Features: * Adopting high-efficiency Class-D amplifying circuit with built-in high-efficiency switching power supply, which makes the whole machine efficiency up to 85%. * Reasonable heat dissipation layout is adopted inside the product, which enables the product to maintain a working temperature lower than 55 degrees even in extremely harsh working environment, greatly extending the service life of the equipment. * 1U standard 19-inch industrial chassis design. * Providing 2 channel of 100 v or 4-16 Ω output terminal wiring speaker. * Without transformer output 100V and can switch constant resistance 4-16Ω output. * The fault output function can remotely monitor the working state of amplifier. * The product has short circuit, overload and overheat protection. * Support 2-channel independent power supply function. * 85% high-efficiency amplifier with low power loss and heat output. * 2-channel European terminal balanced input and 2-channel European terminal output.