Design of Efficient Sound Systems for Low Voltage Battery Driven Applications

Research output: Research - peer-reviewArticle in proceedings – Annual report year: 2016


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The efficiency of portable battery driven sound systems is crucial as it relates to both the playback time and cost of the system. This paper presents design considerations when designing such systems. This include loudspeaker and amplifier design. Using a low resistance voice coil realized with rectangular wire one can boost the efficiency of the loudspeaker driver and eliminate the need of an additional power supply. A newly developed switching topology is described which is beneficial to near-idle efficiency (< 2 W), which is crucial for real audio applications in the consumer electronics space. A small sized sound system was implemented using the discussed design considerations. The amplifier efficiency performance was found to be very high with near-idle efficiency reaching a remarkably 88% at 2 W. The average output SPL was estimated to be up to 90 dB in half spheric anechoic conditions. Measured results are compared with current state-of-art and shows a 14% points efficiency improvement
Original languageEnglish
Title of host publicationProceedings of the 141st Audio Engineering Convention Convention
Number of pages7
PublisherAudio Engineering Society
Publication date2016
StatePublished - 2016
Event141st Audio Engineering Society Convention - Los Angeles, CA, United States
Duration: 29 Sep 20162 Oct 2016


Conference141st Audio Engineering Society Convention
CountryUnited States
CityLos Angeles, CA
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ID: 126987351