High-Fidelity PWM Based Amplifier Concept for Active Speaker Systems with a Very Low-Energy Consumption

Nielsen K. High-Fidelity PWM Based Amplifier Concept for Active Speaker Systems with a Very Low-Energy Consumption. In: AES Convention 100. Audio Engineering Society; 1996. Paper 4259. Available from: https://aes.org/publications/elibrary-page/?id=7516

@inproceedings{Nielsen1996_7516,
  author = {Nielsen, Karsten},
  title = {{High-Fidelity PWM Based Amplifier Concept for Active Speaker Systems with a Very Low-Energy Consumption}},
  booktitle = {AES Convention 100},
  note = {Paper 4259},
  year = {1996},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=7516}
}

TY  - CPAPER
TI  - High-Fidelity PWM Based Amplifier Concept for Active Speaker Systems with a Very Low-Energy Consumption
AU  - Nielsen, Karsten
T2  - AES Convention 100
M1  - Paper 4259
PY  - 1996
DA  - 1996/05/06
UR  - https://aes.org/publications/elibrary-page/?id=7516
PB  - Audio Engineering Society
LA  - en
AB  - This paper addresses various aspects on the realization of dedicated pulse-width modulation (PWM) based amplifiers for active loudspeaker systems, optimized in respect to energy consumption. A new amplifier concept, dedicated to woofer/: midrange (0-4.5-kHz) loads, has been developed. The concept is based on a novel feedback topology, a modulation strategy that is dependent of bandwidth and the use of a switching frequency as low as 44.1 kHz without compromising the sound quality. Detailed measurements on a 250-W example implementation are given. THD+N <0.1% is realized at all output powers and frequencies, and the reduction in energy consumption is around 90% compared with an equivalent conventional Class-AB amplifier.
ER  -