![]() The speaker system of claim 4 wherein the gas emitter includes a mineral containing uranium or thorium that decays to emit helium. The speaker system of claim 2 further comprising a gas emitter within the gas cavity to replenish leaked gas. ![]() The speaker system of claim 2 wherein the gas is selected from a group consisting of helium and hydrogen. ![]() The speaker system of claim 1 wherein the gas cavity contains a gas that is less dense than air, and no air. ![]() A rigid enclosure made of gas-impermeable material and having an interior partition to separate a gas cavity and an air cavity, the interior partition having a first opening to the gas cavity sealed by a gas-impermeable flexible membrane comprising a sheet of material that extends across the first opening, the enclosure having a second opening to the gas cavity, the diaphragm being coupled to the enclosure through a gas-impermeable suspension member wherein the second opening is sealed by the suspension member and the diaphragm, the enclosure having a vent hole to allow air to travel into and out of the air cavity for barometric pressure equalization. ![]()
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May 2023
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