Advances in Impedance Measurement of Loudspeakers and Headphones

Temme S, Scott T. Advances in Impedance Measurement of Loudspeakers and Headphones. In: AES Convention 135. Audio Engineering Society; 2013. Paper 8991. Available from: https://aes.org/publications/elibrary-page/?id=17039

@inproceedings{Temme2013_17039,
  author = {Temme, Steve and Scott, Tony},
  title = {{Advances in Impedance Measurement of Loudspeakers and Headphones}},
  booktitle = {AES Convention 135},
  note = {Paper 8991},
  year = {2013},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=17039}
}

TY  - CPAPER
TI  - Advances in Impedance Measurement of Loudspeakers and Headphones
AU  - Temme, Steve
AU  - Scott, Tony
T2  - AES Convention 135
M1  - Paper 8991
PY  - 2013
DA  - 2013/10/06
UR  - https://aes.org/publications/elibrary-page/?id=17039
PB  - Audio Engineering Society
LA  - en
AB  - Impedance measurement is often the sole electrical measurement in a battery of QC tests on loudspeakers and headphones. Two test methods are commonly used—single channel and dual channel. Dual Channel measurement offers greater accuracy as both the voltage across the speaker (or headphone) and the reference resistor are measured to calculate the impedance. Single Channel measurement methods are more commonly used on the production line because it only requires one channel of a stereo soundcard, which leaves the other free for simultaneous acoustic tests. They are less accurate, however, due to the test methods making assumptions of constant voltage or constant current. In this paper we discuss a novel electrical circuit that offers similar impedance measurement accuracy compared to complex dual channel measurement methods but using just one channel. This is expected to become popular for high throughput production line measurements where only one channel is available as the second channel of the typical soundcard is being used for simultaneous acoustic tests.
ER  -