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<blockquote data-quote="Greg Cameron" data-source="post: 26442" data-attributes="member: 42">Re: Ebtech HumX&nbsp;By definition, you cannot have an ac ground loop when there is only one connected ground. Two or more ground paths are required for a ground loop to occur, hence the term &quot;loop&quot;. One cannot have a loop if there&#039;s a break/missing piece in the loop <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink&nbsp; &nbsp; ;)"&nbsp; data-smilie="2"data-shortname=";)" /> It is telling though that you are getting noise in the amp when nothing but power is plugged in. I would start looking for an ac wiring fault like a ground/neutral swap. These can&#039;t be found with an outlet tester, it requires physical inspection since neutral and ground are (supposed to be) bonded at the service entrance. It also possible that they&#039;re bonded in more than one place at sub panels (unfortunately).It&#039;s also possible there&#039;s a fault in the amp where some current is getting shunted to ground and causing noise. You&#039;re not using any kind of MOV based surge protector strips are you? Make sure those are all out of the chain, Furman or similar devices included.Greg</blockquote>

[QUOTE="Greg Cameron, post: 26442, member: 42"] Re: Ebtech HumX By definition, you cannot have an ac ground loop when there is only one connected ground. Two or more ground paths are required for a ground loop to occur, hence the term "loop". One cannot have a loop if there's a break/missing piece in the loop ;) It is telling though that you are getting noise in the amp when nothing but power is plugged in. I would start looking for an ac wiring fault like a ground/neutral swap. These can't be found with an outlet tester, it requires physical inspection since neutral and ground are (supposed to be) bonded at the service entrance. It also possible that they're bonded in more than one place at sub panels (unfortunately). It's also possible there's a fault in the amp where some current is getting shunted to ground and causing noise. You're not using any kind of MOV based surge protector strips are you? Make sure those are all out of the chain, Furman or similar devices included. Greg [/QUOTE]

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