Polk LSIFX Brochure

LSi Series

loudspeakers

polk

nology

LSi Series Ultra High Performance Loudspeakers

deliver the tonal accuracy, spacious imaging

and precise detail demanded by serious listeners.

e and speaker stands cour

nitur

Fur

tesy of SanusSystems

®

.

tech

LSi Series: Loudspeakers For Serious Listeners

LSi25

Side-firing 10" Powered Subwoofers in each mirrored­array enclosure make the LS
capable of filling large rooms with deep, high definition
bass and dynamic, detailed sound. If you crave the tonal

, detail and three-dimensional imaging of a small

accuracy
monitor speaker, and the dynamic range and bass impact
of a floorstanding speaker, you owe it to your ears to hear

i25. Rediscover your love of music!

the LS

Designed for high definition formats such as
SACD and DVD-Audio.
Built-in 10" Powered Subwoofer for true
full-range performance.
Two 5 1/4" drivers with Aerated Polypropylene
Cones for wide response and low distortion.
Ultra high resolution Ring Radiator Tweeters
for superior detail and transparency.

Floorstanding Speaker With Built-In Powered Subwoofer
150W Continuous A
49 3/4" H x 8 5/8" W x 17" D
(126.36cm H x 21.91cm W x 43.18cm D)
Overall Fr

i25 available in 110 volt only.

LS

See specifications for mor

Cherry Ebony

verage Output Per Channel

equency Response 20Hz - 27kHz.

i25 a full range loudspeaker

e detailed product information.

LSi15

Make the remarkable LSi15 the heart and soul of your
high performance stereo or multi-channel sound system.
It features all the extraordinary technologies found in the

i25 model, in a slightly smaller enclosure with an 8"

LS
non-powered side-firing woofer

Mirror-imaged pairs for tightly focused highs
and true three-dimensional imaging.

8" woofer for full-range performance from all sources.

wo 5 1/4" drivers with Aerated Polypropylene Cones

T
for wide response and low distortion.
Ultra high resolution Ring Radiator Tweeters
for superior detail and transparency.

45 1/2" H x 8 5/8" W x 13" D
(115.57cm H x 21.91cm W x 33.02cm D)

equency Response 22Hz - 27kHz.

Overall Fr

See specifications for more detailed product information.

Cherry Ebony

.

Golden Ear,

The Absolute

Sound, 2002

polk

polk

tech

tech

nology

nology

Cabinet resonance can ruin the sound of an otherwise well-designed speaker. You don’t want to hear your speaker cabinets humming along with the
music (they don’t even know the words), you want to hear the uncolored sound launched by the drivers and tweeters. We take special pains to make

e that Polk speaker cabinets ar

sur
of the cheaper and mor
such as asymmetric braces and resonance-damping side panels (for 1 1/2" total cabinet thickness). See more about Anti-Resonant Enclosure at
www.polkaudio.com/catalog/technology/.

2 Polk Audio LSi Series

e r

e r

esonant par

esonance-fr

ee. All wood cabinet Polk Audio loudspeakers ar

d used by many competitive speaker brands. LSi models feature additional anti-resonance strategies

ticle boar

ucted of costly low-resonance MDF instead

e constr

LSi Honors

I am a little stunned by the Polk

“

LSi15…outstanding accuracy,
detail and nuance…”

The Absolute Sound,

April/May 2002

LSi25

Polk Audio LSi Series Loudspeakers feature ultra stiff, well damped, surprisingly lightweight Aerated Polypropylene Cones. They’re 20% lighter than
conventional poly and 35% lighter than aluminum cones. Dynamic Balance composite materials tune out driver r
damping without adding mass. These cones deliver spectacular midrange clarity
Cones at www.polkaudio.com/catalog/technology/.

, punchy bass and high ef

LSi15

esonance, and foamed air pockets add

e about Aerated Polypropylene

. See mor

ficiency

LSi Series

loudspeakers

www.PolkAudio.com / 800.377.7655 (USA & Canada) / 410.358.3600 (Worldwide) 3

Scanning electr
image of Aerated Poly Cone
showing air pockets.

on microscope

LSi Series: Loudspeakers For Serious Listeners

[Polk has] hit the bull’s-eye with the LSi9.Not

“

only is it an exceedingly refined,first-class
performer,it has specific sonic qualities
that make it stand out in its price class.”

