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Turn-on thump sound

Discussion in 'Pro Audio Equipment' started by carlw, Nov 21, 2009.

  1. carlw

    carlw Active Member

    Hi guys, let me quickly explain the situation:
    I have my drums triggered and I want to be able to switch the triggers on with one flick of a switch. This would include the Behringer Eurolive B215A P.A.

    So I bought just a cheap surge protected power board with an on/off switch and I tried plugging it all in here and switching it on (whilst the P.A's power switch was on already). This causes a bit of a thump sound - not as loud as if the P.A is on and you connect something to it and then power that on......but still fairly loud I guess.

    Is this really bad for it? I'd really like to avoid powering up everything separately because I've been doing that for the last few years and the power switch on the PA is awkward to get to.

    thank you.
  2. moonbaby

    moonbaby Mmmmmm Well-Known Member

    It is NEVER a good thing to power up gear that's connected to a power amp and speakers while the amp is on. That "thump" you hear is a type of DC voltage that can, and eventually will, damage your speaker components. Always power up everything else BEFORE you power up the amplification. Don't be lazy, it can cost you dearly.
  3. BobRogers

    BobRogers Well-Known Member

    What he said. Buy the power cables necessary to make sure the switch to the power amp is easy to get to and put a "Last on, first off" sign on it.
  4. carlw

    carlw Active Member

    OK thanks guys.
    I've rearranged things so I can easily reach the P.A. power switch and therefore turn it on last and off first.

    Honestly I didn't think it would be much of a worry but I've headed your warning and it's all sorted now.

    Thanks again.
  5. djmukilteo

    djmukilteo Well-Known Member

    They make sequential power strips that will turn equipment on in stages....
  6. carlw

    carlw Active Member

    Oh, interesting idea.
    But I think I'll just leave it how it is now.

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