The Federal Signal line of high-powered audio amplifiers provides the flexibility, quality, and performance required in a public address system. AudioMaster® amplifiers are available in four different power ratings from 150 to 1000 watts per channel, and can be independently configured to drive either the step-down transformers in a distributed “constant-voltage” loudspeaker system (70-volt or 100-volt mode) or a system of loudspeakers that do not require step-down transformers (8/4 Ohm mode).