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Polk Audio LSi25

Powered floor-standing speakers (Cherry finish)

Item # 700LSI25C

Other details include two sets of gold-plated 5-way binding posts for biamping or biwiring, and adjustable spikes...

Other details include two sets of gold-plated 5-way binding posts for biamping or biwiring, and adjustable spikes...

Carlos
Need help?
Contact our Virginia-based experts.
Discontinued item

Item # 700LSI25C

Carlos
Need help?
Contact our Virginia-based experts.

About the Polk Audio LSi25

Tower speakers with built-in powered subwoofers

Other details include two sets of gold-plated 5-way binding posts for biamping or biwiring, and adjustable spikes for carpeted or hardwood floors. When it comes to home theater, a powerful performer like the LSi25 is hard to beat. Start with an LSi25 pair as front left and right speakers, and other LSi speakers to round out your multichannel setup.

Tower speakers with built-in powered subwoofers

If you "really want deep bass, want a speaker for music and home theater purposes, or want maximum dynamic range for orchestral, jazz, and rock, go with the LSi25," advises reviewer Anthony H. Cordesman (The Absolute Sound, April/May 2002). Why is this speaker so highly recommended? Because the LSi25, along with delivering stunning audiophile-quality sound, also boasts a powered subwoofer in each tower.

LSi Lifestyle

Crystal-clear highs and smooth mids

Exploded speaker

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

A big part of the LSi25's incredible sound is the 1" Ring Radiator tweeter. This sophisticated tweeter reproduces highs beautifully, for transparent, natural sound. The LSi25 also comes with two 5-1/4" aerated polypropylene Dynamic Balance® mid/bass drivers. These drivers team up with Acoustic Resonance Control (ARC) technology, for vocals and midrange that come alive in your room. And Polk has devoted a lot of attention to cabinet design, so that unwanted resonances are eliminated — your sound stays smooth and clear. Finally, the anti-diffraction grilles help bring you a wide-open soundstage with pristine imaging.


subwoofer

Save your floor-space with a built in subwoofer.

Clear, punchy bass

Polk's packed a 150-watt RMS amplifier into each LSi25 tower; each amp drives a 10" Dynamic Balance® woofer, to provide ultra-responsive bass with precision and punch. Power Port venting makes your bass even more expansive — it's rare to hear lows this intense from a tower speaker.


Works well in either a stereo or multi-channel setup

Other details include two sets of gold-plated 5-way binding posts for biamping or biwiring, and adjustable spikes for carpeted or hardwood floors. When it comes to home theater, a powerful performer like the LSi25 is hard to beat. Start with an LSi25 pair as front left and right speakers, and other LSi speakers to round out your multichannel setup.

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

READ LESS

Product highlights:

  • video-shielded
  • bass-reflex design
  • frequency response 30-26,000 Hz (-3dB)
  • 4-ohm impedance; these speakers must be powered using high-current amplification
  • sensitivity 88 dB
  • handles up to 300 watts
  • 150-watt RMS amplifier per enclosure with auto on/off
  • independent subwoofer volume control on each tower
  • real wood veneer
  • dual 5-way, gold-plated binding post terminals
  • 9-11/16"W x 48-3/8"H x 17"D (with pedestal)
  • warranty: 5 years drivers, 3 years amp
  • Our 60-day money-back guarantee
  • MFR # LSi25 Cherry Pair

What's in the box:

  • Two separate boxes (Left-Channel box and Right-Channel box)
  • The Left-Channel box contains:
  • 1 Cherry left-channel floor-standing speaker with attached pedestal
  • 4 Carpet spikes with installed rubber feet
  • Owner's Manual
  • Product Registration Card
  • "Register Online" sheet
  • The Right-Channel box contains:
  • 1 Cherry right-channel floor-standing speaker with attached pedestal
  • 4 Carpet spikes with installed rubber feet
  • Product Registration Card

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Polk Audio LSi25 reviews

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More details on the Polk Audio LSi25

Stacey B.

Features & specs

General
Enclosure Bass Reflex
Finish Wood veneer
Color Cherry
Tweeter Ring Radiator
Tweeter Size (inches) 1
Midrange Size (inches) 5.25
Woofer Size (inches) 10
Woofer Composition Poly
Woofer Surround Rubber
Built-in Powered Sub Yes
Dolby Atmos Drivers
Connector Type 5-way post
Bi-amp Inputs Yes
Parts Warranty 5Yrs/3Yrs
Labor Warranty 5Yrs/3Yrs
Specifications
Power Range 20-300
Frequency Response 30-26k Hz
Sensitivity 88 dB
Impedance (Ohms) 4
Subwoofer Amp Power 150
Height (inches) ---
Width (inches) ---
Depth (inches) ---
Weight ---

Product Research

Features
Inputs and Output Notes
Miscellaneous Notes and Specifications

Features

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.

Powered Subwoofers: On the lower portion of the one of the side panels, these speakers have a side-firing 10" poly cone woofer with a rubber surround for deep bass response. It is powered by an internal 150 watt RMS amplifier. The powered subwoofer utilizes a 2nd order (12dB/octave) low pass filter, variable from 60Hz-180Hz. Note: These speakers are a "mirror image" of each other. The side-firing subwoofer on the left channel speaker is on the left side panel, while the woofer on the right channel speaker is on the right side panel.

Aerated Polypropylene Midranges: The speaker uses two Aerated Polypropylene midrange cones for wide response and low distortion. For superior durability, the midranges use rubber surrounds.

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

Power Port Venting System: This speaker has a floor-coupled Power Port venting system built into its pedestal 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.

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, this speaker has two front-firing ports that are tuned to suppress the internal cabinet resonance, resulting in smooth, natural midrange reproduction.

Low-diffraction Grilles: This speaker employs open architecture low-diffraction grilles for spacious imaging.

Carpet Spikes: When the spikes, along with the rubber feet, are installed, the speaker height increases to 49-7/16". With the spikes installed and the rubber feet removed, the speaker height is 48-3/8".

Inputs and Output Notes

Dual 5-Way Binding Posts: This 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 speaker. Note: You will need to remove the jumpers if you are using the subwoofer's line level input.

Line Input Options: The powered subwoofer has two sets of line-level inputs: a filtered input (Line In) and an unfiltered input (LFE In). When the unfiltered input is used, the signal bypasses the internal low pass crossover, and relies on the crossover from the receiver/processor's LFE (Low Frequency Effects) output. When the filtered input is used, the speaker's variable low pass crossover is active. In addition, there is a line level pass-through output allowing you to daisy-chain the two speakers or send signal to a separate powered subwoofer.

Miscellaneous Notes and Specifications

Warranty: The warranty for the drivers is 5 years parts and labor. The warranty for the subwoofer amplifier is 3 years parts and labor.

Frequency Response: The overall frequency response is 20Hz-27kHz and the -3dB frequency response is 30-26kHz.

Weight: Each speaker weighs 91 pounds.

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