SoundStage!.com,

April 2002

LSi9

, usually found only in speakers costing thousands more than Polk speakers, gives the LSi Series its incredi-

The Ring Radiator T
ble accuracy and astonishing detail, to reveal the nuances of your favorite CDs, high definition discs and LPs. The ultra-light woven
ring radiator diaphragm is supported at two hinge points (A & B) and is driven by a centrally positioned voice coil (C). With a higher
ratio of suppor

emarkable tweeter delivers accurate high fr

r
www.polkaudio.com/catalog/technology/.

4 Polk Audio LSi Series

weeter

ted material than conventional tweeters, ther

equencies with pr

mance-robbing resonance to develop. This

s less oppor

e’

ecise detail and wide dispersion. See more about The Ring Radiator at

tunity for per

for

LSi7

B

A

C

LSi9

With the performance characteristics of a premier
floorstanding loudspeaker, the LS
best bookshelf performance possible. Astounding detail,
excellent accuracy and dynamic range (with rear
Power Port for deep bass response), and flawless
fit and finish make the LS
listeners with limited space.

Superior musical accuracy, serious theatrical impact.
Two 5 1/4" Dynamic Balance drivers with Aerated
Polypropylene Cones for wide response & low distortion.

apered Crossover array ensures flat mid-range

Cascade T
response, improved imaging focus, and depth.
Totally inert side panels are 1-1/2" thick.

14 7/8" H x 8 5/8" W x 15 1/4" D (37.78cm H x 21.91cm W x 38.73cm D)
Overall Frequency Response 38Hz - 27kHz.

Stands courtesy of SanusSystems® (not included with speaker
purchase). Available for sale at shop.polkaudio.com.

See specifications for more detailed product information.

Cherry Ebony

i9 will deliver the

-firing

i9 the choice for serious

LSi7

Compact yet powerful, the LSi7 is engineered to deliver all
of the lifelike detail, imaging and accuracy of the larger

S

speakers in the L
speaker for audiophile systems in smaller rooms.

5 1/4" Dynamic Balance driver with Aerated
Polypropylene Cone for wide response & low distortion.
Cast aluminum driver baskets resist flexing & “ring­ing” for ultra-tight bass and coloration-free midrange.
Ring Radiator Tweeters, for extended frequency
response, superior detail and transparency.
Rear

13 5/8" H x 8 5/8" W x 10 1/4" D (34.61cm H x 21.91cm W x 26.04cm D)
Overall Frequency Response 45Hz - 27kHz.

Stands courtesy of SanusSystems® (not included with speaker
purchase). Available for sale at shop.polkaudio.com.

See specifications for more detailed product information.

Cherry Ebony

i Series, sacrificing little to be the perfect

-firing Power Port for precise deep bass.

nal standing wave resonance can impart a “thick” or “chesty” character to the sound of voices. Polk Audio’s patented

A loudspeaker’
Acoustic Resonance Control Port System is tuned to cancel this resonance for utterly clear, accurate and natural midrange. See more about
Arc Port at www.polkaudio.com/catalog/technology/.

s inter

LSi Series

loudspeakers

www.PolkAudio.com / 800.377.7655 (USA & Canada) / 410.358.3600 (Worldwide) 5

polk

tech

nology

LSi Series: Loudspeakers For Serious Listeners

LSiW

The most advanced Polk Audio Powered Subwoofer
cally engineered to deliver bass with the accuracy and
depth demanded by the performance of the LS
The LS

iW features dual 10” long throw drivers mounted
on massive 1”-thick MDF baffles in a beautifully sculpted
cabinet of high gloss black and real wood veneer
input options and convenient front panel user controls
allow extreme flexibility.

Engineered for the ultimate musical bass response.
Solid construction for near-zero cabinet resonance.
Dual Long Throw Drivers for longer excursion
and better linearity and lower distortion.
Dual bass venting technologies: Polk’s patented
Power Port combined with Slot Load Venting
pumps out waves of thunderous, musical bass.

