Center Channel

LSiM704c

The Smaller LSiM Center Channel Speaker

W x H x D

Price

$74995each

Available Finishes:
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The All-Star Center

Tired of turning your system up to hear the dialog and down because the effects are too loud? Then put your money in a high performance center channel speaker like the LSiM704c. Big enough to stand up to the power of the floorstanding LSiM705 or the LSiM703 bookshelf loudspeaker, you can use this center channel speaker to perfectly match the size and performance you’re looking for. The LSiM704c has all the earmarks of a great center: crystalline detail, fast natural midrange and impactful bass. With its dynamic sonic engine, twin 5 1/4-inch woofers and a dual PowerPort® venting system, the LSiM704c will reveal the whisper, the shout and the thump-thump of the helicopter flying over.

LSiM704c Features:

Polk’s exclusive dynamic sonic engine design optimizes the midrange driver and the ring radiator tweeter in separate interior chambers for improved transient response, superior imaging and greater horizontal off-axis response.

Enhanced, reengineered ring radiator tweeters extend top-end response for incredible details and realistic imaging.

Our innovative overhung voice coil design augments the excursion length for subwoofer drivers, increasing their power-handling capabilities and enhancing bass response.

Extended Linear Motion voice coil design allows lots of movement in a limited space, eliminating impedance and extending mid- and high-frequency response.

Lightweight, rigid cast aluminum baskets are designed for precision motor alignment with unobstructed linear movement and ample venting.

Klippel motor optimization uses laser measurement technology to ensure a smooth excursion path at either end of the volume spectrum for uniform performance at both low and high volumes.

Polk’s proprietary, patented Dynamic Balance® technology allows our engineers to design out distortion-causing driver and system resonances, so you only hear the good sounds.

Our super cell aerated polypropylene cone is the ideal balance of lightweight stiffness (for more efficient action with less distortion-causing flex) and superior damping properties.

Durable, computer-modeled, injection-molded butyl rubber surrounds suppress unwanted cone resonances for a lifetime of reliable sound.

High quality, heavy duty LSiM enclosure construction features 1.0" MDF on the sides, 3/4" MDF on the back and bottom and 1 1/4-inch baffles with substantial internal bracing and separate interior cabinetry for each driver. These exceptionally robust materials efficiently eliminate cabinet resonances and standing waves for less distortion and more dynamic transparency.

Beautiful furniture-grade hardwood veneer cabinet finishes, with sleek trim accents and no visible screws.

Super-thin zero-diffraction grilles lock in place magnetically, and never obscure your sound.

PowerPort® bass venting is Polk’s patented design for smoothly transitioning the air flow from the port into your listening area, eliminating turbulence and distortion, for bigger, more efficient, deep bass impact.

All Polk loudspeakers are timbre-matched within their series, designed with the same components throughout, to achieve seamless speaker-to-speaker blending effects in multi-channel systems.

Dual gold-plated, professional-style 5-way binding posts, for the most secure connection options.

Dual binding posts allow bi-amp or bi-wire connections, for the ultimate in customized high performance audio.

All Polk products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk loudspeakers are built to perform for a lifetime.

Driver Complement

Tweeter
Quantity
Diameter1" (2.54cm) 
TypeDynamic Balance enhanced ring radiator tweeter  
Midrange
Quantity
Diameter3 1/4" (8.26cm) 
TypeDynamic Balance driver with super cell aerated polypropylene cone 
Mid / Woofer
Quantity
Diameter5 1/4" (13.34cm) 
TypeDynamic Balance driver with super cell aerated polypropylene cone 

Electrical

Total Frequency Response40Hz-40kHz 
Upper -3dB Limit30 kHz
Lower -3dB Limit70 Hz
Nominal Impedance8 ohms
Efficiency88 dB
Crossover
TypeOrth crossover design 
Tweeter/midrange
Crossover Frequency
2.5 kHz
Midrange/midbass
Crossover Frequency
280 Hz
Recommended Amplifier Power20-200 watts per channel
InputsDual gold-plated binding posts 

Dimensions

Enclosure Type
Mid-High Array Enclosure TypeSealed 
Midwoofer Enclosure TypeDual PowerPort bass venting 
Product Weight (each)27.8 pounds

Shipping

Unit of MeasureEach 
Total Shipping Weight29.1 pounds
Included AccessoriesBinding post jumpers; Owners manual, Registration card 

Warranty

Speaker Warranty5 years parts and labor (original purchaser) 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

LSiM704c Media

LSiM704c Accessories