A subwoofer is a woofer driver used only for the lowest detail of the audio spectrum: broadly below 100-120 Hz. Because the intended expanse of frequencies in these is limited, subwoofer entity design is mainly simpler in many respects than for conventional loudspeakers, often consisting of a single subwoofer driver enclosed in a suitable cabinet or enclosure.

To accurately reproduce model lowering bass notes without unwanted resonances (i.e., from cabinet panels), subwoofer systems must be solidly constructed and properly braced; good ones are typically heavy. Alive With subwoofer systems include effectiveness amplifiers and electronic filters, with additional controls relevant to low frequency reproduction. These variants are celebrated as "active subwoofers". Passive subwoofers require external Wireless Speakers amplification.