The Soloist Voyager, paired with the Supercharger 5A power supply, already delivers exceptional performance, and I’d confidently categorize it as a high-end headphone amplifier. But when I swapped the Supercharger 5A for the Fusion Core, the transformation in sound quality was nothing short of extraordinary. Honestly, I didn’t anticipate such a dramatic shift. It felt as though I had upgraded the entire headphone amp to a model in an entirely higher class. With the Fusion Core, the Soloist Voyager becomes vastly more detailed and transparent. The soundstage opens up, becoming more expansive and three-dimensional, while the overall sound gains a new level of authority and dynamism. This upgrade has completely redefined the listening experience for me. In my opinion, with the Fusion Core, the Soloist Voyager is now one of the finest headphone amplifiers I’ve ever encountered.