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J. Stewart, "Detection and Diagnoses of Subharmonic Tones Generated in Woofers," Paper 5741, (2003 March.). doi: J. Stewart, "Detection and Diagnoses of Subharmonic Tones Generated in Woofers," Paper 5741, (2003 March.). doi:
Abstract: An audible anomaly was heard while evaluating a woofer loudspeaker excited with sinusoidal wave signals. Standard testing did not reveal the nature or cause of this unusual sound. Further investigation showed the loudspeaker was producing a frequency component at half the input frequency; a sub-harmonic. Reported cases of sub-harmonic production are rare for woofers; most reports concern compression drivers. In this paper the techniques used to confirm the generation of a sub-harmonic in this woofer are presented. The mechanisms that combined to generate the sub-harmonic are shown. Further examples found in other speakers that exhibit this sound anomaly on occasion are also discussed.

@article{stewart2003detection,
author={stewart, john},
journal={journal of the audio engineering society},
title={detection and diagnoses of subharmonic tones generated in woofers},
year={2003},
volume={},
number={},
pages={},
doi={},
month={march},} @article{stewart2003detection,
author={stewart, john},
journal={journal of the audio engineering society},
title={detection and diagnoses of subharmonic tones generated in woofers},
year={2003},
volume={},
number={},
pages={},
doi={},
month={march},
abstract={an audible anomaly was heard while evaluating a woofer loudspeaker excited with sinusoidal wave signals. standard testing did not reveal the nature or cause of this unusual sound. further investigation showed the loudspeaker was producing a frequency component at half the input frequency; a sub-harmonic. reported cases of sub-harmonic production are rare for woofers; most reports concern compression drivers. in this paper the techniques used to confirm the generation of a sub-harmonic in this woofer are presented. the mechanisms that combined to generate the sub-harmonic are shown. further examples found in other speakers that exhibit this sound anomaly on occasion are also discussed.},}

TY - paper
TI - Detection and Diagnoses of Subharmonic Tones Generated in Woofers
SP - EP -
AU - Stewart, John
PY - 2003
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - March 2003 TY - paper
TI - Detection and Diagnoses of Subharmonic Tones Generated in Woofers
SP - EP -
AU - Stewart, John
PY - 2003
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - March 2003
AB - An audible anomaly was heard while evaluating a woofer loudspeaker excited with sinusoidal wave signals. Standard testing did not reveal the nature or cause of this unusual sound. Further investigation showed the loudspeaker was producing a frequency component at half the input frequency; a sub-harmonic. Reported cases of sub-harmonic production are rare for woofers; most reports concern compression drivers. In this paper the techniques used to confirm the generation of a sub-harmonic in this woofer are presented. The mechanisms that combined to generate the sub-harmonic are shown. Further examples found in other speakers that exhibit this sound anomaly on occasion are also discussed.