Many listeners have found that built-in speakers are the perfect solution for side and/or rear channel surround speakers. They take up no floor space and virtually disappear from view. Definitive specifically designed the di 5.5bps for surround channel duties. You can install them in walls or ceilings For enveloping surround effects with smooth natural response and precise detail retrieval. Every sound effect and musical note will be revealed with exact accuracy while you are enveloped in a life-like bubble of sound.