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Low Earth Orbit
DIY Audio
A not so DIY line array
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<blockquote data-quote="Peter Morris" data-source="post: 209877" data-attributes="member: 652"><p>@Helge</p><p></p><p>They are performing very well. We used them on the weekend for a very important show. Typically they only use d&b, L-Acoustics and Meyer in that venue. At sound check they seemed very impressed but I have not had a report back about the show yet.</p><p></p><p>In terms of SPL, the TPL200H has more output than a single 8” driver. With a line-array it’s a different. I think it’s a good match in this case, but I have not had an opportunity to really see what it can do.</p><p></p><p>It also depends on how many boxes in the array and what crossover frequency you select. In this case I’m crossing them quite low to ensure good pattern control.</p><p></p><p>@ Timo –</p><p></p><p>It’s a single 8” and horn. I made all the boxes the same but the fly-ware makes it very easy to invert one array so if needed the array can be symmetrical.</p><p></p><p>The problem using a dual 8”, with an 8” driver either side of the horn is maintaining a good horizontal pattern, I can get too narrow because of the spacing of the 8” drivers has a dipole action.</p><p></p><p>The problem with a single 8” and horn is the parallax error that causes a time off-set as you move off axis and the resulting radiation errors. If you can space the horn and LF driver so they are less than about half a wavelength at the crossover frequency and use very high slope crossover the radiation error is minimal.</p><p></p><p>You will also need to use a wave guide (plus horn flare) like this; <a href="http://www.eighteensound.it/Portals/0/PDFs/XG10.PDF" target="_blank">http://www.eighteensound.it/Portals/0/PDFs/XG10.PDF</a> with your 2425's</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 209877, member: 652"] @Helge They are performing very well. We used them on the weekend for a very important show. Typically they only use d&b, L-Acoustics and Meyer in that venue. At sound check they seemed very impressed but I have not had a report back about the show yet. In terms of SPL, the TPL200H has more output than a single 8” driver. With a line-array it’s a different. I think it’s a good match in this case, but I have not had an opportunity to really see what it can do. It also depends on how many boxes in the array and what crossover frequency you select. In this case I’m crossing them quite low to ensure good pattern control. @ Timo – It’s a single 8” and horn. I made all the boxes the same but the fly-ware makes it very easy to invert one array so if needed the array can be symmetrical. The problem using a dual 8”, with an 8” driver either side of the horn is maintaining a good horizontal pattern, I can get too narrow because of the spacing of the 8” drivers has a dipole action. The problem with a single 8” and horn is the parallax error that causes a time off-set as you move off axis and the resulting radiation errors. If you can space the horn and LF driver so they are less than about half a wavelength at the crossover frequency and use very high slope crossover the radiation error is minimal. You will also need to use a wave guide (plus horn flare) like this; [URL]http://www.eighteensound.it/Portals/0/PDFs/XG10.PDF[/URL] with your 2425's [/QUOTE]
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A not so DIY line array
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