SoundBarrel bluetooth speaker is beautiful-looking sound system that will appeal to many people on different levels. This warm and natural looking speaker with silver-tone detailing will attract those who are tired of digital life. The most exciting feature is the cover. An iris diaphragm, which is commonly used on cameras to regulate the amount of light admitted to a lens, is applied to this speaker that now it regulates the amount of sound coming out from this “barrel”. So this iris diaphragm not only controls volume in detail, but also act as a sound equalizer with this wood material. As you adjust the hole with your hand, it changes the quality of the audio tone that passes through it.