Subwoofer

Subwoofer (also known as “subs”) is a woofer that produces of bass audio which has frequencies, from 20 Hz up to 150 Hz, and are used to boost the low frequency performance of main loudspeakers.

Subwoofers are constructed by mounting one or more woofers in a well-braced wood or plastic attachment. Subwoofers have been designed using a number of speaker attachment designs, including bass reflex, infinite baffle, horn-loaded, and band pass designs, each of which has advantages and disadvantages in efficiency, size, distortion, cost, and power handling. Passive subwoofers have a subwoofer driver and attachment and they are powered by an external amplifier. Active subwoofers include a built-in amplifier.

Loudspeaker

A loudspeaker is an electro acoustical transducer that converts an electrical signal to sound the term loudspeaker can refer to individual transducers (known as drivers), or to complete systems consisting of an attachment incorporating one or more drivers and electrical filter component. Loudspeakers (and other electro acoustic transducers) are the most variable elements in a modern audio system and are usually responsible for most audible differences when comparing systems.

To adequately reproduce a wide range of frequencies, most loudspeaker systems require more than one driver, particularly for high sound pressure level or high accuracy. Individual drivers are used to reproduce different frequency ranges. The drivers are named subwoofers (very low frequencies), woofers (low frequencies), mid range speakers (middle frequencies), tweeters (high frequencies) and sometimes super tweeters optimized for the highest audible frequencies.

When multiple drivers are used in a system, a “filter network”, called a crossover