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The Polk Audio LSi-M705

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Floorstanding Speakers.

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Superior performance floor-standing tower

  • Dynamic Sonic Engine
  • Dual woofers

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.


  • Total Pieces


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


  • Carton 1
    86.4 lbs (39.19 kg)


  • Qty Included
  • Height with Base
    47" (119.38 cm)
  • Width with Base
    8.31" (21.11 cm)
  • Depth with Base
    14.38" (36.53 cm)
  • Weight
    78 lbs (35.38 kg)
  • Base Width
    9.25" (23.5 cm)
  • Base Depth
    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


  • Total Frequency Response
    22 Hz → 40 kHz
  • Lower and Upper -3dB Limits
    42 Hz → 30 kHz


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

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.

Download the LSiM Series Datasheet.

Learn more about the incredible Polk Audio LSiM Series Speakers. Read More about the LSiM Series.

The T's and the C's.

Product information is supplied in good faith.
Products and specifications are subject to change without notice.
Prices are subject to change without notice.
E&OE, errors and ommissions excepted.