UNISON RESEARCH S6 BLACK EDITION

Preowned. In excellent condition. Free of any noticeable signs of wear. Comes with remote control and original packaging.

8 months old.

The Unison S6 Black Edition is a valve integrated amplifier that masterfully combines artisanal tradition with technological innovation, representing one of the highest achievements in Italian high-fidelity audio. Every detail is designed to deliver a natural, dynamic, and highly detailed sound, starting with the exclusive use of KT77 Genalex Gold Lion power tubes, chosen for their linearity, three-dimensionality, and ability to reproduce deep bass and crystal-clear highs. The preamplifier tubes, ECC83 and ECC82, complete the amplifier’s core, ensuring precision and a wide, well-defined soundstage.

The S6 Black Edition abandons the traditional Auto-Bias system, eliminating cathode capacitors and allowing the tubes to fully exploit their power, resulting in roughly 15% more total output and deeper, more controlled bass reproduction. The separate and independent power supply for each tube, combined with the use of polypropylene capacitors alongside traditional electrolytic ones, ensures stability, fast transient response, and exceptional frequency linearity.

Input selection is handled via relays with Return GND technology and gold-plated silver contacts, minimizing crosstalk and interference while providing perfect isolation between channels and uncompromised sound clarity. The stereo subwoofer output, derived directly from the amplifier’s main output, allows seamless integration of a subwoofer without altering the tonal balance. Meanwhile, the three digital inputs (USB, optical and coaxial SPDIF) support up to 384 kHz and DSD 256, with conversion handled by the prestigious Sabre ES908K2M DAC, delivering faithful and detailed reproduction even with high-resolution digital formats.

Aesthetically, the S6 Black Edition combines elegance and durability: the front panel is crafted from glossy lacquered wood, carefully treated to enhance the natural beauty of the material while providing long-lasting protection. The black gun metal finishes offer exceptional resistance and a refined, contemporary look. The combination of premium materials, artisanal craftsmanship, and advanced technological solutions makes the S6 Black Edition a top-tier amplifier, perfectly embodying the historic DNA of Unison Research while meeting the demands of modern music listening.

In every aspect, from the carefully selected tubes to the design choices that minimize interference and the luxurious finishes, the Unison S6 Black Edition demonstrates how a valve amplifier can seamlessly blend tradition, innovation, and uncompromising sound performance, representing the pinnacle of Italian high-fidelity excellence.

Technical specifications:

• Circuit design: Dual Mono for optimal channel separation
• Power tubes: 6x KT77 Genalex Gold Lion for smooth and natural sound
• Signal tubes: ECC83 Genalex Gold Lion for a wide and detailed soundstage
• Power output: 40 W per channel in Class A
• Cathode Capacitor Less technology: Eliminates cathode capacitors for faster and more detailed response
• Inputs: 4 RCA inputs
• Subwoofer output: Stereo, unfiltered, derived from the amplifier output
• Digital section: 3 inputs (USB 384 kHz, DSD 256, optical and coaxial SPDIF up to 192 kHz)
• DAC converter: Sabre ES908K2M for excellent conversion quality
• Dimensions: 35 x 22 x 50 cm
• Weight: 35 kg