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converting speaker level to line level
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<blockquote data-quote="Geoff Doane" data-source="post: 72217" data-attributes="member: 1155"><p>Re: converting speaker level to line level</p><p></p><p></p><p></p><p>It doesn't even have to be a 70V system for that matter. The transformer doesn't care what is feeding it, as long as certain voltages or power levels aren't exceeded. If it really is a backstage speaker, I can't see that exceeding anything.</p><p></p><p>As an example, 2W at 8Ω is 4V, which is +14 dBu. But that's not a steady state signal, so if we assume there's 10 dB of headroom, your average level is +4 dBu, or just about exactly what we often consider to be "line level". So IF you were pushing a 2W peak level into that speaker, a 1:1 transformer on the old speaker wire is likely about right to interface with a line input. You don't strictly need the transformer, but it's a good idea in order to isolate the grounds of the two systems, and the output will now be balanced.</p><p></p><p>If you really do have a 70V system, then a transformer with a 2W tap would be a good one to use. This ends up being a 17.5:1 ratio, if you're keeping score.</p><p></p><p>That's about the same ratio as a typical direct box (20KΩ to 600Ω), but I suspect a transformer designed for speakers will be less expensive, as well as being rated to handle those kinds of voltages. The other problem with a direct box is that they typically output a "mic" level, and Justice says he's looking for "line" level.</p><p></p><p>GTD</p></blockquote><p></p>
[QUOTE="Geoff Doane, post: 72217, member: 1155"] Re: converting speaker level to line level It doesn't even have to be a 70V system for that matter. The transformer doesn't care what is feeding it, as long as certain voltages or power levels aren't exceeded. If it really is a backstage speaker, I can't see that exceeding anything. As an example, 2W at 8Ω is 4V, which is +14 dBu. But that's not a steady state signal, so if we assume there's 10 dB of headroom, your average level is +4 dBu, or just about exactly what we often consider to be "line level". So IF you were pushing a 2W peak level into that speaker, a 1:1 transformer on the old speaker wire is likely about right to interface with a line input. You don't strictly need the transformer, but it's a good idea in order to isolate the grounds of the two systems, and the output will now be balanced. If you really do have a 70V system, then a transformer with a 2W tap would be a good one to use. This ends up being a 17.5:1 ratio, if you're keeping score. That's about the same ratio as a typical direct box (20KΩ to 600Ω), but I suspect a transformer designed for speakers will be less expensive, as well as being rated to handle those kinds of voltages. The other problem with a direct box is that they typically output a "mic" level, and Justice says he's looking for "line" level. GTD [/QUOTE]
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