Ground loop(?) hum

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Hi All,

On our second Q acoustic 3060.
The first was brand new and when plugged in to a socket and with the crossover set to 80 and the volume about half, it hummed audibly in a quiet room. Turning up the volume or crossover increased the issue.

This is without it being connected to an amp and when connected to various sockets & extensions in our living room (tried with and without other things plugged in)

We asked richer sounds to replace it and have been using our ancient Gale sub which...

Ground loop(?) hum


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