Hi All,
Could a knowledgeable someone give me a quick assist?
When calculating EPR for speaker tap settings, the AVIXA CTS-D exam guide uses 20*log(distance) to determine the dB lost due to the inverse square law.
My question: when calculating this for an in-ceiling speaker pattern with overlap, should I be using the distance to the edge of the dispersion cone, or the distance to the point where the neighboring loudspeaker provides equal loudness?
Any insight would be welcome.
Best,
Chris
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Hi Chris - Good question; and the way you've phrased it shows you have a good understanding of the topic. As you reference it's about accounting for max dB loss from source to listener(s). Assuming uniform coverage pattern and listener positions your second choice - "...where the neighboring loudspeaker provides equal coverage" makes sense. But for listener positions (if any) around outside edges of the coverage pattern area it could be your first choice; "..edge of dispersion cone". Given headroom is also part of the equation, can't hurt to use that as the larger of the two.
I never did properly thank Greg for his helpful reply. Thank you Greg!