SpeakerCraft CSS6 Three Square In Ceiling Speakers also offer technology that makes them unique in the way they disperse music or movie soundtracks in the room. First of all, the tweeter pivots to allow you to aim the critical high frequencies at the listening area. SpeakerCraft also created the WavePlane® which, supports the tweeter and keeps those same high frequencies from bouncing off the woofer. This means better sound and more uniform coverage throughout the room.