There's a total of six new models, including floorstanding, center channel, bookshelf, and surround.
Polk is one of those companies that does sound really well while keeping costs from getting to the point of ridiculousness. The new flagship LSiM line is a great example of that. It's high-end, but it's still pretty affordable.
The big boys of the LSiM line are the $1,999 707 and the $1,499 705 floorstanding speakers. They're 4-way tower models that incorporate transducers packing Polk's Dynamic Balance design technology. Both feature 3.25 inch drivers and one inch tweeters, but the 707 adds a 6.5 inch mid-woofer driver to the mix.
Polk's new center channels offer some of the same tech as the floorstanding speakers. The LSiM 706c, which comes in at $1,099, uses the same AIR ring tweeter, and same 3.5 inch driver. It also packs a pair of 6.5 inch mid-bass drivers, unlike the LSiM 704c which only packs 5.25 inches.
You'll have a bit of a wait if you want to pick up Polk's new speakers though, as they won't be available until the beginning of 2011.