Polk Audio LSiM704c | Midnight Mahogany Center Speaker


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Details & Highlights

Product Highlights

    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 youa??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.

Details from Polk Audio

    Thinking of skimping on the center channel speaker? Don’t do it. Slightly smaller than the flagship LSiM706c, this high performance center channel speaker anchors the action in home theater systems based around the smaller LSiM floorstanding model (LSiM705) or LSiM bookshelf model (LSiM703). The LSiM704c makes a massive impact and reveals sparkling pinpoint details, with a wide soundstage and deep bass reproduction. It puts you in the center of the action!

    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.


Features & Specs

Best Seller
Manufacturer's Warranty
    5 Years Parts / 5 Years Labor
Detailed Specifications
    Driver Complement
  • Quantity 1
  • Diameter 1" (2.54cm)
  • Type Dynamic Balance enhanced ring radiator tweeter
  • Midrange
  • Quantity 1
  • Diameter 3 1/4" (8.26cm)
  • Type Dynamic Balance driver with super cell aerated polypropylene cone
  • Mid / Woofer
  • Quantity 2
  • Diameter 5 1/4" (13.34cm)
  • Type Dynamic Balance driver with super cell aerated polypropylene cone

  • Electrical
  • Total Frequency Response 40Hz-40kHz
  • Upper -3dB Limit 30 kHz
  • Lower -3dB Limit 70 Hz
  • Nominal Impedance 8 ohms
  • Efficiency 88 dB
  • Crossover
  • Type Orth crossover design
  • Tweeter/midrange Crossover Frequency 2.5 kHz
  • Midrange/midbass Crossover Frequency 280 Hz
  • Recommended Amplifier Power 20-200 watts per channel
  • Inputs Dual gold-plated binding posts

  • DimensionsCabinet Dimensions
  • Height 7 3/4" (19.68cm)
  • Width 21 3/16" (53.82cm)
  • Depth 9 3/8" (23.81cm)
  • Enclosure Type
  • Mid-High Array Enclosure Type Sealed
  • Midwoofer Enclosure Type Dual PowerPort bass venting
  • Product Weight (each) 29.1 pounds

  • Shipping
  • Unit of Measure Each
  • Included Accessories Binding post jumpers; Owners manual, Registration card

  • Warranty
  • Speaker Warranty 5 years parts and labor (original purchaser)
Product Bullets


Included Coverage from Polk Audio: 5 Years Parts / 5 Years Labor

Category ID: 56 | $749.95