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High Performance Bookshelf Loudspeaker
16 3/4" H x 8" W x 14 9/16" D
( (42.55cm) H x (20.32cm) W x (36.99cm) D )
Radical, realistic, remarkable performance in a bookshelf loudspeaker for 2-channel music or a powerful multi-channel home theater system. This is the bookshelf loudspeaker that delivers it all.
The New Bookshelf for Serious Listening
With the performance of the groundbreaking LSiM Series in a smaller, more flexible bookshelf-speaker format, the LSiM703 gives you the best of all worlds.
Dynamic Sonic Engine (Driver and Tweeter)
The heart of the new LSiM Series is this incredible enclosure-within-the-enclosure, the Dynamic Sonic Engine, that houses the mid-range driver and the Ring Radiator Tweeter. Molded in one rigid piece, the DSE enclosure tapers to a "turbine" that reduces back-wave reflections. The DSE combines its two speakers in an aligned, optimized array for wide, uniform dispersion in the critical 200Hz-2kHz midrange, improving transient response; the combination delivers exact timbre-matching, improved high-frequency dispersion and greater horizontal off-axis response
Enhanced Ring Radiator Tweeter
This tweeter was a vital element in the success of the original LSi Series. Yet, that wasn't good enough for the engineers designing the new LSiM Series. They've made some nuanced improvements in the design of this tweeter. First, they reshaped the tweeter's bullet-shaped phase plug, allowing it to move farther out of the baffle, improving dispersion and eliminating horn-loading. Next, they opened up the tweeter's face-plate, then redesigned the tweeter's diaphragm roll to make it more efficient and improve dispersion even more. Finally, they gave their new Ring Radiator Tweeter its own tuned enclosure in the exclusive Dynamic Sonic Engine. This new Ring Radiator boasts higher power handling, extended dynamic range, improved dispersion and extended top-end response.
Super Cell Aerated Polypropylene Cone Material
If the perfect cone material is lightweight (for faster, more efficient action) and stiff (for less distortion-causing flex), with enough internal damping to suppress and offset any limitations of its lightweight stiffness, then the Super Cell APP Cone Material is about as perfect as cone material gets. Aerated Polypropylene (APP) is a mineral-filled polypropylene material that's been "puffed up" with injected air to form a honey-comb structure. Our original APP cone approaches the ideal balance of lightweight stiffness with high damping, along with good resistance to moisture, UV and temperature extremes. Next Gen LSiM Series Loudspeakers employ our next gen APP Super Cell. In Super Cell APP, the "puffed cells" are larger, for a thicker cone material that actually has less mass than the original APP material. Super Cell APP has larger cells, for lighter weight and more inherent damping, plus uncompromised stiffness, for unsurpassed transient response and resonance suppression.
Butyl Rubber Surrounds
Durable, soft, injection-molded butyl rubber surrounds are tuned to absorb and suppress unwanted cone resonances. Our new rubber material is impervious to UV, extreme temps and humidity, for a lifetime of smooth, reliable sound.
Extended Linear Motion Voice Coils
Allowing lots of movement in a limited space, ELM Voice Coils power the LSiM mid-range and mid-woofer drivers to extend their higher-frequency response with much less impedance. (LSiM Subwoofers use Overhung Coils, which allow the larger excursions and greater power handling necessary for big subwoofer performance.)
Cast Aluminum Baskets
These lightweight, splayed-strut design baskets provide a rigid structure for precise alignment of the speaker's active parts, for flat response and low distortion, with no mechanical resonances or ringing. The open design provides ample venting for unobstructed linear movement.
Proprietary engineering, designed and patented by Polk Audio to maintain a lower order crossover design and increase power handling. Orth Crossovers feature Mylar and Polypropylene Capacitors for sparkling highs and Air Core Inductors for superior transparency. Notch Filters and sophisticated Zobel circuits smooth the impedance curve of the system for more efficiency and better high frequency response.
The LSiM Enclosure
The enclosure is an integral part of the sound design of the new LSiM Series. All LSiM cabinets are made of 1.0" MDF on the sides, 3/4" MDF on the back and bottom, with wide-radius baffles of robust 1 1/4" MDF. Substantial internal bracing, each driver with its own separate non-parallel chamber, increases efficiency and banishes internal resonances and standing waves, for high power handling and incredible smoothness. Wide-radius baffles, along with zero-diffraction magnetic grilles, help stabilize imaging for a very wide, well-defined soundstage.
Zero-Diffraction Magnetic Grilles
Super thin 1mm, zero-diffraction grilles have no measurable effect on the speaker's response. Completely unobtrusive, stylishly sheer, these grilles lock in place magnetically.
PowerPort Bass Venting
Patented Polk Audio technology that uses a specially designed "cone" at the mouth of the bass port to direct moving air as it exits the port. Air moving out of a bass port creates turbulence, which can result in boomy distortion and "port noise," especially at high volume. This distortion can cause bass output losses up to 3dB, wasting lots of amp power. To eliminate bass-stealing turbulence at the mouth of the port, Polk Audio engineers designed the PowerPort. It's unique shape promotes "laminar" airflow even in short tube ports by mimicking the properties of longer, flared port openings. No turbulence means no wasted power, which means more efficient bass response.
Achieve incredible realism and seamless surround effects when you build a complete LSiM system. All models feature the same components and tuning.
Dual Metal Gold-Plated 5-Way Binding Posts
For the most professional, secure connections.
Bi-Amp or Bi-Wire Capability
For the ultimate in high performance, customizable audio.
Innovative Hex-Head Floor Spikes
Level your towers without having to tip them.
Rubber Trim Finishes
Beautiful furniture-grade fit and finish, with no visible screws.
Famous Polk Dependability & Durability
Like all of our products, the LSiM Series uses only the best materials coupled with the most advanced manufacturing techniques on the planet. All Polk products must pass a battery of the most physically strenuous and exhaustive performance tests in the industry, including drop testing and extreme signal response testing. Polk Audio loudspeakers are built to perform for a lifetime.
Polk Audio Customer Service: The Gold Standard
Call or email us and you'll be connected to a real live human who knows just about everything there is to know about audio and performance electronics. From "how do I get started?" and "what should I buy?" to "how do I stop that hiss?" and "which tube needs replacing?" and everything in between, we know the answers you need to get back to enjoying your audio entertainment pronto. Just ask.
Mid/Woofer 1 - 6 1/2" Diameter (16.51cm)
Dynamic Balance driver with Super Cell Areated Polypropylene cone
Midrange 1 - 3 1/4" Diameter (8.26cm)
Dynamic Balance driver with Super Cell Aerated Polypropylene cone
Tweeter 1 - 1" Diameter (2.54cm)
Enhanced Ring Radiator Dynamic Balance tweeter
Overall Frequency Response 36Hz-40kHz
Lower -3dB Limit 50Hz dB
Upper -3dB Limit 30kHz dB
Nominal Impedance compatible with 8 ohm outputs ohms
Recommended Amplifier Power 20-200 w/channel
Efficiency 88 dB
Crossover Orth Crossover
(mid-high array) 2800HZ
Inputs Dual Gold-Plated Binding Posts
Cabinet Size 16 3/4" H x 8" W x 14 9/16" D
(42.55cm H x 20.32cm W x 36.99cm D)
Mounting Options speaker stands or shelf mount
Enclosure Type Sealed
(subwoofer) PowerPort bass venting
Product Weight 29.60 lbs. (13.43kgs)
Shipping unit: each
Total Shipping Weight 32.50 lbs. (14.74kgs)