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<blockquote data-quote="Brad Weber" data-source="post: 65355" data-attributes="member: 114">Re: First time Centre SubsMaybe I missed it but why are you doing this and what are you hoping to achieve by it?&nbsp; Is this just to experiment or are you trying to get some specific result or advantage from it?&nbsp; It seems that what you do might be very dependent on the result you are hoping to obtain.It also seems like you aren&#039;t really looking at a single center array of subs but rather at four subs distributed in some fashion over a distance to either side of the centerline along with two box arrays under each main.&nbsp; That makes it sems like you may have some specific goal in mind in terms of the resulting directivity, but it is not clear what that goal may be.FWIW, full coupling occurs with no separation while 1/4 wavelength separation relates to the nominal 3dB increase for two random sources of equal level.&nbsp; That&#039;s why the &quot;less than or under 1/4 wavelength&quot; and &quot;up to 3dB&quot; caveats relating to coupling.&nbsp; Also, keep in mind that the coupling and interaction is acoustic and since crossovers are not hard wall electronic or acoustic filters, the subwoofers will likely have output above the crossover point, and mains below the crossover point, whose acoustic interaction may be relevant.&nbsp; This is even more of a factor if you run the subs hotter than the mains as that can shift up the effective acoustic crossover and thus raise the highest frequencies relevant to the subs.</blockquote>

[QUOTE="Brad Weber, post: 65355, member: 114"] Re: First time Centre Subs Maybe I missed it but why are you doing this and what are you hoping to achieve by it? Is this just to experiment or are you trying to get some specific result or advantage from it? It seems that what you do might be very dependent on the result you are hoping to obtain. It also seems like you aren't really looking at a single center array of subs but rather at four subs distributed in some fashion over a distance to either side of the centerline along with two box arrays under each main. That makes it sems like you may have some specific goal in mind in terms of the resulting directivity, but it is not clear what that goal may be. FWIW, full coupling occurs with no separation while 1/4 wavelength separation relates to the nominal 3dB increase for two random sources of equal level. That's why the "less than or under 1/4 wavelength" and "up to 3dB" caveats relating to coupling. Also, keep in mind that the coupling and interaction is acoustic and since crossovers are not hard wall electronic or acoustic filters, the subwoofers will likely have output above the crossover point, and mains below the crossover point, whose acoustic interaction may be relevant. This is even more of a factor if you run the subs hotter than the mains as that can shift up the effective acoustic crossover and thus raise the highest frequencies relevant to the subs. [/QUOTE]

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