When we tested different amplifiers in the listening room of the audio shop, we always listened to the tracks we were familiar with, and unfortunately, we couldn't detect any sound that felt distorted. The amplifier's sound was so cold, yet smooth, that switching the DAC revealed a significant difference. And even though it wasn't the loud sound I originally preferred, I couldn't deceive myself. It was a good sound—far from the harsh, abrasive kind that annoys the ears. Thank you for your concern.