The 800 Series Line Amplifiers are designed for use in professional audio appplications. Each model has either one or two channels, designed to operate as a discrete line amplifier. Dual channel cards will have two identical channels constructed on one printed circuit board. Typical applications are public address systems, broadcast studios, sales presentation rooms headphone listening systems, multi-room audio systems, and recording systems. The actual application of the amplifiers is found in buildings such as airports, factories, courthouses, casinos, convention centers, libraries, hotels, racetracks, training systems, corporate boardrooms, etc. The 800 Series Line Amplifiers offer 4 different models, 2 single channel versions, and 2 dual channel versions.