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Polk Audio LSi7

Bookshelf speakers (Cherry finish)

Item # 107LSI7C

Discontinued item

Item # 107LSI7C

60-day returns

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

Since 1974

Years of experience making people happy.

Hands-on research

We double check the details on each item.

About the Polk Audio LSi7

Get exceptional sound from these compact bookshelf speakers

To all appearances an ordinary speaker, the new LSi7 is revealed as a master of pristine audio reproduction when connected to your system. Few compact speakers deliver such sophisticated and incredibly alive sound. Yet, thanks to the outstanding LSi design — responsible for some of the best-sounding Polk speakers we've ever heard — that's exactly what you get.

LSi lifestyle

Clear highs and smooth mids

Exploded speaker

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

How did Polk get a small bookshelf speaker to provide this kind of sound? By not treating it like one. Although some companies use top technologies and build quality in their tower models only Polk showed real care throughout the LSi Series. The LSi7 boasts a sturdy cabinet that's well-braced to eliminate muddying resonances. It has a 5-1/4" aerated polypropylene Dynamic Balance® driver that teams up with an Acoustic Resonance Control (ARC) design to deliver lush, richly textured vocals and mids. A Power Port offers satisfying, precise bass, while a 1" Ring Radiator tweeter sends out memorable, detailed highs. Once you hear it, you'll understand why audiophiles are sitting up and taking notice of the LSi series.

Great for home theater or stereo music setups

The LSi7s make excellent front left and right speakers in a small setup, or surrounds in a larger one. Nice extras include anti-diffraction grilles for spacious, accurate imaging, and two pairs of five-way, gold-plated binding post terminals for biamping or biwiring.

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

Priced per pair

Product highlights:

  • video-shielded
  • bass-reflex
  • frequency response 53-26,000 Hz (-3dB)
  • 4-ohm impedance; these speakers must be powered using high-current amplification
  • sensitivity 88 dB
  • handles up to 150 watts
  • keyhole slots
  • dual 5-way, gold-plated binding post terminals
  • real wood veneer
  • 8-5/8"W x 14-1/4"H x 10-1/4"D
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # AM2177-D

What's in the box:

  • 2 Cherry bookshelf speakers
  • 8 Self-adhesive rubber feet
  • Owner's Manual
  • Product Registration Card
  • "Register Online" sheet
  • LSi7 Wall Mount Template

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Crutchfield response

<< >>

More details on the Polk Audio LSi7

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 20-150
Sensitivity 88 dB
Impedance (Ohms) 4
Frequency Response 53-26k Hz
Connector Type 5-way post
Bi-amp Inputs Yes
Height (inches) 13-11/16
Width (inches) 8-5/8
Depth (inches) 10-5/16
Weight (pounds) ---
Wall-mountable ---
Bracket Included Yes
Recommended Stand Height (inches) 24-26
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Driver Technology
Enclosure Design
Mounting Options

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.

Frequency Response Note: The overall frequency response is 45Hz-27kHz and the -3dB frequency response is 53-26kHz.

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.

Mounting Options

Wall Mounting: The Power Port back plates on each speaker have key hole slots, allowing the speakers to be mounted on the wall using optional hardware.

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