Installation technology is used when audio technology is to be permanently installed. Unobtrusive wall or ceiling speakers are suitable, for example, for sound reinforcement in restaurants, bars, hotels, department stores or small shops. Suitable installation amplifiers with 100 volt or 70 volt technology can drive a large number of loudspeakers with long cable runs. Zone mixers and audio scribblers distribute audio signals to different parts of the building, and feed devices allow audio material to be played from various media such as CDs, USB sticks, SD cards, from the radio or via Bluetooth. Well-known manufacturers in this sector are: Apart, Denon, Audac, Adam Hall, Bose, IMG Stageline, FBT, JBL, LD-Systems, Monacor and others.