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A few comments

I am pretty much flying blind, here.

If you are trying to connect headphones to the monos speaker jacks, the hum may be coming from the amplifiers and not a ground loop and/or aggravated by high gain in your system and sensitive headphones. If so, this can be solved to some degree by a resistive headphone adaptor (attenuator), connected to the speaker outputs of the amp(s) and/or different headphones.

Are you sure that the rca connectors in your system are properly grounded and have good solder joints.

A fair amount of the time, ground loops come from having different components attached to different AC outlets, a problem solved by a mains distributor that has enough sockets to connect all of your equipment.

Are the grounds you connected extra?

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Follow Ups Full Thread
Follow Ups
  • A few comments - Frihed89 05:24:22 01/12/17 (1)
    • amp hum - walkstoslow 12:52:36 01/13/17 (0)


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