The KEF B139 home entertainment speaker system includes a100 watts speaker that delivers an astounding sound to give you a movie-theater experience right inside your living room. A plastic diaphragm in this KEF speaker effectively damps the resonance for a cleaner and stiffer base output. Furthermore, this KEF speaker has a frequency response of 20 to 1000 Hz that helps in producing superior quality sound with minimum distortion, thereby generating an amazing bass effect. The KEF B139 home entertainment speaker system’s 100 watts speaker has a 96 dB sensitivity that aids in producing louder, clear sound without any interference. Moreover, this KEF speaker is suitable for use in a totally enclosed box, reflex, transmission line, horn, and other low frequency applications.