Cyrus has a prestigious history of high-fidelity amplifier design. For more than 30 years we have crafted some of the world's finest audio components. The finest of them all is the Mono X 300. Engineered from scratch using our in-house developed Zero Feedback technology, the Mono X carries both prodigious power and exceptional control. Capable of driving the world's most demanding speakers, the Mono X is the crown prince of power amplifiers.