Simple Amplifier for Single Frequency Subwoofer

Filevski VE. Simple Amplifier for Single Frequency Subwoofer. In: AES Convention 127. Audio Engineering Society; 2009. Paper 7839. Available from: https://aes.org/publications/elibrary-page/?id=15034

@inproceedings{Filevski2009_15034,
  author = {Filevski, Vladimir E.},
  title = {{Simple Amplifier for Single Frequency Subwoofer}},
  booktitle = {AES Convention 127},
  note = {Paper 7839},
  year = {2009},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=15034}
}

TY  - CPAPER
TI  - Simple Amplifier for Single Frequency Subwoofer
AU  - Filevski, Vladimir E.
T2  - AES Convention 127
M1  - Paper 7839
PY  - 2009
DA  - 2009/10/06
UR  - https://aes.org/publications/elibrary-page/?id=15034
PB  - Audio Engineering Society
LA  - en
AB  - Frequency mapped amplifier driving single frequency subwoofer is an inexpensive way to add the missing low notes to small satellite loudspeakers. The whole amplifier system consists of a band-pass filter (typically 20-120 Hz), an envelope detector, a single frequency (typically 50-60 Hz) constant amplitude generator, a mixer (which multiplies output from the envelope detector and the single frequency generator) and a conventional power amplifier. The amplifier proposed in this paper unites the functions of the mixer, the generator and the amplifier in a single unit and does not need a DC power supply, but it runs on 50/60 Hz AC power supply, without a rectifier and without big voltage-smoothing capacitors. With an appropriate MOSFETs the proposed amplifier can run directly on the 120V/60Hz mains supply line - without a power transformer, but in that case, it needs a loudspeaker with a sufficiently high impedance on the frequency of 60 Hz in order not to stress output transistors of the amplifier.
ER  -