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Low Earth Orbit
Lighting & Electrical
AC line loss causes hum
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<blockquote data-quote="Scott Helmke" data-source="post: 82940" data-attributes="member: 96"><p>Re: AC line loss causes hum</p><p></p><p>We did try a transformer, but it was not any more effective than adding a second circuit (that big extension cable). Did not really have the opportunity to try a different input topology, though. I forgot the make/model, but it was a relatively recent professional rack DSP unit. Changing outputs at the monitor console (direct from the console, or through outboard graphic EQ) did not make a difference.</p><p></p><p>Now as it happens that was a big enough church to have their own electrician, so adding a couple more circuits was no big deal. In this situation it seems to me that adding stuff in the audio chain would be considered a band-aid, versus clearing up the problem by improving the electrical supply.</p></blockquote><p></p>
[QUOTE="Scott Helmke, post: 82940, member: 96"] Re: AC line loss causes hum We did try a transformer, but it was not any more effective than adding a second circuit (that big extension cable). Did not really have the opportunity to try a different input topology, though. I forgot the make/model, but it was a relatively recent professional rack DSP unit. Changing outputs at the monitor console (direct from the console, or through outboard graphic EQ) did not make a difference. Now as it happens that was a big enough church to have their own electrician, so adding a couple more circuits was no big deal. In this situation it seems to me that adding stuff in the audio chain would be considered a band-aid, versus clearing up the problem by improving the electrical supply. [/QUOTE]
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