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Basic amplifiers are a cost-effective alternative to conventional Praesideo power amplifiers for situations where there is no need for built-in digital signal processing functions (such as equalizer, delay, and AVC). None of them have a Praesideo interface. They connect to the Praesideo network by providing it with audio signals and having full control over the prs-16mci multichannel interface. There are four versions: PRS?1B500 (1 x 500w), PRS - 2B250 (2 x 250w), PRS - 4B125 (4 x 125w) and PRS - 8B060 (8 x 60w). The basic amplifier is fully monitored and fault events are reported to the Praesideo network controller via a multichannel interface. The basic amplifier can provide the connection for the independent group A and group B loudspeakers in each region, and support the loop wiring of class A loudspeaker. These devices shall be installed in the 19-inch cabinet using the attached mounting bracket. Annotated model suffix (-eu, -cn... ) represents the local version of these amplifiers. The amplifiers are identical except for certification, power lines and origin. Basic function amplification PRS?1B500 is a single channel 500w device; PRS?2B250 is a two-channel amplifier with 250 W per channel; PRS?4B125 is a four-channel amplifier, each channel being 125w; PRS?8B060 is an eight-channel amplifier with 60 W per channel. These devices are powered by a low-start switching power supply and can run on a 48-volt standby battery power supply. These amplifiers are connected to a built-in output transformer used to drive 70-v and 100-v speakers. They have independent overload protection group A and group B speaker connections that support class A loop wiring. Users can configure each passageway independently of the group A and group B speakers to achieve redundancy. These devices connect to the prs-16mci multichannel interface for audio, control, and monitoring, but can also operate independently. Audio these amplifiers have analog audio line inputs for low priority local audio. Network audio from a multichannel interface has a higher priority than local audio. Safe these devices can use ac power and 48 V emergency standby battery power, and can switch between the two automatically. They monitor both power sources and themselves. When used in conjunction with the prs-16mci multichannel interface, they can also monitor the speaker and its circuit. Complete channel separation enables one channel of the amplifier to be used as a backup amplifier for another amplifier channel.