Polk Audio Polk Audio LSi M707 Floor Standing Speaker, 20Hz-40kHz Frequency Response, Midnight Mahogany

Polk Audio
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Polk Audio M707: Picture 1 regular $1,999.95

About Polk Audio M707

The Polk Audio LSi M 707 Floor Standing Speaker (Midnight Mahogany) incorporates the latest developments in speaker technology, fitted into a newly designed enclosure that's beautifully sculpted and luxuriously finished. The heart of the LSi M 707 is Polk's Dynamic Sonic Engine. Made up of a 3-1/4" midrange driver and a 1" ring radiator tweeter in its own acoustically sealed enclosure, this tightly spaced duo acts like a "mini-monitor." The precise alignment of the midrange and tweeter allows them to disperse sound over a wide, uniform area with excellent off-axis response in the critical 200 Hz to 2,000 Hz midrange.

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. It even has its own tuned enclosure within the Dynamic Sonic Engine. These changes result in higher power handling, extended dynamic range, improved dispersion and extended high-frequency response - all the way up to 30,000 Hz

The LSi M 707 features a 4-way design, meaning that the tweeter handles only the highest of frequencies, the midrange handles the middle frequencies, the midbass handles the mid to low frequencies and the woofers handle only the lowest frequencies. This separation allows each driver to perform within its optimum range, meaning you'll hear sound with absolute clarity and stunning impact. And this speaker uses proprietary Orth Crossovers, making it extremely efficient and easier for your receiver or amplifier to drive.

Polk Audio M707 Features

  • Dynamic Sonic Engine (Driver and Tweeter): The heart of the new LSi M707 is this incredible enclosure-within-the-enclosure, the Dynamic Sonic Engine, that houses the mid-range driver and the Ring Radiator Tweeter
  • Enhanced Ring Radiator Tweeter: This tweeter was a vital element in the success of the original LSi M707. It is made some nuanced improvements in the design of this tweeter
  • Cassini Oval Subwoofer Drivers: Oval shapes increase surface area for deeper, more musical low-frequency response, while allowing for a narrower baffle design. Overhung Voice Coil designs allow larger excursions and higher power handling. Bass is deep and blending is smooth
  • Super Cell Aerated Polypropylene Cone Material: If the perfect cone material is lightweight, 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
  • Butyl Rubber Surrounds: Durable, soft, injection-molded butyl rubber surrounds are tuned to absorb and suppress unwanted cone resonances. 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
  • Orth Crossovers: 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
  • 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
  • Timbre-Matched Series: 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
  • Rubber Trim Finishes: Beautiful furniture-grade fit and finish, with no visible screws

Polk Audio M707 Specifications

Subwoofer Diameter
2 - 6" Diameter (15.24cm)
Subwoofer Type
Dynamic Balance Cassini Ovals with Super Cell Aerated Polypropylene diaphragms
Mid/Woofer Diameter
1 - 6 1/2" Diameter (16.51cm)
Mid/Woofer Type
Dynamic Balance driver with Super Cell Aerated Polypropylene cone
Midrange Diameter
1 - 3 1/4" Diameter (8.26cm)
Midrange Type
Dynamic Balance driver with Super Cell Aerated Polypropylene cone
Tweeter Diameter
1 - 1" Diameter (2.54cm)
Tweeter Type
Dynamic Balance Enhanced Ring Radiator Tweeter
Overall Frequency Response
Lower -3dB Limit
38Hz dB
Upper -3dB Limit
30kHz dB
Nominal Impedance
Compatible with 8 ohm outputs ohms
Recommended Amplifier Power
20-300 w/channel
88 dB
Crossover: Type
Orth Crossover
Crossover(mid-high array)
Dual Gold-Plated Binding Posts
Mounting Options
Enclosure Type
Enclosure Type(subwoofer)
Dual PowerPort
Cabinet: 50.81 x 9.5 x 18.43" / 129.06 x 24.13 x 46.83 cm
Footprint: 10.5 x 20.31" / 26.67 x 51.59 cm
Mfr #
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