Abstract: A portable speaker having a speaker housing which vibrates in harmony with the audible sounds generated by the speaker. The speaker includes a loud speaker housing having a surface capable of vibrating and a speaker cone which vibrates within said housing to generate audible sound during the speaker's operation. A propagation member which has a first contact surface in contact with the speaker cone, and a second contact surface which is in contact with the vibration surface of the speaker housing is responsible for transmitting the cone vibrations to the housing surface. The transmitted vibrations causes the surface to vibrate in harmony with the audible sounds created by the speaker.