polk audio bookshelf speakers at Crutchfield.com

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Polk Audio (17)

Price Range

$50 - $750

Enclosure
The cabinet that holds the speaker drivers. There are several types, each with its own sound characteristics:.
An acoustic suspension enclosure is a sealed box that provides accurate, tight bass response, though it may sacrifice some efficiency and /or overall volume to achieve this.
A bass reflex enclosure includes a "tuned" port that releases some of the energy produced by the woofer's backward movement. This design increases bass response, though it may sacrifice some accuracy in exchange for the added output.
A passive radiator is a type of woofer cone found on some enclosures which isn't driven by the speaker's magnetic motor, but rather moves in response to the main woofer, increasing bass output.
An in-wall or in-ceiling speaker uses the space behind your wall or ceiling as a large cabinet, so it has the ability to produce slightly more bass than some standalone speakers of the same size.

Bass Reflex (17)

General Features

Bi-amp Inputs (6)

Bi-amping means that instead of driving a speaker full-range with a single channel of amplification through a single set of speaker cables, you actually connect two sets of cables, with each set carrying the signal from a separate amplifier (or amp channel). This way, low frequencies and high frequencies each receive dedicated amplification. Bi-wiring involves connecting two sets of cables to your speakers, like bi-amping, but both sets of cables connect to the same set of output connectors on your receiver or amplifier. Bi-wiring doesn't deliver more wattage to your speakers, so it doesn't offer as dramatic a sonic improvement as bi-amping. Still, many audiophiles find that it offers subtle improvements in imaging and detail.

Video Shielded (5)

A way of containing a speaker's magnetic energy inside its enclosure. This is usually achieved by placing another speaker magnet back-to-back with the existing one so that the two magnetic fields cancel each other. Shielding may also be achieved by lining the inside of the speaker cabinet with metal. Video shielding is important for home theater speakers - especially the center channel speaker - because if an unshielded speaker is placed too close to your TV, the magnetic energy can cause picture distortion and even permanently damage the TV's picture tube.