Cyrus Classic AMP

The latest update to an integrated amplifier that has been part of the Cyrus product range for over a decade.

This integrated amplifier provides a significant step up in performance from previous versions by using everything that we learnt when developing the fantastic XR Series, but retaining the familiar design of the Classic series. The circuit design has been completely re-designed and the majority of the internal components have been upgraded by the Cyrus R&D team, which has resulted in sound improvements that will help the Classic series retain a loyal fan base for years to come.

Power Amplifier

The power amplifier delivers 91W per channel into 6Ω. The wideband design responds from D.C. to beyond 50kHz to ensure a flat frequency response and minimal phase shift through the audio band.

Analogue Preamplifier

The analogue preamp features relay input selection for the five analogue inputs and a precision gain control for volume. The design is intentionally wide bandwidth.

Power Supply

The power supply includes a 304VA toroidal power transformer delivering power to a high capacity power supply reserve. The preamplifier power supply is electrically separated from the power amplifier and driven from its own transformer winding. Digital control circuits are assigned a separate mains power supply, completely isolated from the signal circuitry.

PSX-R

The Classic AMP includes a port for the PSX-R power supply. Power from the PSX-R is routed internally to the analogue stages of the preamplifier to provide a more stable, low-noise power supply for the analogue preamp and post-DAC stages of the D/A converter.

Power Supply

Voltage: As plate on rear of unit

Power Consumption

Standby <0.5W
Maximum 500W

Enclosure

Dimensions (WxHxD) 215 x 75 x 365mm

Weight

6.7kg

Material

Die cast chassis

Line audio performance

Power Output (2 ch driven) 4 Ohms 112W
Power Output (2 ch driven) 6 Ohms 91W
Power Output (2 ch driven) 8 Ohms 70W
THD+N (1kHz, 2/3 power) 6 Ohms <0.002%
Input Sensitivity (91W/6Ω) 225mV
Input Impedance 28kΩ
Max input signal 2.5V
Frequency Response (-3dB) <05Hz, >50kHz
S/N Ratio (unwtd) >100dB

Phono audio performance

Input Sensitivity (91W/6Ω) 2.3mV
Input Impedance 47kΩ
Max input voltage (1kHz) 25mV
Phono stage gain (1kHz) 80dB
RIAA tolerance <0.5dB
S/N Ratio (unwtd, ref 91W/6Ω, vol -6dB) 83dB
THD <0.07%

Digital audio performance

Input voltage 500mV pk-pk
Input Impedance 75Ω
Sample rate range 32k - 192k
Audio formats PCM stereo only
S/N ratio (0dB fs) -94dB
THD+N (0dB fs) <0.006%

Headphone performance

Recommended headphone impedance 16Ω - 330Ω
Output power (16Ω load) 138mW
Max output voltage (330Ω load) 1.85V
Signal to Noise Ratio (unwtd) (35mW//16Ω)90dB
THD (35mW//16Ω) <0.01%

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