Cyrus 5

Based on the same circuitry as the Cyrus 7 amp, Cyrus 5 offered nearly all the advantages of its bigger brother, the Cyrus 7. In true Cyrus style if you bought the 5 and later you decided that you would really like more power you could have had your 5 upgraded to full Cyrus 7 specification. Remote control, MC BUS™ compatible, preamp-out, intelligent headphone output and computer control system are all included.

This amplifier builds on the traditional Cyrus benefits of superb sound quality, technical excellence and system flexibility as the core of a quality audio system. With a selection of partnering Cyrus source components and system extensions for multi-room or audio-visual applications, the Cyrus 5 was a welcome addition to the verstile Cyrus range.

With access to the latest Computer Aided Design tools and electronic modelling techniques the Cyrus team crossed new boundaries in establishing new circuit topologies for inclusion in the Cyrus 5. Traditional Cyrus technical standards such as short-path signal routing techniques and the use of micro-miniature SMD components are upheld and further refined for this design. At the completion of the design phase is an extensive program of listening trials to fine tune the sound of the amplifier. For these rigorous tests all styles of music are used with a wide selection of high quality ancillary components.

A high-efficency power amplifier circuit designed for the Cyrus 5 family of products. The power amplifier employs single substrate input transistors for consistant operating conditions and a new fast-bias output stage to deliver consistantly low crossover distortion and minimise transient thermal distortions. A speaker compensation network optimises the interface between the amplifier and loudspeaker. Twin bi-wirable terminals are included for convenient bi-wiring connection.

A dedicated high current headphone amplifier drives a full size ¼” jack socket located on the rear panel of the unit. A separate front panel control to select headphone listening and mute the loudspeakers allows headphones to be permanently connected to the Cyrus 5. The intelligent control system monitors the connection of headphones to the socket at all times and will restore sound through the loudspeakers if the headphones are disconnected.

A sophisticated 105VA toroidal power transformer forms the essential part of the Cyrus 5 advanced linear Power supply system. The “zero-mechanical-noise” core design of this transformer ensures high performance within an unusually wide AC mains voltage.

The Cyrus 5 includes a smart electronic management system which enables the use of a full function remote control handset and provides many other useful benefits such as the MC-BUS™ system and a fast acting overload protector. A fully electronic silent standby mode reduces standby consumption power to a minimum when not in use.

The unique MC-BUS connectivity of the Cyrus 5 is in keeping with the total system approach of the Cyrus range of products. This facility enhances ergonomic operation of the unit in a system context. Total automation of the factory test phase of Cyrus 5 is facilitated via the MC-Bus during its manufacturing process, eliminating potential human error.

The quality lightweight die-cast enclosure of the Cyrus 5 has a myriad of advantages both electrically and mechanically. The non-resonant nature of the alloy minimises microphonic effects, while its nonferrous composition provides an effective shield from external electro-magnetic disturbances. This also eliminates coupling of the power transformer stray magnetic fields to the sensitive audio circuitry.

Technical Information

Electrical

Line inputs – 5 Line + 2 Tape
Outputs – Bi-wire Loudspeakers, Tape-out, Preamp-out, Headphone
Power Supply – 107VA Toroidal transformer with 5 regulated rails
Communications – MC-BUS System BUS
Remote Control – Supplied with Cyrus Amp/CD/tuner system remote control

Specifications

Continuous Power – 40W/CH (both driven into 8 Ohms) 50W/CH (both driven into 4 Ohms)
Burst Power – 173W (IHF, one channel driven into 1 Ohm)
Distortion – 0.003%, 1kHz (into 8 Ohms) 0.005%, 1kHz (into 4 Ohms)
Frequency Response – -3 dB, 4Hz and 90kHz Damping Factor 80
Sensitivity – (40W) Line: 179mV
Input impedance – 50kOhm (RCA).
Output voltage – 200mV (Tape out), 380mV (Pre out)
S/N Ratio – 100dBA (ref. 40W)
Channel Balance – ±0.2dB (0dB to -63dB)
Volume control accuracy – ±0.1dB (0dB to -63dB)
Dimensions – (H x W x D) 73 x 215 x 360 (mm)
Weight – 3.7kg
Finish – Black

Designed & Engineered in the United Kingdom