Abstract: Methods and apparatus provide for: a rectification circuit operating to convert a source of AC power into a final DC power source; a rectification filtering capacitance operating to at least partially smooth a voltage of the final DC power source, which exhibits a voltage sag and recovery characteristic in response to time-variant current drawn therefrom; a power amplification circuit drawing power from the final DC power source and producing an output signal, for driving a speaker, having audible characteristics influenced by the voltage sag and recovery characteristic of the final DC power source; and a control circuit operating to continuously vary, in response to user input, one or more parameters of the voltage sag and/or recovery characteristic of the final DC power source.

Abstract: An assembly and a system for improving the cleanliness of a facility. A flexible trash receptacle uses a trash bag which is attached to the bottom of the folding seat via an extension flap and seat attachment. When the seat is in the closed position, the trash bag flexes back toward the seat to allow unobstructed passage. When the seat is lowered to the open position, the trash bag flexes forward and hangs down from the bottom of the folding seat. The extension flap allows the user to have improved access to the opening in the trash bag by distancing the opening in the trash bag from the bottom of the seat. In one embodiment, the trash receptacle is located closer to the forward edge of the folding seat by using an adhesive on the front side of the seat attachment. Optional sealing methods such as plastic zip lock seals can be used to securely close the trash receptacle when full.