For the price you get headphones with a beautiful appearance, this method as a zip idea is mesmerizing. But qualitatively lags behind the whole thing, of course ... The sound is horrible compared to equally-priced headphones from Pioneer or Samsung for example. Since no EQ controls more.
Conclusion: Elegant design, cool idea, but to have to lousy sound to enjoy it. Hang with me only decorative technically on the wall. oo