Efficiency Investigation of Switch Mode Power Amplifier Drving Low Impedance Transducers

Niels Elkjær Iversen, Henrik Schneider, Arnold Knott, Michael A. E. Andersen

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The typical nominal resistance span of an electro dynamic transducer is 4 Ω to 8 Ω. This work examines the possibility of driving a transducer with a much lower impedance to enable the amplifier and loudspeaker to be directly driven by a low voltage source such as a battery. A method for estimating the amplifier rail voltage requirement as a function of the voice coil nominal resistance is presented. The method is based on a crest factor analysis of music signals and estimation of the electrical power requirement from a specific target of the sound pressure level. Experimental measurements confirms a huge performance leap in terms of efficiency compared to a conventional battery driven sound system. Future optimization of low voltage, high current amplifiers for low impedance loudspeaker drivers are discussed.
Original languageEnglish
Title of host publicationProceedings of the139th Audio Engineering Society Convention.
Number of pages8
PublisherAudio Engineering Society
Publication date2015
Publication statusPublished - 2015
Event139th International Audio Engineering Society (AES) Convention - The Jacob Javits Center, New York City, United States
Duration: 29 Oct 20151 Nov 2015


Conference139th International Audio Engineering Society (AES) Convention
LocationThe Jacob Javits Center
Country/TerritoryUnited States
CityNew York City
Internet address


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