Polk Audio’s Quality Signature Bookshelf Speakers S15

$245.00

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Description

Recent Model Polk Audio’s High Quality Signature Series S15 Bookshelf Speakers in Black Walnut Finish.  Include Original Packaging.

These mid-size bookshelf speakers sound great (including an excellent bass response rated all the way down to 50 Hz) and are in great condition.

From Polk Audio:

“Signature Series – The American HiFi Home Theater System

Built to bring the big surround sound theater experience into the comfort of your living room, the Polk Signature Series
continues in the Polk tradition of American HiFi. Featuring Hi-Res certification, Dynamic Balance driver design, Terylene tweeters,
mica-reinforced polypropylene cones, precision cross-overs, an anti-diffraction magnetic grille, a non-resonant MDF cabinet and
exclusive Power Port technology, you get elevated sound for movies, TV and music in a totally re-imagined design.
Polk—expect great sound.

Dynamic Balance Technology Driver Design
Whether upgrading your home theater setup with an advanced Atmos configuration or enjoying your favorite music, Dynamic
Balance ensures a rich, clean, full-range sound no matter what you’re listening to. This patented technology analyzes the speaker’s
entire electro-acoustic and mechanical system for improved material selection and more efficient geometry. It pinpoints and
eliminates issues that reduce speaker performance before they become a part of the finished product.

High-Resolution Polk Terylene Tweeter Our Terylene dome tweeter features curvilinear formers that extend response and lower resonance. Its powerful ceramic motor structure also lowers system resonance and extend low frequency response for better dispersion in the critical midrange, delivering clear and detailed high frequency response for realistic reproduction of vocals and instruments. Capable of the latest high resolution audio files so it feels like your right there in the studio or concert hall.

Custom Mid-Range Drivers
Mica-reinforced polypropylene cones with butyl rubber surrounds, four-layer voice coils, massive ceramic motor structures and high-temperature Conex fiber spiders combine to create drivers of exceptionally high efficiency, for clean, clear bass, better linearity, lower distortion and greater durability.

Exclusive Polk Power Port Technology
Power Port® is our patented design that smoothly transitions the air flow from the speaker’s port into your listening area. It also extends the overall bass port, providing greater surface area to eliminate turbulence and distortion, for bigger, more musical, deep bass impact. Plus, it offers 3dB more bass response output than a traditional port.

Anti-Diffraction Magnetic Grille
Computer modeled for a precision fit and enhanced good looks—and made to minimize sonic interference.

High Sensitivity and Maximum Compatibility
Works with the most modestly-powered amplifier or receiver. Whether you’re connecting them to the newest digital processor, or your vintage rig, you get sound reproduction that’s spacious, clear, enveloping, and realistic. Plus, it’s compatible with latest Dolby and DTS surround sound technologies.

Gold Plated 5-Way Binding Posts
Perfect for easy setup, they ensure the most direct, efficient, and loss-less connection possible.

Quality Crafted Cabinet Design
Strong, rigid and acoustically inert enclosure reduces unwanted internal standing waves for less audible coloration. And non-resonant all-MDF construction, with minimum .75” inch-thick baffles, ensures a more lifelike sound.”

Specifications:

Tweeter: 1 x 1in Terylene High-Res Dome Tweeter

Mid-Bass: 1 x 5.25in Dynamic Balance Mica Reinforced Polypropylene Driver

Crossover Frequency: 2.5 kHz

Wall Mounting Option: Key Hole slot

Recommended Amplification (wpc): 20 – 100

Impedance: 8 Ohm

Overall Frequency Response: 50Hz–40 kHz

Sensitivity: 88dB

Dimensions: Height 12″ (30.48 cm), Width 7.5″ (19.05 cm), Depth 10.25″ (26.04 cm), Weight 13 lbs (5.9 kg)

The Signature S15’s have an MSRP of $399 + HST ~ $450 CND.

Comes with original packaging. Asking just $245 for this pair in excellent condition. We also sell this model new for a very competitive price (that we’re not allowed to list here). Please contact us for details if you’d like to purchase a new pair.

Additional information
Weight30 lbs
Dimensions14.25 × 21 × 16 in
About brand
Polk Audio at Radique
New Polk Audio, too, quoted direct from the Canadian distributor:
We service Polk, too. Bring us your own Polk speakers and subwoofers for repair, servicing or restoration (speakers up to 80 lbs each), with a 90-day warranty on the work. See our Audio Service page

Polk Audio began in Baltimore in 1972, founded by Matthew Polk, George Klopfer and Sandy Gross. Its SDA speakers of the 1980s used a cable between the left and right speakers to widen the stereo image. We carry Polk towers, bookshelf speakers, centre channels and subwoofers. We've had more than 180 Polk listings so far, covering more than 80 different models. Every used Polk here is inspected, tested and serviced as required, then photographed in-house and covered by our Bumper-to-Bumper Warranty and Perpetual Trade-Back Program. Looking for new Polk? We also quote new Polk Audio direct from the Canadian distributor, with free shipping within Canada: request a quote below. Don't see the model you want? Tell us on First Dibs and we'll email you when one arrives.

Our five best-selling Polk models so far: the RTi10 towers, the PSW10 and PSW125 subwoofers, the RTi4 bookshelf speakers and the CSi3 centre.

The Polk story, 1972 to today

Matthew Polk, George Klopfer and Sandy Gross, graduates of Johns Hopkins, founded Polk Audio in Baltimore, Maryland, in 1972. The Monitor 7 of 1974 was their first model to succeed, and the Monitor 10 followed in 1976.

SDA. In 1984 Polk introduced SDA (Stereo Dimensional Array). A cable between the left and right speakers lets each one cancel the sound that crosses over to the wrong ear, for a wider stereo image.

Growth. Polk went public in 1986 and moved to new premises in Baltimore. It began moving manufacturing to Tijuana, Mexico, in 1988, and by 2012 Stereophile reported that Polk designed in the US and built in China.

New owners. Directed Electronics agreed to buy Polk in 2006. Polk later became part of Sound United, Masimo bought Sound United in 2022, and in September 2025 HARMAN, a Samsung company, completed its purchase of Sound United. The 2018 Legend series brought SDA back.

Which Polk is which?

Monitor (1970s to early 1990s): the Monitor 4, 5, 7, 10 and 12, with A, B and C revisions.

SDA (1984 to about 1991): the SDA-1 and SDA-2 families, CRS, SRS and the later "TL" models.

RTA (1979 to 1992): towers such as the RTA 11t, with two woofers and two passive radiators.

RT and RTi (2001 onward): Polk's lower-priced lines. Our best-selling RTi10 towers and RTi4 bookshelf speakers come from here.

CSi centres and PSW subwoofers: the CSi3 centre and the PSW10 and PSW125 subwoofers are among the Polks we sell most.

LSi (about 2001 to 2010) and LSiM (2011): Polk's flagship lines of that decade, followed by Signature (2016), Legend (2018) and Reserve (2021).

Buying used Polk: what to check

SDA cable. SDA speakers need the interconnect cable between them for the SDA effect, and early SDA models need a common-ground amplifier. Make sure the cable comes with the pair.

Tweeters. Owners report that some SL3000 tweeters on the 1989 to 1991 SDA TL models leaked their ferrofluid and failed, and that Monitor-series pairs may carry mismatched factory or replacement tweeters. Check that every tweeter plays.

Surrounds. Some early Polks used foam surrounds, which rot with age; later models such as the RTA 11t and LSiM use rubber. Press gently on each woofer surround.

Everything we list is inspected, tested and serviced as required here, and comes with our warranty.