item in its original manufacturer’s packaging, undamaged and unmarked. If the item you are returning is priced at less than $35, you will be charged a 15% restocking fee. Please note you will not be refunded any shipping charges. 
You have 30 days to make a return. During the holiday season, from November 1 to December 31, we extend the return window to 60 days. 
If your order has been noticeably damaged in transit, we strongly recommend that you refuse delivery and notify us immediately. Claims for missing items or items damaged in transit must be made within 48 hours of delivery. If there is carrier damage, please contact [email protected] with your order number and a description of the damage. 
Oh no! Please contact our customer service team so we can resolve the issue immediately. You can call us on 1.800.221.0828, email us at [email protected], or send us a message here.  
We do not currently offer exchanges. Please return the item you purchased within 30 days and order what you’d like instead. 
If you ordered a kit, you must return all components and accessories to receive a full refund. 
If you ordered a product that included a free item, you must include the free item with your return. If not, your return will not be accepted and you will not receive a full refund. 
We currently only offer camera repairs at our Brooklyn store. The item must be dropped off and collected in person as we do not accept shipped items for repair. For more information, please call our Brooklyn store on 1.718.431.7900. 
Most items can be returned within 30 days for a full refund. Click here to read our full return policy. 

Shipping and Returns

Same Day Shipping

All orders placed by 4PM( EST), Monday through Thursday, and by 11AM (EST) on Friday, are shipped same day. Orders placed outside these times will ship the next business day. We do not ship internationally or to Puerto Rico, Guam and other US territories at this time. For more details click here.

Free Two-Day Shipping

We offer free expedited shipping on thousands of items within the continental USA (this does not include Alaska and Hawaii).

Flexible, Easy Returns

If you're not happy with your purchase for any reason, our flexible 30-day free return policy makes it easy to get a full refund. Click here to view our return policy.

Ratings and reviews

Polk Audio Signature Series S20 2-Way Bookshelf Speakers (Black Walnut, Pair)

Polk Audio Signature Series S20 2-Way Bookshelf Speakers (Black Walnut, Pair) SKU: AM9534

Rated 4 out of 5 by from Happy with purchase. 4.5 Very good Speakers, punches well above it's price point. I purchased them for rear speakers.
Date published: 2022-03-04
Rated 5 out of 5 by from Buy Refurbished Bought a pair of S20 that were refurbished. Great buy. I believe in buying refurbished or open box as they still have the full warranty. I already had a pair of S15 in my workout room. Great sound!!
Date published: 2022-03-02
Rated 5 out of 5 by from S20's deliver! When I first hooked them up, they sounded so so. However, after a few hours, they really became excellent sound producers. I also thought I had my subwoofer on. I did not! Not only was the sound clear, it also had bass slam. I've had many speakers in my time, and these are right up there with speakers costing 3 to 4 times the cost of these.
Date published: 2022-02-28
Rated 4 out of 5 by from S20 Polk Speakers The order & delivery exceeded expectations. The speakers were a breeze to set up & the difference in sound is unbelievable. The price was competitive with like speakers!!
Date published: 2021-09-01
Rated 4 out of 5 by from Little speakers with a big sound! Well balanced tone especially in the mid and high range when paired with my Mcintosh 1900 receiver. Works well as part of a surround sound set up or in a small living room space. Obviously speakers of this size have limitations if you want thundering bass tones, but It works perfectly for my needs.
Date published: 2021-08-31
Rated 5 out of 5 by from The "S" Stands for "Supreme" I purchased a pair of these on February 23 getting them 2 days later. They replaced a pair of Polk Audio RTi A3's which served their purpose well. After connection and playing my styles of music, I was blown away by their sound qualities. More than enough highs and very good response on the lows where one doesn't overwhelm the other for a well balanced flow of the music. I see why Polk is a leader in this industry. Try a pair and enjoy the show. You won't be disappointed.
Date published: 2021-02-28
Rated 5 out of 5 by from Great sound Small, but have a great sound, vocal clear and vibrant, Bass solid.
Date published: 2020-06-09
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