TOA Electronics' DA-250D is a high-performance 1RU digital amplifier for installation applications. It has two input and output channels, with replaceable terminal blocks for the inputs and a screw terminal strip for the outputs. The first input channel signal can be routed to both outputs if desired, making it ideal for multi-zone paging. Large control knobs for input level control, as well as LEDs for input, output, power, peak, and protect status, are located on the front of the unit. Short circuits, overloads, and overheating are all protected by the built-in protection circuitry. The DA-250D's Class-D circuitry provides great audio quality and allows it to run at an efficiency of 85 percent, consuming about 1/3 less power than analogue amplifiers.