Blonder, Greg2019-07-112019-07-112014-12-112014-08-26Greg Blonder. "Amplified headphone system with integrated power amplifier." U.S. Patent Application 14/468,984.US20140363016A1https://hdl.handle.net/2144/36518A music playing and listening apparatus including at least one speaker, the speaker having at least two listening modes, at least one mode switch, at least one amplifier, at least one power source, and at least one power diversion switch.Mechanical switchesElectronic switchesControl elementsPatent429724