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

Why choose bookshelf speakers?

Bookshelf speakers may be small in size, but they can deliver surprisingly big sound. Some ultra-compact models even fit on a desktop. Most are right at home in tight spaces like shelves, so they're usually good choices for your home theater's rear channels. For the best performance, try placing bookshelf speakers on solid speaker stands to help the sound really "open up." If you want full bass impact, add a powered subwoofer and enjoy punchy sound that's as deeply satisfying as that of floor-standing speakers.

Hands-on research

What's in the box?

Download owner's manual

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

Product Research

Driver Technology
Enclosure Design
Connections
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.

Connections

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.

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 open the box, verify contents, 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.

Polk Audio LSi7 Reviews

Average Customer Review:

7 reviews
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Polk Audio LSi7

Written By kyle, St.Charles MO on Monday, December 10, 2007

First of all I have had these speakers for about two years. They were slightly out of my price range, but I've dealt with Polk brand speakers before and I have never been disappointed.


There are some concerns about lack of bass that I read about on many review forums. These speakers have excellent bass response when given proper time to break in. Also when using bookshelf speakers, many people do not get the proper placement. When using smaller speakers you need to place them closer to your walls, it makes a difference. That being said, of all the bookshelf speaker systems I've heard, the Polk's have the best bass response.
These speakers sound very clean, and I've read that they can be very power hungry. I don't know exactly where some people get these ideas, but I am powering my lsi7s with a 13 watt per channel tube amplifier. It sounds wonderful. Sometimes I will be sitting and listening to a song that I am familiar with, but for the first time with the speakers and I find extra detail that I couldn't detect on some cheaper systems. A very good buy in my mind.

Also, there are complaints about the fact that these speakers are only 4 ohm. Yes that will be more difficult of a load for most consumer amplifiers to run. These speakers were built for bi-amplification though. One amp runs high freq to the tweeter and the other runs bass for those who are newer than I to the audio game. These speakers also work well just Bi-wired for those of us who still have budget confinements. If you have an a/b/a+b speaker selector on your amp and you aren't using the b, I suggest you run the a's to the tweeter, and the b channels to the bass. There are a lot of resources that say bi-wiring has real life advantages. These speakers have a lot more potential then most people care to meet.


Summary, A great buy. A bit pricey, and if you get these speakers, don't expect to run them with a 2 or 3 hundred dollar amplifier/reciever. You wouldn't put bottom dollar gas into your sports car unless you had to. Don't put cheap power into these speakers. I've never been more satisfied with any audio purchase.

These are great speakers!

Written By mccoy, Helena, MT on Tuesday, November 20, 2007

As always Crutchfield's service and support is the best you can get from any audio dealer. These are truly great sounding speakers. They present very good imaging in my theater setup and you get what you pay for. Some people have complained that this series lacks bass which is true if you forgot about purchasing a sub with your system. Honestly they sound much better if you simply adjust the crossover setting around 110hz if you want that extra punch in them. My only gripe is that like the LSI9 series these are 4ohm speakers, so your amp will run a little hotter than normal if your using them in a 5.1 or 7.1 setup. But if your like me you purchased these speakers because they are $200 cheaper than the LS9 with the same tweeter/woofer and they don't stick out an additional 5 inches from my wall.

Polk Audio LSi7

Written By David, Olympia,WA on Saturday, October 20, 2007

Crutchfield Customer Review (What's this?)

I've had the LSi7s for just over a week and I absolutely love them. I auditioned several other speakers along with the Polk LSi7. I'm convinced I got the best speaker I could for the money. That's what it's all about, isn't it; getting the best dollar-value you can?
The Polk's image beautifully, have remarkable clarity and offer true musical reproduction.
I've heard some people complain that they lack bass. I haven't found that to be true in my case and I listen to a wide range of music. About the only thing I don't listen to is rap. For a book shelf speaker, they have plenty of bass. If you need more, buy a sub woofer. I have mine on 24" Sanus stands and they sound great.
They also look good, which doesn't hurt at all.
I've always been impressed with Polk products and the value you get for the money you spend. The LSi7s are no exception. A great product at a reasonable price. In this day-and-time, that's unusual. If you're looking for a speaker in this price-range, the Polk LSi7 is as good as it gets.

Polk Audio LSi7

Written By Mark, Silver Spring Md. on Thursday, May 25, 2006

Crutchfield Customer Review (What's this?)

I found it to be a decent pair of speakers,however a far cry from a $2000 pair of bookshelf speakers I heard.Those speakers sound like "live". However, after 2 weeks, I added a nice subwoofer for a 3-D presentation.
I noted that the Polk Monitor 40,as good as they are had a plastic sound when a pair of congas were played instead of the natural animal skin sound of the LSi7.

Lack of bass

Written By Frank Sonny, Miami, FL on Friday, November 04, 2005

Crutchfield Customer Review (What's this?)

The LSI7 are truly great speakers!
The only problem is that they lack bass.
If you live in and apartment like me you don't want or have the space for to many speakers I was looking for a pair of speakers that would do the complete job.
In the other hand if you have the space to add a woofer this are the speakers for you !

Compare to R15???

Written By Paul, The Colony, Texas on Thursday, September 08, 2005

I own both the LSi 7 and R15 and believe me, there is no comparison. While one could make the argument that the LSi's are overpriced (I disagree), it is absurd to compare them to an entry level speaker. The main problem with the LSi series is that you need a good amp to power them as they are 4 ohm. I have an H/K 7300 and think the sound is great for both movies and music, though I've been told you need seperates for them to sound their best. Bottom line is this, if you have the power to drive them they are a speaker to consider.

Worth the money?

Written By AB, Columbus, OH on Tuesday, July 12, 2005

Yes, these are great sounding speakers. No, they are not worth anywhere near $800! I would call them "arrogantly priced". Compare them to the $100 Polk R15.

Get everything you’ll need to enjoy your new Polk Audio LSi7

You'll need speaker wire to connect your speakers to your amp or receiver. No wire is included with this speaker.
Get your speakers off the floor and at ear level where they are meant to be.
Cut your speaker wire to the exact length you need.
Mount your speakers safely on the wall.
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