CS series Dipole/Bipole FastLoc™ speakers are a full range ceiling loudspeaker that incorporates high tech woofer materials with a butyl rubber surround and two fixed angle state-of-theart Ferrofluid cooled dome tweeters. The FastLoc™ grill is a patent pending feature found only at Current Audio. Our design has allowed for the smallest exposed plastic bezel in the industry, truly making it disappear into the mounting surface. The FastLoc™ grill's unique patent pending mechanism allows for a quick installation and removal of the grill while securely fastening it in place to all types of mounting surfaces. Due to the unique design the grill will conform to uneven surfaces including popcorn, heavy textured and uneven ceilings. While our competitors have chosen to utilize magnets in their designs thus requiring the use of a steel grill that will rust our design allows us to use corrosion and rust resistant aluminum. This revolutionary combination provides superior and more natural wider big sound close to what you would experience in a movie theater that has multiple surround speakers. The dual purpose speaker is the perfect choice for both Side Surround and Surround Back applications in one package. A simple switch on the Tweeter Bridge allows you to choose either Dipole for Side Surround or Bipole for the Surround Back function. In the Dipole function the tweeters are purposely out of phase to create a Null around the listening area that detunes the localization for ambience. When set to Bipole the tweeters are in phase to enhance localization for Dolby Digital EX, DTS-ES and THX EX. The Infinite Baffle design makes it the ideal choice for typical applications in open beam attic or enclosed ceilings.