Polk Audio is featuring, in its 2011 Rocky Mountain Audio Fest exhibit, a demonstration of its new top-of-the-line home audio speaker series. The new LSiM series reportedly utilizes Polk's most advanced engineering to date.

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"We're happy to report that the new LSiM reference line is just now shipping to our dealers," says Polk's Vice President of Product Line Management, Mark Suskind. "The LSi line has been Polk's flagship selection for almost a decade, and the new LSiM series further ups the ante, making it the most advanced speaker line we've built in our 40 year history."

The new Polk LSiM series encompasses a full range of tower, bookshelf, center and surround channel models. The performance objectives for the series were set with a high bar - open, transparent, three-dimensional sound, with accurate tonal and temporal response and compatibility with a broad range of past, present and future electronics.

Standing front and center in Polk's exhibit are two 4-way floor-standing tower models, the LSiM 707 and LSiM 705, the latter of which will be demonstrated at RMAF. Each tower features transducers built with Polk's Dynamic Balance design technology, which combines the latest in composite materials and computer-assisted geometry to create drivers with reportedly low distortions and artifacts. Both towers sport an array of these drivers, highlighted by Polk's Dynamic Sonic Engine enclosure, a single molded component that carries both a Polk proprietary 3.25" Extended Linear Motion (ELM) mid-range driver and a 1.0" Advance Isotropic ring radiator (AIR) tweeter.

According to Polk, combining these transducers in a single array produces an uncommonly wide and uniform dispersion pattern. The top-of-the-line LSiM 707 complements this array with a 6.5" ELM mid-woofer driver and dual 6"x9" ELM subwoofers featuring Polk's PowerPort, which attempts to maximize low-bass energy ordinarily lost as air turbulence and heat exiting the enclosure. The smaller LSiM 705 features the identical Dynamic Sonic Engine for high frequencies and midrange, along with Polk-designed ELM 5.25" mid-woofer and dual 5"x7" ELM subwoofers. A bookshelf-sized version of the towers, the LSiM 703, utilizes the same technologies as the towers, minus the internal subwoofer drivers.

Two center channel models are offered in the flagship LSiM series. The larger LSiM 706c features the same AIR ring tweeter and ELM 3.5" mid-bass driver that characterizes the Dynamic Sonic Engine of the larger tower models, flanked by two ELM 6.5" mid-bass drivers with a rear port design. A smaller center channel model, the LSiM 704c features the same layout, only with ELM 5.25" mid-bass drivers. The LSiM 702f/x surround model completes the series for a multichannel setup, offering the Dynamic Sonic Engine ELM 3.25' mid-range, 1 x 1.0" AIR ring radiator tweeter and a ELM 6.5" mid-woofer driver. The 702f/x also includes a proximity switch to compensate for placement near corners in the listening area.

Polk is currently shipping the LSiM series.

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