Sub hum (only plugged into power outlet)

Discussion in 'Archived Threads 2001-2004' started by Jay Sylvester, Oct 15, 2002.

  1. Jay Sylvester

    Jay Sylvester Supporting Actor

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    Just got a new sub (M&K MX-150THX) and it's humming. I unplugged the RCA cable and it still hums when only plugged into the power outlet. Tried plugging it into different outlets around the room without the RCA cable attached and am still getting the hum. I plugged in my old Polk sub and it produces no hum. From the threads I've read using the search function, it doesn't sound like a grounding problem, but I admit that I'm clueless about the whole thing.

    Any suggestions? Is my new sub whacked or what?
     
  2. Jay Sylvester

    Jay Sylvester Supporting Actor

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    Nevermind. Because of my speaker setup, I had the phase switch on the sub set to negative. For whatever reason, on negative it generates a hum, but on positive it doesn't. I set it to positive, and then used the speaker setup on my AVM 20 to change the phase to negative rather than use the switch on the sub. No hum with this setup. Problem solved [​IMG]
     

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