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<blockquote data-quote="Lisa Lane-Collins" data-source="post: 141105" data-attributes="member: 2967">Re: Going digital for installationsWell, this Is interesting feedback!! The longest run is around 80 metres.I had buzz, neutralised with a buzz box, I had hum, got rid of it with passive DIs. So the signal chain is looking like Source-long cable-DI-buzzbox-zone controller (usually, the zone controller is currently off for repairs so currently running through a zed12FX).At the end of this I didn&#039;t have much volume to play with so I&#039;m using spare channels on a mini DSP to boost the signal.The rack has been moved a few times so the long runs of xlr have been extended. For this particular signal source, the run has been cobbled together from old infrastructure too, some of which is unbalanced (the cable that runs behind the wall from the wall plate to the cellar).It was working fine for a long time, then I lost the zone controller to the repair shop and running that signal through a buzz box and into the zed12fx (via RCA) makes for massive hum. When I add in the DI I get rid of the hum but am left with a mid high frequency crackle. I&#039;m going in today to break it down connection by connection and try and pin point where the noise originates from.On a bit of a tangent, is it normal for installations to experience this kind of entropy? This trouble run used to plug straight into the zone controller with just an XLR to RCA adapter. Then there was low level buzz so I added in the buzz box. Now massive hum. I feel like I&#039;ve been doing the same job over and over again. (Although writing it down now I&#039;m thinking that might have something to do with the fact I didn&#039;t run my own cables).</blockquote>

[QUOTE="Lisa Lane-Collins, post: 141105, member: 2967"] Re: Going digital for installations Well, this Is interesting feedback!! The longest run is around 80 metres. I had buzz, neutralised with a buzz box, I had hum, got rid of it with passive DIs. So the signal chain is looking like Source-long cable-DI-buzzbox-zone controller (usually, the zone controller is currently off for repairs so currently running through a zed12FX). At the end of this I didn't have much volume to play with so I'm using spare channels on a mini DSP to boost the signal. The rack has been moved a few times so the long runs of xlr have been extended. For this particular signal source, the run has been cobbled together from old infrastructure too, some of which is unbalanced (the cable that runs behind the wall from the wall plate to the cellar). It was working fine for a long time, then I lost the zone controller to the repair shop and running that signal through a buzz box and into the zed12fx (via RCA) makes for massive hum. When I add in the DI I get rid of the hum but am left with a mid high frequency crackle. I'm going in today to break it down connection by connection and try and pin point where the noise originates from. On a bit of a tangent, is it normal for installations to experience this kind of entropy? This trouble run used to plug straight into the zone controller with just an XLR to RCA adapter. Then there was low level buzz so I added in the buzz box. Now massive hum. I feel like I've been doing the same job over and over again. (Although writing it down now I'm thinking that might have something to do with the fact I didn't run my own cables). [/QUOTE]

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