An excellent and lightning-fast store, and Mike is a true audiophile’s friend: attentive, friendly, and incredibly experienced! From the very beginning, I decided to try the highest-level QSA processing — Crystal Gold — and that decision turned out to be a real revelation for my ears.

As many have noted, the sound of QSA slowly unfolds over the first few weeks: it changes slightly, sometimes sounding brighter, sometimes softer, sometimes the bass disappears, sometimes it comes back — real “ups and downs” in the sound. After about a month, the sound completely “fell into place,” and it’s simply wonderful.

The soundstage opens wide and deep, with every instrument and voice taking its exact place. Vocals float in space, drums and bass gain weight and presence, and the upper registers sparkle with clarity without ever straining the ears. The timbres are rich, textured, and natural, and the microdynamics are stunning: the quietest details are audible like whispers, while the most powerful passages hit precisely, energetically, and without harshness.

What impresses most is the harmony across the entire range, the sense of air, and the lingering decay. They seem to fill the room, creating the feeling of being at a live concert. Every note comes alive, musical phrases flow freely and naturally, without the slightest artificiality. The sound is even, harmonious, and balanced — you just want to close your eyes and immerse yourself in the music. The words that immediately come to mind are “harmonious sound” and “musical sound. ”

Component level upgrade. Highly recommended!