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NI. EL. Iversen, H. Schneider, A. Knott, and MI. E.. Andersen, "Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers," Paper 9377, (2015 October.). doi: NI. EL. Iversen, H. Schneider, A. Knott, and MI. E.. Andersen, "Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers," Paper 9377, (2015 October.). doi:
Abstract: The typical nominal resistance span of an electro dynamic transducer is 4 Ohms to 8 Ohms. 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 confirm 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.

@article{iversen2015efficiency,
author={iversen, niels elkjær and schneider, henrik and knott, arnold and andersen, michael a. e.},
journal={journal of the audio engineering society},
title={efficiency investigation of switch-mode power audio amplifiers driving low impedance transducers},
year={2015},
volume={},
number={},
pages={},
doi={},
month={october},} @article{iversen2015efficiency,
author={iversen, niels elkjær and schneider, henrik and knott, arnold and andersen, michael a. e.},
journal={journal of the audio engineering society},
title={efficiency investigation of switch-mode power audio amplifiers driving low impedance transducers},
year={2015},
volume={},
number={},
pages={},
doi={},
month={october},
abstract={the typical nominal resistance span of an electro dynamic transducer is 4 ohms to 8 ohms. 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 confirm 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.},}

TY - paper
TI - Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers
SP - EP -
AU - Iversen, Niels Elkjær
AU - Schneider, Henrik
AU - Knott, Arnold
AU - Andersen, Michael A. E.
PY - 2015
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 2015 TY - paper
TI - Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers
SP - EP -
AU - Iversen, Niels Elkjær
AU - Schneider, Henrik
AU - Knott, Arnold
AU - Andersen, Michael A. E.
PY - 2015
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - October 2015
AB - The typical nominal resistance span of an electro dynamic transducer is 4 Ohms to 8 Ohms. 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 confirm 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.