Abstract: An acoustic enclosure system for a loudspeaker includes a vent chamber adjacent to and spanning at least one chamber assembly. A loudspeaker is mounted in each of the chamber assemblies such that the speakers face away from each other when there are more than one speaker. The vent chamber has a port in a side wall that is open to the outside of the enclosure. Each chamber assembly has a port opening to the vent chamber and contains a fluid chamber with a flexible bladder that is filled with fluid and maintained in the chamber assembly a given distance from the corresponding loudspeaker. Each bladder contacts the interior surfaces of the side walls that form the fluid chamber. A flexible support is provided underneath each bladder so that the bladder is substantially maintained a specified distance from the wall supporting the speaker.

Abstract: A massage apparatus includes a flexible bladder filled with a fluid and a plurality of bladder displacement devices coupled to the flexible bladder for displacing the flexible bladder in accordance with a specified displacement plan. A signal source is coupled to the bladder displacement devices to provide the specified displacement plan. The signal source outputs first and second frequency modulated (FM) signals. The FM signals are identical in spectrum and start at zero phase, but are propagated 180.degree. out-of-phase with respect to one another. The first FM signal is fed to one half of the bladder displacement devices and the second FM signal is fed to the other half of bladder displacement devices. The FM signals are controlled in such a way that vibrational energy travels in the fluid-filled bladder for coupling to a user reclined on the bladder while ambient vibration of the apparatus is canceled.