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Polk Audio Signature S15

Bookshelf speakers (Washed Black Walnut)

22 Reviews | 1 question - 2 answers

Item # 107SIGS15

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Our take on the Polk Audio Signature S15

Polk's Signature S15 bookshelf speakers serve up clean, accurate sound, making them a great choice for today's high-resolution digital music or for use in a surround sound system. With their curved edges and attractive black or walnut finish, these stylish speakers look great in every room.

Dynamic sound for music and movies

Polk's Signature S15 bookshelf speakers serve up clean, accurate sound, making them a great choice for today's high-resolution digital music or for use in a surround sound system. With their curved edges and attractive black or walnut finish, these stylish speakers look great in every room.

Polk Audio Signature S15

Polk Audio Signature S15 speakers offer natural, detailed sound for music and movies.

Built for smooth sound

The S15s 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 5-1/4" 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 S20
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: 50-40,000 Hz
  • sensitivity: 88 dB
  • 8-ohm impedance
  • handles up to 100 watts
  • 1" Terylene high-res dome tweeter
  • 5-1/4" 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
  • keyhole slot for wall-mounting
  • 7-9/16"W x 12-1/16"H x 10-1/4"D
  • weight: 13 lbs.
  • warranty: 5 years
  • Our 60-day money-back guarantee

What's in the Box:

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

Polk Audio Signature S15 Reviews

Average Customer Review(s):

(22 Reviews)

Awesome sound quailty!

Crutchfield customer from Algona, IA on 1/24/2019

Crutchfield Customer Review (What's this?)

I bought a pair for the living room and the sound quality is so good that I had to buy another pair for the basement. These are the best bookshelf speakers I've ever had.



Polk Audio Signature S15

Steven from Pittsburgh, PA on 1/10/2019

Crutchfield Customer Review (What's this?)

Great product for the money.

Pros: The speakers look and sound great.


Polk Audio Signature S15

Tom from Bayonne, NJ on 1/4/2019

Crutchfield Customer Review (What's this?)

Got these as the primary surrounds, and am using a set of the S10's as the surround back speakers. Great sound from these speakers.

Pros: Build, quality and sound


Polk Audio Signature S15

Crutchfield customer from Yauco, PR on 12/31/2018

Crutchfield Customer Review (What's this?)

Realy good sound!



A great purchase

Jeffrey A from Charleston, SC on 12/19/2018

Crutchfield Customer Review (What's this?)

I bought these along with a Denon AVR-S540BT receiver for my bedroom. They're a match made in Heaven. These speakers are very accurate all along my ears' listening range (which is still pretty good). The price of both were very nice as well.

Pros: Quality, great name, great audio representation.


Seems you get more than what you pay for

Robert from Raleigh, NC on 12/17/2018

Crutchfield Customer Review (What's this?)

My expectations where not high for these because the price was so low. When they arrived, I couldn't wait but to open them. The very first thing my wife and I noticed is how good they look for the money. Of course they are vinyl wrapped, but the wrap has a slight woodgrain texture to it. The brown walnut color is a bit darker than I was expecting, but it still looks great. The magnetic grilles are a nice plus for the price too. I swapped our older Paradigm Mini Monitors V2 for these. Even before the break-in was complete, the Polks sounded fuller though the overall spectrum. My hearing is going so I the highs elude me. What I did notice is that the Polks have better midrange than the Paradigms. The Paradigms always had a dip I just couldn't get used to. You will need a sub regardless of placement. I have a 8" ported for the task, albeit someone limited in the size of new living room. I also ordered the S35 which is so much better looking than a soundbar and it is more sleek and nimble than the larger center speakers out there. I have a newer model Yamaha 5.1 receiver powering these. I see some complaints regarding size. They are not big, nor small.. about average. It's the 6.5" model which is BIG. For reference that is a 55" TV in my pick.

Pros: Rounded corners Beautiful for a vinyl wrap Polks proven technology

Cons: Somewhat larger compared to others Strange port thing on back which may potential limit installation options

Very Impressed

Sean from Bakersfield, CA on 12/10/2018

Crutchfield Customer Review (What's this?)

These are replacing an old Denon surround system and I cant believe how amazing they sound. I also purchased a center channel S30 which compliments these very well. Now looking to replace the rear with a nice set of in ceiling Polks and complete the package

Pros: Good Construction Well Priced Great bass for small package

Cons: Maybe a bit big if you are looking for a compact speaker

Polk Audio Signature S15

Nicholas from Akron, OH on 11/5/2018

Crutchfield Customer Review (What's this?)

