Traditional thinking suggests that the human ear can only audibly hear up to 20,000 Hz. So why build a product with reproduction capability to 40,000 Hz? The answer is simple. While we can only audibly hear to 20,000 Hz, there is musical harmonic content well beyond. These higher frequencies harmonics give music texture, presents, and the airiness of a live performance. It is those higher frequencies that give music emotion and touches your other senses. They excite the hair follicles on your arms¦ your legs¦ the back of your neck. It makes your audio system sound like you are sitting in front of a live performance.