Cyrus Mono X 300 Signature Monoblock Power Amplifier – Brushed Black

Cyrus is one of Britain’s best known Hi-Fi manufacturers, and here we have, in the company’s traditional “shoebox” casing, a superb pair of its highly regarded X 300 Signature Monoblock power amplifiers. In the “Brushed Black” finish they are in very good condition, noting a slight blemish on the front of one of them – please see photographs. They come in original factory packaging with mains cables, MC-BUS cables, speaker plugs, manual and as ever our three month warranty.
Cyrus Say….
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.
Cyrus’s latest generation Zero Feedback Power amplifier brings inherently natural and high resolution musical reproduction. By removing the traditional amplifier ‘global feedback’ loop, sonic improvements are made and our signature sound quality is produced.
The high current design of the Mono X 300 Signature effortlessly drives even the toughest loudspeaker loads. A 200 VA toroidal transformer can provide a huge 319 Watts into 6 ohms which not only produce powerful sound but remains stable throughout.
Balanced or unbalanced connectivity offer all the connectivity requirements to match up with Cyrus pre amplifiers. High quality bi-wire terminals are provided to allow ideal connectivity to high performance loudspeakers.
12v trigger and RS232 control are provided as standard along with an intelligent signal sense power mode which allows the Mono X 300 Signature to be installed in a variety of setups.
Having so much power inside our die-cast aluminium chassis is not a problem thanks to a twin fan design which has a proprietary signal sensing circuit that run the fans in line with the music level; meaning they will never intrude even on the quietest passages of music.
All Cyrus components are manufactured in an advanced die-cast aluminium chassis and this hand finished casework is an integral part of the products’ sound. It’s not just about good looks; the chassis composition is specifically designed to create an electronically shielded and mechanically vibration-free environment for the sensitive audio circuits which are hung inside the inverted chassis, avoiding unwanted electric currents and secondary magnetic fields so the sound you hear is the very best that it can be.
Features & Specifications:
Monobloc power amplifier
Zero feedback technology
XLR + RCA inputs
12 V trigger
Input Sensitivity (50 W 8 Ω) RCA: 381 mV; BAL: 775 mV
Input Sensitivity (225 W 8 Ω) RCA: 890 mV; BAL: 1.78 V
Input Impedance (RCA): 47 kΩ; (BAL): 20 kΩ
Output Power (Continuous): 319 W into 6 Ω
THD+N @2/3 full power: (20 Hz – 20 kHz 8 Ω) < 0.05 %; (1 kHz 8 Ω) < 0.004 %
Slew Rate (input filter bypassed): 700 v/μS
Frequency Response (- 3 dB): 0.1 Hz-300 kHz
S/N Ratio (Ref. 225 W / 8 Ω): 116 dBA
Chain Output (buffered): (unity gain) 890 mV
Power Consumption: Maximum – 750 W; ON (No Signal) – 23 W; Standby – < 1 W
Dimensions: 215 (W) x 360 (D) x 73 (H) mm
Weight: 6.4 kg

For a review from What Hi-Fi? magazine please click here