Mixing consoles are used in many applications, including recording studios, public address systems, sound reinforcement system, broadcasting, television, and film, post production. A typical, simple application combines signals from two microphones (each used by vocalists singing a duet, perhaps) into an amplifier that drives one set of speakers simultaneously. In live performances, the signal from the mixer usually goes directly to an amplifier (unless the mixer has a built in power amplifier or is connected to powered speakers). A DJ Mixer may have only two channels, for mixing two record players. A coffeehouse’s tiny stage might only have a six channel mixer, enough for a duo of singer-guitarists. A nightclub stage’s mixer for rock music shows may have 24 channels for mixing the signals from a rhythm section and several vocalists. A mixing console for a large concert may have 48 channels. A mixing console in a professional recording studio may have as many as 72 channels.