The Unison Research Preludio captures the essence of pure sound reproduction through its Class-A design. Its exquisite craftsmanship and engineering principles produce an auditory experience that remains true to the source material.
The Unison Research Preludio integrates a single-ended ultralinear Class-A output stage, allowing for low distortion and a smooth response across a wide frequency range. Utilizing two 6550/KT88 output valves, along with two ECC82 driver tubes, this configuration ensures a warm yet precise audio output, characterized by low output impedance of 6 ohms that aids in effective power transfer to a variety of speaker loads. The amplifier operates at a maximum power output of 14W per channel, which, despite being lower than solid-state competitors, provides a distinctive dynamic range and harmonic richness that many audiophiles appreciate. Additionally, the input impedance of 47 kOhm facilitates compatibility with a wide array of sources, while the carefully designed feedback factor of 10dB maintains linearity and reduces potential artifacts. The frequency response spans from 15 Hz to 50 kHz, ensuring both deep lows and extended highs are faithfully reproduced, contributing to its overall sonic fidelity.
Key Features
- Single-ended ultralinear A class: Offers a natural, warm sound profile with low distortion characteristics, ideal for critical listening.
- Output power of 14W/channel: Delivers a sufficient power level to drive high-efficiency speakers while maintaining clarity and dynamic range.
- Input impedance of 47 kOhm: Ensures versatile compatibility with various line-level sources, enabling better system integration.
- Output impedance of 6 ohm: Optimizes power transfer to speakers, enhancing overall system performance and sound quality.
- Feedback factor of 10dB: Reduces signal distortion and improves linearity, preserving audio integrity during playback.
- Frequency response of 15 - 50000 Hz: Covers a broad spectrum of audible sound, ensuring accurate reproduction from deep bass to high treble.
- Robust valve configuration: Employs two 6550/KT88 and two ECC82 tubes, known for their reliability and sonic performance.
- Remote control functionality: Allows for convenient volume adjustments without compromising audio performance.
Technical Specifications
- Type: Stereo Integrated Valve Amplifier
- Output Stage: Single ended ultralinear A class
- Output Power: 14W / channel
- Inputs: 4 line, 1 tape
- Outputs: 1 tape, 1 sub woofer, loudspeakers
- Input Impedance: 47 kOhm
- Output Impedance: 6 ohm
- Feedback factor: 10dB
- Frequency Response: 15 – 50000 Hz
- Valves: 2 x 6550/KT88, 2 x ECC82
- Remote Control: IR for volume
- Power Consumption: 200W max
- Dimension: 37.5 x 40 x 18 cm
- Net Weight: 40 lbs