√ Magnetically shielded for safe placement

near TVs and video monitors.

Powered Subwoofer, Dual 10" Drivers, 400W Continuous Average Output
16 3/4" H x 17 1/8" W x 19 3/8" D (42.5cm H x 43.5cm W x 49.2cm D)
Overall Frequency Response 20Hz - 160Hz.

See specifications for more detailed product information.

Cherry Ebony

, specifi-

i Series.

. Multiple

LSi9s offer exceptional

“

performance for the price.

Home Theater Magazine,

April 2003

”

polk

LSiW

tech

nology

Polk Audio loudspeakers shatter the boundaries of bass r
air turbulence at the mouth of the port can cause “port noise” and bass output losses of up to 3dB. (A loss of 3dB means that half of your amplifier power
is being wasted on turbulence instead of bass!) The distinctive design of the Polk Audio Power Port gradually slows air exiting the port, vastly reducing
turbulence, por
you up—for a completely visceral and emotional movie and music experience.

6 Polk Audio LSi Series

t noise and ener

gy loss. The r

esult is bass that you will feel as well as hear; bass that r

esponse with patented Power Por

See mor

t bass venting technology. Conventional ports have limitations:

eaches out, grabs you by the lapels and shakes

e about Power Por

t at www.polkaudio.com/catalog/technology/.

LSiFX

This state-of-the-art bi-directional surround speaker deliv
ers effects so real they will astonish you. Engineered to
match the ultra-high performance of an LS
channel system, the LS
and Ring Radiator T
seamless integration into your high-end surround system.

Designed for high definition multi-channel formats
like DVD, SACD and DVD-Audio.

riangular cabinets produce a more realistically diffuse

T
wavefront and lifelike image of surround-sound FX.
Switchable Bipole/Dipole for placement flexibility.
Rear-firing Power Ports double as wall mounting
brackets; extend bass response for optimum perfor­mance in discrete channel systems.

15" H x 13-1/4" W x 10" D (38.10cm H x 33.66cm W x 25.40cm D)
Overall Frequency Response 40Hz - 27kHz.

See specifications for more detailed product information.

Ebony

iFX uses the identical 5 1/4” drivers

weeters as the rest of the LS

i Series multi-

i Series, for

LS

iC

-

Specially engineered to match the premium components
used in the ultra-high performance LS
ers, the LS

iC ensures absolutely seamless, lifelike imaging
across the front stage of your LS
tem. Superior Cascade T
the awesome Ring Radiator Tweeter, puts everyone in the
front row, no matter where they’re sitting.

Superior accuracy and theatrical impact for
the most sophisticated multi-channel systems.
(2) 5 1/4" drivers with Aerated Polypropylene Cones
for wide response and low distortion.
Timbre-matched with the LS
realistic surround sound experience.
Dual rear-firing Power Ports for surprising Center
Channel bass response.

7" H x 21-3/4" W x 9" D (17.78cm H x 55.24cm W x 22.86cm D)
Overall Frequency Response 40Hz - 27kHz.

See specifications for more detailed product information.

Ebony

i Series multi-channel sys-

apered Array Technology, featuring

i Series, for a seamless,

i Series Loudspeak-

LSiC

iC

LS

LSiFX

Use the Bipole/Dipole Sound Customization T
according to your theater setup and seating layout. Use the Dipole setting for a more diffuse, enveloping rear effects soundstage. Use the Bipole
setting to provide a more localized soundfield in discrete channel systems. Polk Audio Bi-Directional Surround Speakers give you the choice
of either polar patter
Bipole/Dipole at www

n so you can choose the one that sounds best to you in your set-up. Simply flip the convenient switch!

.polkaudio.com/catalog/technology/.

echnology of Polk Audio Bi-Dir

LSiC

ectional Surround Speakers to optimize your surround soundstage

e about

See mor

LSi Series

loudspeakers

www.PolkAudio.com / 800.377.7655 (USA & Canada) / 410.358.3600 (Worldwide) 7

LSi Series: Loudspeakers For Serious Listeners

LSi15 System

Here, the LSi15 Floorstanding Loudspeakers are perfectly
matched to the LS
directional Surround Speakers and the Polk Audio L
Powered Subwoofer. This is a multi-channel music and
home theater system of unusual power and precision
for audiophile systems in mid- to large-sized rooms.

