CA-900II power amplifier is a classic analog power amplifier. It adopts class H circuit design, which is mature and stable, suitable for various harsh environments, and can realize trouble-free operation. There are a variety of configurations, power levels and functions to choose from, which can almost meet the needs of all commercial applications. Including a large number of comprehensive protection circuits of CA power amplifiers. In view of the high temperature environment that is unfavorable to the machine when the power amplifier is working, the built-in audio limiter, start-up delayer and peak current limiter of the CA series power amplifier provide comprehensive protection.