The XJ-300ST amplifier from Earthquake Sound packs more power and maintains more flexibility than any other amplifier; no amplification task is beyond its capability. With its unimposing miniature size and an unbelievable amount of cool running power, this powerful and compact class J amplifier is an installer's go-to dream. Keeping flexibility and convenience in mind, Earthquake has kept its patented interlocking design so that two amplifiers can be connected, resulting in a 4-channel amplifier configuration using only 1U of rack space. The XJ-300ST can also be mounted on the wall or inside a cabinet by affixing the short mounting ears to the preassigned holes on the sides of the amplifier. With endless configuration scenarios, the XJ-300ST amplifier can be used as a mono (bridged) amplifier, 2.1-channel amplifier, 2-channel amplifier 4/8/12, and 16-channel amplification with industry-leading power density and efficiency. With the XJ-300ST, connecting a third speaker between the main channels is possible. This matrix mono channel (aka "tri-mode" configuration) plays the combined content of both channels. It is beneficial for powering 2 satellite speakers and a subwoofer. Approaching 99% efficiency, the XJ-300ST amplifier runs cool and composed and can be placed in a tight rack with components on all sides. The massive power capability is made possible due to the advanced nature of the patented Class J output stage. The switching frequency of the output and the amplitude of the power supply is modulated in real-time based on the frequency and amplitude content of the input. No other amplifier can match the efficiency and power of Earthquake's Class J technology.