The EPC9118 is a digital audio amplifier manufactured by TDK. It is a Class-D amplifier, meaning that it uses pulse-width modulation to efficiently transfer a signal from one device to another. This type of amplifier is commonly used in automotive, professional audio, and home audio applications. The EPC9118 has an output power of up to 2x50W at 4ohm and can accept a wide range of input signals. It also has integrated protection circuits, a low power standby mode, adjustable gain settings, and adjustable current limit. It is compact, lightweight, and easy to install, making it a great choice for any audio system.