Unison Research S6

The S6 BE delivers a classic pure Class-A sound, which is known for being rich, warm, and highly expressive. Because it uses an ultralinear circuit, you get that signature tube liquidity while maintaining excellent control and detail across the frequency range.

The S6 BE produces 40 watts per channel into 6 ohms. While this is plenty for most high-sensitivity or medium-efficiency speakers, it is best suited for listening environments where you don't need extreme volume levels, allowing the Class-A design to shine.

Yes, the S6 BE includes an unfiltered stereo subwoofer output. This allows you to easily integrate a powered subwoofer to extend the low-end performance of your system without needing a separate crossover.

The 'BE' designation indicates significant refinements, specifically the use of premium Gold Lion tubes and an upgraded power management system. These changes, combined with advanced grounding technology, result in a lower noise floor and a more stable, interference-free signal path.

Yes, the S6 BE is versatile enough to handle digital sources directly. It features USB, coaxial SPDIF, and Toslink optical inputs, allowing you to connect streamers, computers, or CD transports without needing an external DAC.

Like any high-end tube amplifier, you will eventually need to replace the tubes as they wear out, typically after several thousand hours of use. The S6 BE uses high-quality Gold Lion tubes, which are widely available and easy to source when the time comes for a refresh.