AVIXA CTS Study Group

Question on EPR Calculation - Distance

Looking for insight on proper calculation of electrical power required - specifically which distance to use
Go to the profile of Christopher Eloranta
Christopher Eloranta
AV Design Engineer, AmbianceIQ
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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

Go to the profile of Christopher Eloranta
Christopher Eloranta
AV Design Engineer, AmbianceIQ

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