LSi15 shown with Cherry veneer side panels. Ebony veneer side panels
also available. See specifications for mor

iC Center Channel Speaker, LSiFX Bi-

S

e detailed product information.

iW

multi-channel

audio systems

Front Speaker Center Surround Subwoofer

LSi25
LSi15 LSiCLSiFX or LSi9LSiW

LSi9LSi CLSi FX or LSi7LSi W
LSi7LSi CLSi 7LSi W

*The LSi25 features built-in powered subwoofers; an additional subwoofer is optional but recommended

ger rooms.

for lar

iC

LS

iFX or LSi 9

LS

iW*

LS

LSi15 System

equency response errors (called “comb filtering”) for off-axis

ence between the two drivers cr

Place two drivers near each other and inter
listeners; people sitting or standing of
of the listening area. Polk Audio multi-driver speakers combat this with “Cascade Tapered Array” crossovers. One driver is “crossed over” at a lower
frequency than the other driver, filtering out the frequencies where the interference will occur (thereby eliminating interference effects). The Cascade
Tapered Driver Arrays in Polk LSiC, LSi9, LSi15 and LSi25 speakers results in clearer, more detailed sound and uniform tonal balance throughout the
room. The sound is consistently accurate whether the listener is standing or sitting, in-line or off-axis. See more about Cascade Tapered Driver Array
at www.polkaudio.com/catalog/technology/.

8 Polk Audio LSi Series

fer

f to the side of the r

oom won’t hear the same tonal balance as listeners who are “on-axis” right in the center

eates fr

LSi7 System

If sound quality in a smaller system is important to
you, this LS
Bookshelf Loudspeakers (used as main and surround
speakers in this setup) with the LS
Speaker and the L
system will deliver true audiophile performance and
multi-channel excitement in small to mid-sized rooms.

LSi7 shown with Cherry veneer side panels. Ebony veneer side panels
also available. See specifications for more detailed product information.

Stands courtesy of SanusSystems® (not included with speaker purchase).
Available for sale at shop.polkaudio.com.

i7 Multi-Channel System matches the LSi7

iC Center Channel

S

i W Powered Subwoofer

. This

“

A real breakthrough in affordable
high-end products.”

The Absolute Sound,

April/May 2002

LSi7 System

Advanced laser imaging technology allowed Polk Audio engineers to see the entir
see the resonance develop on the speaker cones—resonance that is the root cause of loudspeaker distortion (A). Being able to see the resonance
develop, they deter
nance (B). Exclusive Dynamic Balance Composite Material Technology delivers sound that’s effortlessly clean and clear, even at lifelike volume.
See more about Dynamic Balance at www.polkaudio.com/catalog/technology/.

mined the “Dynamic Balance” of high-tech materials, geometr

e vibrating surface of a driver and tweeter; they could actually

eso

y and constr

uction that ef

fectively tune out the of

fending r

LSi Series

loudspeakers

www.PolkAudio.com / 800.377.7655 (USA & Canada) / 410.358.3600 (Worldwide) 9

-

A

B

product

specifications

Floorstanding Loudspeakers LSi25* LSi15*

Driver Complement

equency Response: Overall / -3dB Limits 20Hz - 27kHz / 30Hz - 26kHz 22Hz - 27kHz / 30Hz - 26kHz

Fr
Impedance compatible with 4 Ohm outputs compatible with 4 Ohm outputs
Recommended Amplification 20 - 300 watts/channel 20 - 250 watts/channel
Efficiency 88dB 88dB

1 - 10" (25.4cm) Dynamic Balance bass driver, 1 - 8" (20.3cm) Dynamic Balance bass driver,

1/4" (13.3cm) Dynamic Balance mid/bass drivers, 2 - 5 1/4" (13.3cm) Dynamic Balance mid/bass drivers,

