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<blockquote data-quote="Craig Hauber" data-source="post: 129573" data-attributes="member: 272">Re: Apart Zone4 Controller introduces irritating noiseI am unfamiliar with the MinDSP (other than I thought it was a bare-board 2ch processor that you supply your own PSU for.)&nbsp; I would suspect that as a possible trouble-spot long before the Zone4.How is the connection between the zone4 and the miniDSP?&nbsp; Balanced?.&nbsp; If so then try lifting the pin1 connection (either via the phoenix connectors if hard-wired or with XLR ground lifts if cable-patched)&nbsp; You may have to experiment with what end of the interconnect you have to lift.You may need an audio transformer in betweenIf it&#039;s unbalanced then you&#039;re probably screwed (just kidding!) But your description of the noise sounds much like one I get using PC laptops with their power supply.&nbsp; (If run on battery only there&#039;s no noise, plugged in charging, lots of buzz!).&nbsp; I&#039;ve found RCA jack equipped &quot;Hum Eliminators&quot; work great for that (Ebtech) and even the Radioshack transformer-equipped rca cable (car stereo) has solved the laptop problem in a pinch.For some additional troubleshooting purposes only try connecting the Zone4 directly to the amps without the DSP.&nbsp; Also try ground-pin lifting on the zone4 (temporarily for testing purposes only) -same goes for the MiniDSP and the amp.&nbsp; (don&#039;t float them all at once though)I&#039;ve spent hours tracing people&#039;s buzz problems before and it usually boils down to an underlying problem with wiring (either mains supply or audio interconnects) or a poorly designed and possibly faulty product -like some home-stereo grade stuff being used in the middle of an install of pro gear.</blockquote>

[QUOTE="Craig Hauber, post: 129573, member: 272"] Re: Apart Zone4 Controller introduces irritating noise I am unfamiliar with the MinDSP (other than I thought it was a bare-board 2ch processor that you supply your own PSU for.) I would suspect that as a possible trouble-spot long before the Zone4. How is the connection between the zone4 and the miniDSP? Balanced?. If so then try lifting the pin1 connection (either via the phoenix connectors if hard-wired or with XLR ground lifts if cable-patched) You may have to experiment with what end of the interconnect you have to lift. You may need an audio transformer in between If it's unbalanced then you're probably screwed (just kidding!) But your description of the noise sounds much like one I get using PC laptops with their power supply. (If run on battery only there's no noise, plugged in charging, lots of buzz!). I've found RCA jack equipped "Hum Eliminators" work great for that (Ebtech) and even the Radioshack transformer-equipped rca cable (car stereo) has solved the laptop problem in a pinch. For some additional troubleshooting purposes only try connecting the Zone4 directly to the amps without the DSP. Also try ground-pin lifting on the zone4 (temporarily for testing purposes only) -same goes for the MiniDSP and the amp. (don't float them all at once though) I've spent hours tracing people's buzz problems before and it usually boils down to an underlying problem with wiring (either mains supply or audio interconnects) or a poorly designed and possibly faulty product -like some home-stereo grade stuff being used in the middle of an install of pro gear. [/QUOTE]

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