N. E. Iversen, H. Schneider, A. Knott, and M. A. E. Andersen, “Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers,” in Proc. AES Convention 139, Oct. 2015, Paper 9377. [Online]. Available: https://aes.org/publications/elibrary-page/?id=17935
Iversen NE, Schneider H, Knott A, Andersen MAE. Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers. In: AES Convention 139. Audio Engineering Society; 2015. Paper 9377. Available from: https://aes.org/publications/elibrary-page/?id=17935
@inproceedings{Iversen2015_17935,
author = {Iversen, Niels Elkjær and Schneider, Henrik and Knott, Arnold and Andersen, Michael A. E.},
title = {{Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers}},
booktitle = {AES Convention 139},
note = {Paper 9377},
year = {2015},
month = oct,
publisher = {Audio Engineering Society},
url = {https://aes.org/publications/elibrary-page/?id=17935}
}
TY - CPAPER
TI - Efficiency Investigation of Switch-Mode Power Audio Amplifiers Driving Low Impedance Transducers
AU - Iversen, Niels Elkjær
AU - Schneider, Henrik
AU - Knott, Arnold
AU - Andersen, Michael A. E.
T2 - AES Convention 139
M1 - Paper 9377
PY - 2015
DA - 2015/10/06
UR - https://aes.org/publications/elibrary-page/?id=17935
PB - Audio Engineering Society
LA - en
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.
ER -