I am using these as surrounds in a complete 5.2 Polk Signature Series system. As always I have to give credit to my advisor Kristina...she always helps me pick the right stuff! My system consists of 2 s60 Towers, s30 center channel as well as 2 Polk HTS 12 subwoofers. I am very happy with the detail and depth that these bring to the surround sound experience. Don't hesitate to buy these they are a steal for the price!



Great Speakers

Omar from Longview, TX on 10/27/2018

Crutchfield Customer Review (What's this?)

Great speakers and great quality i use two pairs in my home theater as fronts and rears as well as a S30 center channel and sound good on music, games and movies. The mids and highs are great but, not enough bass overall great speakers.

Pros: Great sound, the mids and highs range are great and get loud and clear

Cons: Not enough bass for my taste, but that's all

Nice speakrers

Lee from Vancouver, WA on 10/21/2018

Crutchfield Customer Review (What's this?)

Nice sound, nice look

Pros: Fit nicely in my event tote

Cons: weigh alot if that's a con

Great sound in my home theater

Frank from Parker, CO on 9/17/2018

Crutchfield Customer Review (What's this?)

Love these speakers. They are a bit big though nothing like the S20's. I use them for a mix of movies/games/music and they provide great sound for each. I love how they look and they are very solidly built

Pros: Great Sound, Great look

Cons: Big

Polk Audio Signature S15

Crutchfield customer from Eagle, CO on 9/10/2018

Crutchfield Customer Review (What's this?)

Good sound.


Cons: Overall size vs speaker size is a little bulky.

Polk Audio Signature S15

Guest from Indianapolis, IN on 6/25/2018

I purchased an Onkyo HTIB system a few years ago. I recently purchased the Polk S30 to replace my center channel speaker. That review is on Crutchfield's site already. Once I installed that center I immediately noticed my Fronts were lacking. If I had the space/money I would get the S60's, but that is beside the point. So I decided to replace the speakers that came with my HTIB with these S15's. So like the S30, I immediately noticed a massive quality improvement over my existing speakers. I love the look of the veneer on the Polk Signature series. They are a very "handsome" speaker and you can feel and see the quality from the moment you unbox them. I got them hooked up and mounted and had to spend a bit of time getting them calibrated and what not. It was an interesting feeling when I started demoing some material. I was expecting a very dramatic change and to be blown away. Well it was dramatic and I was blown away, but in a very calm way. I immediately felt like my room was just more "full" with sound. Before I felt that the room felt odd/empty except when I was directly in front of my center channel. Now I feel there is one massive speaker the width of my entire wall projecting sound at me. I will definitely continue upgrading my system to more Polk Signature Speakers in the future.



Polk Audio Signature S15

Crutchfield customer from NY on 2/4/2018

Crutchfield Customer Review (What's this?)

Nice sound to go along with my other Polk signature speakers



Bargain lil soundar beaters

Steve from Kelso, WA on 12/25/2017

Crutchfield Customer Review (What's this?)

Very happy with these paired with an Emotiva A -100 amp for my bedroom TV. Debated this vs soundbar, I made the right choice. In my cave setup I've had lots of equipment from many brands, Klipsch, VMPS, Vandersteen, KEF, Paradigm Studio, Tekton Design towers, these little Polks sound good to my ears. The price I paid was well worth it.

Pros: Sound quality

Cons: The sticker on the cabinet difficult to remove and unnecessary. Polk logo on the grill too large

Smooth Sounding Bookshelf Speakers

Stephen from Leland, NC on 9/18/2017

Crutchfield Customer Review (What's this?)

The S15s have a very smooth sound. Bass is not overbearing but present. Highs come through nice and clear and not harsh. I'm using them as the back channel for a Dolby Atmos 7.4.2 Home Theater system with great results. I built two 40" high speaker stands to hold the S15s. I think they look and sound great!

Pros: Heavy/Solid construction Smooth Bass Clear highs Beautiful to look at

Cons: None

Polk Audio Signature S15

Jeff from Cleveland, OH on 8/9/2017

Crutchfield Customer Review (What's this?)

Sound great and look really sharp. The Polk Signature series is very impressive for the price point.

Pros: -Great sound -Clean, sharp design -Banana plug connections

Cons: -A bit bulky for the size of the drivers

Polk Audio Signature S15

Crutchfield customer from Staten Island, NY on 4/15/2017

Crutchfield Customer Review (What's this?)

Gteat sound and style.

Pros: Nice looking speakers with great sound quality.

Cons: Big bulky

Polk Audio Signature S15

Crutchfield customer from Monticello, KY on 2/27/2017

Crutchfield Customer Review (What's this?)

Great product. Use them as rear surround sound and they work very soothly.



Sounds great!

