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Polk Audio LSi9

Bookshelf speakers (Cherry finish)

Item # 107LSI9C

Recommended center channel speaker: Polk LSiC .

Recommended center channel speaker: Polk LSiC .

Discontinued item

Item # 107LSI9C

Hands-on research

We double check the details on each item.

Since 1974

Years of experience making people happy.

60-day returns

If you don't love it, send it back.

About the Polk Audio LSi9

Enjoy engaging sound from these carefully crafted bookshelf speakers

Recommended center channel speaker: Polk LSiC.
Recommended surround speakers: Polk LSi7, LSi9 or LSiFX.

Enjoy engaging sound from these carefully crafted bookshelf speakers

Crisp classical music — check. Complex and layered jazz — got it. High-energy rock, vibrant R&B, lifelike country — no problem! That's because the Polk LSi9s are a part of the critically acclaimed LSi series — a line of speakers that's surprised audio reviewers and audiophiles alike with superb design and powerful, true-to-life sound reproduction. The LSi9 bookshelf speakers are a marvelous way to enjoy incredibly open, beautifully full, and above all, natural sound from a compact cabinet. After all, not everyone who loves great audio has the space (or budget) needed to fill a room with tower speakers.

LSi lifestyle

Clear highs and smooth mids

Exploded speaker

Polk's Ring Radiator tweeter produces crystal-clear highs.

From the 1" Ring Radiator tweeter you'll get the crystalline, transparent highs that give precision to music and home theater. Careful cabinet design and dual 5-1/4" drivers round out lower-end sound very nicely. Other innovations — an anti-diffraction grille for spacious, accurate imaging, ARC Ports for controlling cabinet resonances, and a Power Port for reinforcing bass — team up to bring you a deep, realistic soundstage. A Soundstage! review of April 2002 noted of the LSi9, "Both [its midrange and bass] were full — impressively full for such a small speaker — and smooth. . . . Not only is it an exceedingly refined, first-class performer, it has specific sound qualities that make it stand out in its price class."

Cabinet cutaway

An inside look at Polk's thoughtful speaker design.

Great for home theater or stereo music setups

With this extraordinary aptitude for rendering stereo music with stunning precision, the LSi9 will shine in a multichannel home theater setup as well. Use an LSi9 pair as front left and right speakers in a small setup, or surrounds in a large one. 2 pairs of 5-way, gold-plated binding post terminals let you biwire or biamp your speakers.

Recommended center channel speaker: Polk LSiC.
Recommended surround speakers: Polk LSi7, LSi9 or LSiFX.

Read our in-depth review of Polk's LSi9 speakers.

Priced per pair


Product highlights:

  • video-shielded
  • bass-reflex
  • frequency response 50-26,000 Hz (-3dB)
  • 4-ohm impedance; these speakers must be powered using high-current amplification
  • sensitivity 88 dB
  • handles up to 200 watts
  • dual 5-way, gold-plated binding post terminals
  • real wood veneer
  • 8-5/8"W x 14-15/16"H x 15-1/4"D
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # AM2197-E

What's in the box:

  • 2 Cherry bookshelf speakers
  • 8 Self-adhesive rubber feet
  • Owner's Manual
  • Product Registration Card
  • "Register Online" sheet

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Crutchfield response

<< >>

More details on the Polk Audio LSi9

Stacey B.

Features & specs

Enclosure Bass Reflex
Finish Wood veneer
Color Cherry
Tweeter Type Ring Radiator
Tweeter Size (inches) 1
Midrange Size (inches) N/A
Woofer Size (inches) 5.25
Woofer Composition Aerated poly
Woofer Surround Rubber
Power Range 20-200
Sensitivity 88 dB
Impedance (Ohms) 4
Frequency Response 50-26k Hz
Connector Type 5-way post
Bi-amp Inputs Yes
Height (inches) 14-15/16
Width (inches) 8-5/8
Depth (inches) 15-1/4
Weight (pounds) ---
Wall-mountable ---
Bracket Included No
Recommended Stand Height (inches) 24-26
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Driver Technology
Enclosure Design

Driver Technology

Dynamic Balance: 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.

Aerated Polypropylene Woofers: Each speaker uses an Aerated Polypropylene woofer cone for wide response and low distortion. For superior durability, the woofers use rubber surrounds.

1" Ring Radiator Tweeters: Each speaker features a 1" Ring Radiator tweeter for crisp, transparent highs. The ultra-light woven Ring Radiator Diaphragm delivers flat response, precise detail and overall accuracy. A High Frequency Waveguide prevents phase cancellations for smooth, uniform frequency response and wide dispersion. A Low Frequency Waveguide promotes laminar airflow between chambers to prevent air turbulence. This feature serves the same function as Power Port for Polk's bass systems.

Cast Aluminum Driver Baskets: Cast aluminum driver baskets resist flexing and "ringing" for ultra-tight bass and coloration-free midrange.

Cascade Tapered Crossovers: The Cascade Tapered Crossover array in each speaker ensures flat midrange response and improves imaging focus, and depth. One driver is crossed over much lower in frequency and is in essence a bass-only driver. Only one driver plays the upper midrange frequency range thereby eliminating the interference effects between the two drivers. This gives you the dynamic impact of double drivers with the accuracy and life-like imaging of a single driver system.

Frequency Response Note: The overall frequency response is 38Hz-27kHz and the -3dB frequency response is 50-26kHz.

Enclosure Design

Acoustic Resonance Control (ARC): Internal cabinet resonance can impart a "thick" character to voices. Polk's patented Acoustic Resonance Control port system overcomes this problem. In addition to the Power Port venting system, each speaker has a front-firing port that is tuned to suppress the internal cabinet resonance, resulting in smooth, natural midrange reproduction.

Low-diffraction Grilles: The speakers employ open architecture low-diffraction grilles for spacious imaging.

Power Port Venting System: Each speaker has a rear-firing Power Port venting system built into its back plate for precise deep bass response. This venting system allows air velocity to slow gradually, vastly reducing air turbulence, and delivering greater bass efficiency than conventional ports.


Dual 5-Way Binding Posts: Each speaker has two sets of gold-plated 5-way binding posts connected by gold-plated jumpers. Using the dual 5-way binding posts, you can bi-amp or bi-wire the speakers.

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