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Audio troubleshooting

Discussion in 'Audio' started by HighTekRedNeck, Jun 21, 2017.

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  1. HighTekRedNeck

    HighTekRedNeck

    3
    0
    Jun 21, 2017
    Hello,
    I'm obviously a noob here, but I enjoy fixing almost anything.
    I have an active speaker with high end hum. I know , because I've isolated the noise to my inputs on my circuit board. I cannot find any obvious bad joints or capacitors.
    The mfgr doesn't make or sell boards for this model. RS415 (Gemini)
    I'd rather not trash the whole thing or start randomly replacing Capacitors yet.
    Thanks for the help!
     

    Attached Files:

  2. duke37

    duke37

    5,301
    740
    Jan 9, 2011
    What is high end hum?
    If it is mains frequency hum, then the reservoir capacitors (the big ones) have probably "gone off".
    You can test this by putting a good capacitor in parallel with an existing capacitor, If there is an improvement, then replace the old capacitor.

    Can you get a schematic?
     
  3. HighTekRedNeck

    HighTekRedNeck

    3
    0
    Jun 21, 2017
    Thanks for the reply. The hum is only from the tweeter. Goes away when I unplug the tweeter. Yes I have a schematic.
     
  4. shrtrnd

    shrtrnd

    3,701
    462
    Jan 15, 2010
    I'd check the grounding. Any grounds to the speaker housing, or possible short inside the tweeter?
     
  5. HighTekRedNeck

    HighTekRedNeck

    3
    0
    Jun 21, 2017
    Good points. I forgot to mention I did have a ground junction to the heat sink that had continuity. The tweeter is new since I blew the last one.
     
  6. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    Remove the leads to the tweeter and check if there is any dc volts as this will damage it.
     
  7. Audioguru

    Audioguru

    2,742
    619
    Sep 24, 2016
    Hum is a low frequency. Buzz is a higher frequency and hiss is a very high frequency. A tweeter does not produce low frequency hum.
     
  8. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    High tek red neck..

    Do you have a scope to check the circuit out.

    Also just replacing parts here and there will waste time.
     
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