DanielT
Major Contributor
What listening distance will you have? It will dip in higher frequencies, do you think of EQa?
With a straight line source of limited length, problems are obtained because the frequency response becomes distance dependent and also when the receiver position is above the top point of the source. However, these problems can be avoided if the length of the source is infinite, which is the case via infinitely many mirroring effects if one has two ideally reflective surfaces at the ends of the line. Now, of course, floors and ceilings are not completely reflective, but close enough.
When creating a line source with dynamic elements, however, these will together (since the individual contributions are not summed in phase due to the distance differences) give a frequency response that decreases by 3 dB / octave, so you have to equalize all elements with a pitch of 3 dB / octave from a couple of hundred Hz and up. You can thus connect the elements in series parallel in a simple way and then equalize "as usual".
However, one should be aware that the efficiency due to the properties of the scattered source do not become particularly high for high frequencies and that one should therefore be prepared for quite a lot of power being consumed here if one does not choose to use only a single element for the highest frequencies. Here, long band elements have great advantages because they, through their low mass, purely acoustically receive a frequency response, even though the sound pressure contributions from the various sub-elements are not summed in phase here either (unless you listen at a distance of 20-50 meters or so) .
Edit:
If you look at that thread, reference is made to this thread. The Hifi world is still quite small. Especially when it comes to line speakers for home Hifi use.
(no, not me who wrote that post)
With a straight line source of limited length, problems are obtained because the frequency response becomes distance dependent and also when the receiver position is above the top point of the source. However, these problems can be avoided if the length of the source is infinite, which is the case via infinitely many mirroring effects if one has two ideally reflective surfaces at the ends of the line. Now, of course, floors and ceilings are not completely reflective, but close enough.
When creating a line source with dynamic elements, however, these will together (since the individual contributions are not summed in phase due to the distance differences) give a frequency response that decreases by 3 dB / octave, so you have to equalize all elements with a pitch of 3 dB / octave from a couple of hundred Hz and up. You can thus connect the elements in series parallel in a simple way and then equalize "as usual".
However, one should be aware that the efficiency due to the properties of the scattered source do not become particularly high for high frequencies and that one should therefore be prepared for quite a lot of power being consumed here if one does not choose to use only a single element for the highest frequencies. Here, long band elements have great advantages because they, through their low mass, purely acoustically receive a frequency response, even though the sound pressure contributions from the various sub-elements are not summed in phase here either (unless you listen at a distance of 20-50 meters or so) .
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Edit:
If you look at that thread, reference is made to this thread. The Hifi world is still quite small. Especially when it comes to line speakers for home Hifi use.
(no, not me who wrote that post)
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