Isolation transformers will 100% work, but getting good quality may be expensive.
Are you sure the ground loop occurs when ONLY your preamp and amps are physically connected? Including the speakers, of course. :)
Experience with Inline Ground Loop Eliminators?
Audio Enthusiasts -
I am running an LTA level 2 preamp to an AGD Audion MKiii mono blocks. I've diagnosed that I have a ground loop between the two units.
ChatGPT is recommending a passive isolation transformer that will go in-line with each RCA signal, breaking the ground loop via transformer coupling. Some of the recommended solutions are the Hall GLI-RCA Stereo Ground Loop Isolator, Recoil MGL14/GLIRCA and Sescom IL-Stereo-19 Pro Audio Hum Eliminator.
I was wondering if anyone has used any of these devices? Or have any recommended other solutions based on your experience?
Thanks in advance!
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@cleeds - I have the LTA preamp and AGD monoblocks both connected to a Puritan 156, so they are both on the same AC line.
@erik_squires - I followed a series of diagnostic steps from ChatGPT. When I disconnected the RCA cables between the LTA and AGD units, the hum went away through the speakers. According to ChatGPT, it’s probably a ground loop issue between those components. Jensen seems to be the recommended manufacturer for this type of problem. Again, according to ChatGPT… |
@bluethinker So if I'm understanding your question and explanation correctly your preamp and monoblocks are plugged into two different outlets on two different circuit breakers? |
If the amp and preamp are on the same line, then the origin of the ground loop is elsewhere - such as a source component connected to another AC line or ground. The preamp then sees the source ground potential through the interconnect. To troubleshoot, you can disconnect your sources one at a time to test if the hum goes away.
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- 13 posts total