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<blockquote data-quote="Declan Slater" data-source="post: 137862" data-attributes="member: 964">Re: dB calculationsNifty topic... now there are four different situations discussed here:#1: single speaker; double the power to it from an amp= 3Db output gain. #2: single powered speaker + identical single powered speaker = 3 Db output gain.#3: coupling effect of multiple speakers, that changes the polar pattern outputs in a more directional mannor, such as seen in a line array, where the vertical axis is narrow, but the horizontal is wide (inverse square law drop changes from 9Db/doubling distance to 6Db drop/doubling distance.#4: coupling effect of multiple speakers, not in correct phase, or out of time alignment - effecting combined total output pattern in a destructive mannor.&nbsp; I don&#039;t think anyone has covered the coupling effect of multiple speakers, and coupling effects of walls, floors and corners yet on this topic, but that may be too off topic.</blockquote>

[QUOTE="Declan Slater, post: 137862, member: 964"] Re: dB calculations Nifty topic... now there are four different situations discussed here:#1: single speaker; double the power to it from an amp= 3Db output gain. #2: single powered speaker + identical single powered speaker = 3 Db output gain.#3: coupling effect of multiple speakers, that changes the polar pattern outputs in a more directional mannor, such as seen in a line array, where the vertical axis is narrow, but the horizontal is wide (inverse square law drop changes from 9Db/doubling distance to 6Db drop/doubling distance.#4: coupling effect of multiple speakers, not in correct phase, or out of time alignment - effecting combined total output pattern in a destructive mannor. I don't think anyone has covered the coupling effect of multiple speakers, and coupling effects of walls, floors and corners yet on this topic, but that may be too off topic. [/QUOTE]

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