LSiM 702fx

“The LSi line has been Polk’s flagship selection for almost a decade, but in light of current technological possibilities, we felt it was time for a re-visit. The result is not so much an evolution of the current series as it is a re-engineering of the qualities.”

The LSiM Series achieves all of Polk’s high standards and performance objectives. The Series produces open, transparent, three-dimensional sound with acute tonal and temporal response at all frequencies; extended dynamics; uniformly wide dispersion; deep, tight integrated bass; and compatibility with a broad range of past, present and future electronics.

The LSiM Series consists of a full range of tower, bookshelf, centre and surround channel models. At the top of the line up sits the two, 4-way floor-standing tower models, the LSiM 707 and LSiM 705. The LSiM 707 and LSiM 705 each feature state-of-the-art transducers built with Polk’s Dynamic Balance design technology, which combines the latest in composite materials and computer assisted-geometry to create drivers that produce flat frequency responses, with sharp detail, transparency and the ability to play loud without strain. Both tower speakers feature these high performance drivers as well as Polk’s Dynamic Sonic Engine enclosure, which houses the Extended Linear Motion (ELM) mid-range driver and the Advance Isotropic ring radiator (AIR) tweeter.

Combining these transducers in a single optimised array produces a 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 6×9″ ELM subwoofers featuring Polk’s PowerPort, which maximises low-bass energy ordinarily lost as air turbulence in 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 5×7″ ELM subwoofers. A bookshelf-sized version of the towers, the LSiM 703, utilises the same technologies as the towers, minus the internal subwoofer drivers.

Two centre 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 characterises 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 centre 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 an ELM 3.25” mid-range, 2 x 1.0” AIR ring radiator tweeters and an ELM 6.5” mid-woofer driver. All the speakers have been timbre matched for a perfectly blended and balanced acoustic environment.

The Polk LSiM series features Polk’s most advanced material engineering, with Super Cell Aerated polypropylene cones that reduce mass and its resulting distortions. Driver baskets are built from cast aluminum frames that provide superior rigidity and exceptionally flat frequency response. Butyl rubber surrounds ensure linearity. Finishing touches include magnetic, non-diffracting grills, easy-leveling floor spikes and rubber trims around the driver baskets that create a cosmetically clean fit and finish.