Apparent Apex Part IV: Direct Radiators

Ureda MS. Apparent Apex Part IV: Direct Radiators. In: AES Convention 92. Audio Engineering Society; 1992. Paper 3324. Available from: https://aes.org/publications/elibrary-page/?id=6809

@inproceedings{Ureda1992_6809,
  author = {Ureda, Mark S.},
  title = {{Apparent Apex Part IV: Direct Radiators}},
  booktitle = {AES Convention 92},
  note = {Paper 3324},
  year = {1992},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=6809}
}

TY  - CPAPER
TI  - Apparent Apex Part IV: Direct Radiators
AU  - Ureda, Mark S.
T2  - AES Convention 92
M1  - Paper 3324
PY  - 1992
DA  - 1992/03/06
UR  - https://aes.org/publications/elibrary-page/?id=6809
PB  - Audio Engineering Society
LA  - en
AB  - The apparent apex issues regarding the measurement of far field polar response at close distances are examined for direct radiators. Earlier apparent apex studies on horn loudspeakers suggest that the location of the apparent apex changes with frequency and that significant measurement errors are obtained when a test microphone is placed too close to a source. The present paper develops and validates a model of a piston in half-space and presents directivity map error as a function of frequency, piston diameter, and microphone distance. Guidelines are offered for directivity measurements made in common-sized anechoic chambers.
ER  -