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RE: horn speaker placement

When a loudspeaker has directivity, it is also usually loudest directly on axis.
Horns normally have more directivity that direct radiators and so are in effect focusing the energy forward and not so much to the sides and rear. Ideally this is the same across the band but usually there is a significant change in pattern with frequency.
With horns in a stereo or in commercial sound where this principal is from, one can widen the sweet spot. If you have a couch, air the right speaker at the left seat and vis versa. This way the loudest part of the radiation is aimed at the farthest seat. Might take a little tinkering but this does work. Also from the center seat, use a tape measure and set the speakers the same or close to as the same distance from the listening position. Stereo image is partly time information and not skewing time by having significantly different distances to each source when at the center is not good, the mono phantom is what you get when what reaches both ears is identical in time and identical enough to fool you into perceiving a Center image instead of two sources. When a loudspeaker radiates "simply" enough, one can make a mono phantom so strong you don't notice there is a right and left source, something like with headphones except it's in front of you and not in your head.
Best,
Tom


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