The analysis of irregularities of the frequency-response curve of indoor or outdoor public address systems showed that such effects were often caused from phase variations in the signal chain when more than one speaker system is in use. Beside the two standards for the pin connection of XLR connectors different phase angles come from filters, equalizers, crossover networks etc. The results of phase measurements and influences of the frequency response are described.
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https://aes2.org/publications/elibrary-page/?id=6862
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