Abstract: An electronic device holder may include a body portion housed within an outer housing. The body portion may include surfaces that form a first cavity configured to receive the electronic device, and a second cavity. A sound transmitting passage can be positioned between the first cavity and the second cavity. The second cavity can passively amplify sound received from the second sound channel of the sound transmitting passage. The body of the electronic device holder can include a first wall, a first partition wall, and a second partition wall. The second wall can be generally parallel to a generally planar bottom surface of the holder and can be positioned between the first wall and the first partition wall so as to define a first cavity. A second cavity can be defined between the second partition wall and the outer housing.