2 - 5
1 - 1" (2.5cm) Dynamic Balance Ring Radiator tweeter

1 - 1" (2.5cm) Dynamic Balance Ring Radiator tweeter

Amplifier 150 watts into 8 Ohms n/a
Continuous Average Power** <1% THD, 30 - 200 Hz**(per enclosur

Subwoofer Amp Dynamic Power

vailable Finish high gloss black, Ebony or Cherry veneer side panels high gloss black, Ebony or Cherry veneer side panels

A

eight (+/- 3 lbs/kgs) 105 lbs/ea (47.6 kg) 75 lbs/ea (34 kg)

Shipping W
Cabinet Dimensions
(Including Grille & Binding Posts)
Base Dimensions 9 5/8" W x 16 3/8" D 9 11/16" W x 13 3/8" D

Features Power Port, Dual Gold-Plated 5-Way Binding Posts, Power Port, Dual Gold-Plated 5-Way Binding Posts,

Bookshelf Loudspeakers LSi9* LSi7*

Driver Complement 2 - 5 1/4" (13.3cm) Dynamic Balance mid/bass driver 1 - 5 1/4" (13.3cm) Dynamic Balance mid/bass drivers

Frequency Response: Overall / -3dB Limits 38Hz - 27kHz / 50Hz - 26kHz 45Hz - 27kHz / 53Hz - 26kHz
Impedance compatible with 4 Ohm outputs compatible with 4 Ohm outputs
Recommended Amplification
Efficiency 88dB 88dB
Available Finish high gloss black, Ebony or Cherry veneer side panels high gloss black, Ebony or Cherry veneer side panels
Shipping Weight (+/- 3 lbs/kgs) 75 lbs/pr (34.0 kg) 50 lbs/pr (22.7 kg)
Dimensions 14 7/8" Hx 8 5/8" W x 15 1/4" D 13 5/8" H x 8 5/8" W x 10 1/4" D

Features Power Port, Dual Gold-Plated 5-Way Binding Posts, Power Port, Dual Gold-Plated 5-Way Binding Posts,

300 watts (per enclosure) n/a

49 3/4" Hx 8 5/8" W x 17"D 45 1/2" H x 8 5/8" W x 13" D

126.36cm H x 21.91cm W x 43.18cm D 115.6cm H x 21.9cm W x 33.0cm D

24.6cm W x 41.6cm D 24.6cm W x 34cm D

ARC Port, ARC Port, Bi-Amp/Bi-Wire Terminals,
Magnetic Shielding, 110V only Magnetic Shielding

1 - 1" (2.5cm) Dynamic Balance Ring Radiator tweeter 1 - 1" (2.5cm) Dynamic Balance Ring Radiator tweeter

20 - 200 watts/channel

37.8cm H x 21.9cm W x 38.7cm D 34.61cm H x 21.91cm W x 26.04cm

Magnetic Shielding, ARC Port, Bi-Amp/Bi-Wire Terminals Magnetic Shielding, ARC Port, Bi-Amp/Bi-Wire Terminals

e)

20 - 150 watts/channel

* Magnetically shielded components for safe placement near TVs or video monitors.

** About Power Ratings:
The Federal Trade Commission has issued new regulations regarding the power ratings of all amplifiers, including self-powered speakers. Polk Audio supports this effort to standardize
power testing methods in order to provide consumers with a “level playing field” basis for comparison. Note, however, that the FTC rating is based on the “Continuous Power” output of the

. Music and movies ar

amplifier
amplifier to produce power in short bursts similar to those found in music and movies. In our experience, an amplifier with higher Dynamic Power output will play louder under most conditions
regardless of the continuous power rating.

“Polk Audio,” “The Speaker Specialists,” “ARC Port,” “Casket Basket,” and “Dynamic Balance” are trademarks of Britannia Investment Corporation used under license by Polk Audio Inc.

