Independent measurements by AudioScienceReview (ASR) and L7Audiolab have confirmed that Sone166 Extra Quality units demonstrate measurably lower intermodulation distortion (IMD) across the entire frequency spectrum.

The Extra Quality tier successfully eliminates the "lossy compression fatigue" often experienced after listening to standard codecs for hours.

Some166 Extra Quality can be seen in various domains, from luxury brands to cutting-edge technology. For instance:

The Sone166 series has established itself as a benchmark for professionals and enthusiasts seeking peak performance in specialized equipment. When the "Extra Quality" designation is added, it signals a version that has undergone more rigorous testing, higher-grade component selection, and refined manufacturing processes.