Jason from Quakertown, PA on 12/23/2016

Crutchfield Customer Review (What's this?)

Sounds great!



Sound is amazing

Crutchfield customer from Hutto, TX on 12/10/2016

Crutchfield Customer Review (What's this?)

Bought these for my front R/L paired with the S30 (center), S10 (surround) and yamaha RX 760 receiver. Sound is fantastic, these speakers really bring the whole system together. I can't find anything wrong with these, you can hear every detail be it movies or music. Can't go wrong with these speakers at this price.

Pros: Value, range of sound and they look great

Cons: None that I can hear or see.

Great looking speaker.

Robert from Grayslake, IL on 11/1/2016

Crutchfield Customer Review (What's this?)

So far so good. Not too small, not too big but big in sound for this size.

Pros: Sounds great.

Cons: None


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) 5.25
Woofer Composition Mica-reinforced polypropylene
Woofer Surround Butyl rubber
Power Range 20-100
Sensitivity 88 dB
Impedance (Ohms) 8
Frequency Response 50-40k Hz
Connector Type 5-way post
Bi-amp Inputs No
Height (inches) 12-1/16
Width (inches) 7-9/16
Depth (inches) 10-1/4
Weight (pounds) 13
Mounting Bracket Included Keyhole
Recommended Stand Height (inches) 24-30
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 S15 bookshelf loudspeaker incorporates a Dynamic Balance two-way driver array with one 1" tweeter and one 5.25" woofer.

  • Hi-Res 1" Terylene Tweeter: The Signature S15 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.
  • 5.25" Mica-Reinforced Polypropylene Woofer: The Signature S15 bookshelf speaker employs one 5.25" 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 S15 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 S15 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 S15 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 S15 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 S15 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 S15 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 speakers also have a keyhole slot bracket on the back panel, allowing the speakers to be mounted on the wall using optional mounting screws (sold separately). A wall-mount template is provided to assist you.

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?

to upgrade my aging home speakers with same brand from crutchfield [ Ildefonso G.  Nov 29, 2018 ]
I picked these because they come highly recommended by my local audiofile specialists. I look forward to trying them out as part of a 5.1 surround sound system. [ Myles  Sep 30, 2018 ]
better long term solution that the RTi's IMO [ Brian  May 27, 2018 ]
Highly rated. Ideal specs for my application. Good price. Helpful advice from chat advisor Levi. I have had very good previous experience with other Polk Audio products. [ David  Mar 04, 2018 ]
The S20 was too large to fit into my bookcase. [ GEOFF  Feb 02, 2018 ]
You are out of stock of Boston Acoustics A25, so I chose the Polk S15. [ Maria  Jan 31, 2018 ]
I've already decided on the Signature series. These will be my surrounds. There's a dedicated surround (S10) pair, but for the price difference wanted the 5.25" drivers. [ Damon  Nov 24, 2017 ]
I already have S55,S35,and S10 and would like to add these to the mix for top ft and left [ JAMES  Aug 26, 2017 ]
The built in keyhole bracket on back. The others I viewed did not have this feature. [ THOMAS E  Jul 23, 2017 ]
Great Brand [ francisco  Apr 17, 2017 ]
picked the Polk S15 to go with my S35 center speaker [ Jeff  Apr 12, 2017 ]
Polk reputation and styling. [ Christopher  Nov 29, 2016 ]
Range, size, and power handling. [ Vincent  Dec 27, 2018 ]
I compared it to other speakers in this price range and higher and found sound quality to be very good. The $70 off helped, too! [ Maximillon  Dec 25, 2018 ]
Looks good, good reviews and on sales! [ Henry  Nov 30, 2018 ]
They look beautiful and I know Polk to have a longstanding reputation for quality and performance. They seem to compare well to other brands in this price point as well. This is my first higher end audio purchase. I hope it turns out great! [ Jacob  Apr 17, 2018 ]
I seen these on display at another store and with the combination of a subwoofer, they sounded great! Also, being able to hang them on the wall was a deal sealer for me. [ Michael  Mar 27, 2018 ]
great sound and match to cabinet woodwork [ Jeffrey  Dec 26, 2017 ]

1 question already asked

You will want a receiver that can do 100 watts, which does mean per speaker. That is highest output though, the range is 20-100. [ Daniel  Dec 29, 2017 ]
Each speaker needs at least 20w and can handle up to 100w. [ Jeffrey  Dec 29, 2017 ]

Looking for more? Check out the next model in this lineup.

Polk Audio Signature S20 BK pr

Enjoy more powerful sound

The Polk Audio Signature S20 offers these features:

uses a 6-1/2" woofer

frequency response: 39-40,000 Hz

handles up to 125 watts