Superior performance floor-standing tower

  • Dynamic Sonic Engine
  • Dual woofers
  • 1,499.95 Each
Add to Cart
  • 1,499.95 Each
Add to Cart
  • Free ground shipping on all orders

High Quality Sound

Fills your world with its wide, dynamic soundstage and its capability to effortlessly achieve truly staggering volume levels. The LSiM705 includes a 5 1/4-inch mid-woofer of lightweight super cell aerated polypropylene for smooth blending with its dual 5x7-inch Cassini oval subwoofer radiators enhanced by Polk's patented PowerPort® bass venting.

Accurate dialogue

The ring radiator tweeter features several improvements from the version in the earlier LSi line. A slight reshaping of the tweeter's bullet-shaped phase plug allows it to move even farther out of the baffle, while a redesigned diaphragm has made the tweeter even more efficient.

Advanced driver material

The original LSi speakers featured a light, stiff mineral-filled polypropylene cone that was "puffed up" with injected air to form a honeycomb-like structure. The new super cell aerated polypropylene uses larger "puffed cells" to create a cone material that's thicker yet lighter than the original.

Dual woofers

The oval shape helps them produce tight low-frequency music and movie sounds while maintaining a narrow cabinet width. Plus, each woofer has its own PowerPort® — a unique Polk design that positions specially designed "cones" at the mouth of the bass ports to direct moving air to eliminate bass-stealing turbulence.

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Tech Specs


  • Total Pieces


  • Cabinet Warranty
    5 years
  • Drivers Warranty
    5 years
  • Original Purchaser Only

Shipping Cartons

  • Carton 1
    86.4 lbs (39.19 kg)

Floor Standing Speaker

  • Qty Included
  • Availability
  • Height
    47" (119.38 cm)
  • Width without Base
    8.31" (21.11 cm)
  • Depth without Base
    14.38" (36.53 cm)
  • Weight
    78 lbs (35.38 kg)
  • Width with Base
    9.25" (23.5 cm)
  • Depth with Base
    16.25" (41.28 cm)
  • Driver Enclosure Type
  • Driver Complement
    • (1)  3.25" (8.26 cm) d (Round) Super Cell Aerated Polypropylene - Mid/Woofer
    • (2)  5" (12.7 cm) d (Round) Super Cell Aerated Polypropylene - Midrange
    • (2)  7" (17.78 cm) h x 5" (12.7 cm) w (Oval) Cassini oval, Super Cell Aerated Polypropylene - Subwoofer
    • (1)  1" (2.54 cm) d (Round) Enhanced Ring Radiator - Tweeter
  • Enclosure Type
    Mid-High Array Enclosure Type: Sealed
  • Enclosure Type
    Subwoofer Enclosure Type: Dual PowerPort bass venting

Audio Quality

  • Total Frequency Response
    22 Hz → 40,000 Hz
  • Nominal Impedance
    8 ohms
  • Lower and Upper -3dB Limits
    42 Hz → 30,000 Hz


  • Type
    Orth Crossover Design
  • Midrange/Woofer Crossover Frequency
    100 Hz
  • Tweeter/Midrange Crossover Frequency
    2800 Hz
  • A/V Receiver Crossover Settings
    (40 Hz)

External Amplifier

  • Recommended Amplifier Power Per Channel
    20 watts → 250 watts
Q & A