Wireless Speakers

The most current type of driver uses a lightweight diaphragm connected to a rigid basket, or frame, via flexible suspension that constrains a coil of fine wire to stir axially through a cylindrical magnetic gap.

To accurately reproduce bare level bass notes without unwanted resonances (i.e., from cabinet panels), subwoofer systems must be solidly constructed and properly braced; good ones are about heavy. Many Wireless Speakers subwoofer systems include skill amplifiers and electronic filters, with additional controls relevant to low frequency reproduction. These variants are plain as "active subwoofers". Passive subwoofers ask external amplification.