In audio, the line mixers (mixing console) is an electronic product for pairing, routing and adjusting the volume level, tone colour or dynamics of many distinct audio signals, such as microphones being used by performers, microphones picking up acoustic audio equipments such as drums, signals from electric or electronic instruments such as the synthesizer electric or bass, or music playing on a CD player.

Matrix Integrations provide line mixers for various studios, clubs and many other applications in India.

In the 2010s, the line mixers are able to control digital or analog signals, based on the type of mixer. The improved signals are summed to produce the combined final signals, which can then be then transmitted, amplified through a sound reinforcement system or some combination of these applications.

Line mixers are used in many applications, including public address systems, recording studios, audio reinforcement systems, dance bars, clubs, transmitting, television, and film production. An average, simple application brings together signals from two microphones (each used by vocalists performing a duet, perhaps) into an amplifier that drives one set of speakers at same time. In live performances, the signal from the line mixers usually goes straight to an amplifier which is linked with speaker cabinets, unless the mixer has a built-in power amplifier or is connected to powered speakers.

The DJ mixers may have only two channels, for combining two record players. Acoffeehouse's tiny stage might only have a six channel mixer, sufficient for a drummer and two singer-guitarists. A night club stage's mixer for rock music shows may have 24 channels for combining the signals from lead guitar, beat area and several vocalists. The line mixers for a large concert may have 48 channels and in a professional recording studio may have as many as 72 channels.