10 Polk Audio LSi Series

e rarely “continuous” but are mainly composed of short bursts of sound. For this reason we also supply a “Dynamic Power” rating that measures the ability of the

Surround & Center Loudspeakers LSiFX LSiC

Driver Complement

equency Response: Overall / -3dB Limits 40Hz - 27kHz / 52Hz - 26kHz 40Hz - 27kHz / 52Hz - 26kHz

Fr
Impedance
Recommended Amplification 20 - 200 watts/channel 20 - 200 watts/channel
Efficiency 88dB 88dB
Available Finish high gloss black high gloss black

eight (+/- 3 lbs/kgs) 55 lbs/pr (24.9 kg) 25 lbs/ea (11.3 kg)

Shipping W
Dimensions

es Switchable Bipole/Dipole, Power Port, ARC Port,

Featur

Powered Subwoofers LSiW*

Driver Complement 2 - 10" (25cm) woofers

2 - 5 1/4" (13.3cm) Dynamic Balance mid/bass drivers, 2 - 5 1/4" (13.3cm) Dynamic Balance mid/bass drivers,
2 - 1" (2.5cm) Dynamic Balance Ring Radiator tweeters

compatible with 4 Ohm outputs compatible with 4 Ohm outputs

15"H x 13 1/4"W x 10"D 7"H x 21 3/4"W x 9"D

38.1cm H x 33.6cm W x 25.4cm D

t, Dual Gold-Plated 5-Way Binding Posts Magnetic Shielding, Dual Gold-Plated 5-Way Binding Posts

Power Por
Bi-Amp/Bi-W

ire Terminals Bi-Amp/Bi-Wire Terminals

1 - 1" (2.5cm) Dynamic Balance Ring Radiator tweeter

17.8cm H x 55.2cm W x 22.8cm D

Amplifier 400 watts into 2 Ohms
Continuous Average Power** with <1% THD, 20 - 145Hz**

Subwoofer Amp Dynamic Power 825 watts
Port Type Slot Loaded Power Port
Frequency Response: Overall / -3dB Limits 20Hz - 160Hz / 30Hz - 125Hz
Crossover Frequency adjustable 50Hz - 140Hz
Inputs speaker, line level & LFE
Outputs speaker & line level/speaker level 80Hz highpass filter
Available Finish high gloss black, Ebony or Cherry side panels

eight (+/- 3 lbs/kgs)

Shipping W
Dimensions 16 3/4" H x 16 7/8"W x 19 3/8"D
(Including Grille, Heat Sink, Binding Posts) 42.5cm H x 42.8cm W x 49.2cm D
Features Auto On/Off, Unfiltered LFE Input, Power Port,

81 lbs/ea (36.7 kg)

Magnetic Shielding, Speaker & Low Level Inputs,
Dual Gold-Plated 5-Way Binding Posts,
Front Panel Volume & Crossover Controls,
+3 db Bass Boost, 1 1/2" Cabinet Baffles

LSi Series

loudspeakers

www.PolkAudio.com / 800.377.7655 (USA & Canada) / 410.358.3600 (Worldwide) 11

Founded in 1972, Polk Audio is an internationally renowned designer and manufacturer of high
quality, high performance home and car loudspeakers based in Baltimore, Maryland. Polk Audio
loudspeakers benefit from over 55 patents for loudspeaker technology, and earn
consistently great reviews in the worldwide audio press for sound quality and innovation. Polk
products are distributed throughout the US and Canada and in over 50 international markets by
authorized local importer-distributors. Contact Polk Audio at 800-377-7655 or via email:
[e-mail]

To find out about Polk Audio exclusive technologies,
go to www.polkaudio.com/catalog/technology/.

For FAQs, a wealth of advice and educational
materials go to www.polkaudio.com/catalog/faq/.

For System Builder and other interactive tools
go to www.polkaudio.com/catalog/toolbox/.

For archived Polk Audio Newspapers,Handbooks,
online product manuals, and professional reviews
go to www.polkaudio.com/catalog/library/.

For performance accessories and official Polk
logowear,go to shop.polkaudio.com/.

Matthew Polk,

Speaker Specialist,

Polk Audio Co-Founder.

Polk Audio

5601 Metro Drive

Baltimore, MD 21215

800-377-7655
410-358-3600

.polkaudio.com

www

Copyright© February 2004

All rights reserved.

12 Polk Audio LSi Series

RP2105-1