Cyrus Classic PRE
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Cyrus Classic PRE Stereo Preamplifier: A Major Evolution in the Classic Line
The Cyrus Classic PRE represents the latest evolution of an iconic preamplifier from the British brand. With over a decade of experience, this new version benefits from the technological advancements developed for the XR series while retaining the characteristic design of the Classic range. Cyrus’s R&D team has completely redesigned the circuit layout and upgraded most of the internal components, resulting in significant sound improvements that are sure to appeal to the most discerning audiophiles.
A Sophisticated Power Supply for Optimal Performance
The power supply of the Classic PRE has been given special attention. It is based on a 74 VA toroidal transformer, complemented by 11 independent regulators. This design ensures a stable, low-noise power supply, crucial for preserving the integrity of the audio signal. The digital control circuits benefit from a separate power supply, completely isolated from the signal circuits, thus eliminating any risk of interference.
A High-Quality MM Phono Stage
The phono preamplification stage for MM (Moving Magnet) cartridges in the Classic PRE is directly inspired by the Phono Signature, Cyrus’s high-end phono preamplifier. It includes two active gain stages and passive RIAA equalization. This advanced design guarantees an exceptionally low noise floor and a wide dynamic range, providing a clear and transparent reproduction of vinyl records.
Outputs Suitable for All Configurations
The Classic PRE offers unbalanced RCA and balanced XLR outputs. The unbalanced outputs are ideal for systems where the power amplifier is close to the preamplifier. The balanced outputs, on the other hand, are recommended for longer cables or when the Classic PRE drives power amplifiers placed near the speakers. The balanced connection offers better immunity to interference and maintains signal integrity over long distances.
Compatibility with the PSX-R External Power Supply
The Classic PRE is equipped with a port for connecting Cyrus’s PSX-R external power supply. This additional power supply is routed to the preamplifier’s analog stages, providing an even more stable, low-noise power source for critical circuits. This upgrade option further enhances the preamplifier’s sound performance.
A Design Focused on Sound Quality
The design philosophy of the Classic PRE prioritizes audio signal purity. The preamplifier uses relay input selection for the five analog inputs, ensuring precise switching without signal degradation. The volume control benefits from a high-precision gain adjustment, ensuring perfect channel balance. The wide bandwidth design preserves signal integrity across the entire audible range and beyond.
High-Quality British Manufacturing
Like all Cyrus products, the Classic PRE is designed, manufactured, and assembled in England. This approach allows the brand to maintain very high-quality standards and exercise rigorous control over every stage of production. The result is a preamplifier that combines reliability, performance, and impeccable finish.
Technical Specifications
Audio Performance - Line
- Impedance
- Input: 28 kΩ
- Output: 47 Ω
- Balanced output (per phase): 47 Ω
- Voltage
- Maximum input: 2.5 V
- Maximum output: 2.5 V
- Maximum balanced output: 5 V
- System gain
- Line: 6 dB
- Balanced: 12 dB
- Frequency response (-3 dB): < 0.5 Hz, > 100 kHz
- Signal-to-noise ratio (unweighted, ref. 2 V output): 110 dB
- Total harmonic distortion (THD): < 0.001%
Audio Performance - Phono
- Input impedance: 47 kΩ
- Maximum input voltage (1 kHz): 25 mV
- Phono stage gain (1 kHz): 40 dB
- RIAA tolerance: < 0.5 dB
- Signal-to-noise ratio (unweighted, ref. 2 V output): 83 dB
- THD: < 0.07%
Audio Performance - Digital
- Input voltage: 500 mV peak-to-peak
- Input impedance: 75 Ω
- Sampling frequency range (S/PDIF): 32 kHz - 192 kHz
- Audio formats (S/PDIF): Stereo PCM
- Signal-to-noise ratio (unweighted, pre-output, 0 dB full scale): > 97 dB
- THD (pre-output, 0 dB full scale): < 0.003%
Audio Performance - Headphones
- Recommended impedance: 16 Ω - 330 Ω
- Output power (16 Ω load): 138 mW
- Maximum output voltage (330 Ω load): 1.85 V
- Signal-to-noise ratio (unweighted, 35 mW / 16 Ω): 90 dB
- THD (35 mW / 16 Ω): < 0.01%
Connectivity
Inputs
- 4 analog line-level
- 1 moving magnet (MM) phono for turntable
- 2 digital coaxial via RCA
- 2 digital optical via Toslink
Outputs
- Balanced via XLR connectors
- Unbalanced
- Fixed/recording
- Headphones via 3.5 mm mini-jack
Special Connections
- MC-BUS (control integration with Cyrus system)
- PSX-R upgrade
- Firmware update port
Physical Characteristics
Power Supply
- Voltage: As indicated on the rear panel of the device
- Consumption
- Standby: < 0.5 W
- Maximum: 25 W
Dimensions and Construction
- Dimensions (W × H × D): 215 × 75 × 365 mm
- Weight: 4.4 kg
- Material: Die-cast chassis
Frequently Asked Questions
Is the Classic PRE compatible with turntables with MC (Moving Coil) cartridges?
No, the built-in phono input of the Classic PRE is designed exclusively for MM (Moving Magnet) cartridges. To use an MC cartridge, you will need an external MC-compatible phono preamplifier.
Can I use the Classic PRE with active speakers?
Yes, the Classic PRE is perfectly suited to drive active speakers. Its balanced XLR outputs are particularly recommended in this case, especially if the cables are long.
Is adding the external PSX-R power supply really beneficial?
Using the PSX-R can significantly enhance performance, particularly in terms of dynamics and definition. However, the extent of the improvement will depend on your system and your auditory sensitivity.
Can I use the Classic PRE as a simple digital-to-analog converter?
Yes, you can use the digital inputs of the Classic PRE and its unregulated RCA line output to use it as a standalone DAC in your hi-fi system.
- Eco-contribution included in the sale price.
- GTIN / EAN: 5060020434556
