Question about Monster Cable MPA3250SS 3-Channel Amplifier

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Monster Amplifier MPA 3250

I bought a Monster mpa 3250 in 2004 and it has worked fine until recently. I had a tech out from Ultimate Electronic and we discovered a hum when the speakers were hooked up. He said it was a ground issue inside the amp and to send it back to Monster. I weighs 100+ lbs. and I would have to ship it from Las Vegas to Virginia for analysis. Any ideas on what I could do myself? I am not electronics savy but have friends who are. Thanks.

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  • rrogers1958 Jul 17, 2008

    1) I do not believe the hum was there when the inputs were disconnected.

    2) The hum did get a bit louder with volume increase but not proportional.

    3) These amp (I have another one also) have always run hot so I don't know if it is hotter than normal.

    4) It is on both channels

    5) Just noticed when the tech was out. It could have been there since the first installation.

    6) It is out of warranty

    Thanks for your help.



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Hi rrogers1958

Not to discount what your tech has already said, there are a few things that can cause hum. Just want to get info direct from you regarding this problem. Then, I can attempt to point you in the right direction if you can provide me with answers of a few questions

  1. is the hum still there when you disconnect the inputs
  2. does the hum increase in vol when you turn up the preamp
  3. does the amp run hotter than normal
  4. is the problem on both channels
  5. did any event or contributing factor induce the hum or did it just start out of the blue
  6. do you have any warranty on the amp
If you could answer these questions for me, then I will convey what I think to you. Cheers


Posted on Jul 17, 2008

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Turn off the led on the front that should take care of the hum.

Posted on Oct 26, 2008


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