Can phantom power sent in error damage pedals or bass? Electical hazard

Discussion in 'Miscellaneous [BG]' started by CR1988, Jun 7, 2019.

  1. CR1988


    Jun 7, 2019
    I recently acquired a Tech21Bass fly rig to use in my job in a cover band. I had previously just gone into a D.I box powered by phantom from an Allen & Heath desk through an xlr. The first few gigs I reminded the engineer about turning the phantom off as I was powering the tech 21 via plug. However as we revisit multiple venues regularly, each mix scene is saved for each venue, which meant that the phantom has been on in various venues since unknowingly, as I didnt have the foresight to repeatedly remove the phantom each time the old scenes were loaded up. Having had problems one gig recently I could feel a little electric coming from the end of the XLR going into the rig, and knew the phantom was on. Once it was turned off and the XLR was changed (just incase it was faulty also) the mic I was using for singing began to shock me and when i touched it with the back of my fingers there was a loud pop and further shock. This only happened once the phantom was turned off on the channel going into the tech21 rig.
    As a complete novice when it comes to anything in the field of electrical engineering Im not sure if the phantom being on while the rig was already powered by plug has caused any damage to the rig or the bass, and why this has led to my mic becoming loaded with live electicity. Im aware how dangerous this is though and am quite freaked out about the potential for electrocution. There is a 'pad' on the rig itself but I havent tried using it to see if it will make any difference, though when the pad is on the volume lowers significantly. Please excuse my lack of knowledge and naivety in this field. Anything that can help inform and educate me on this would be greatly appreciated.
  2. Roland GR 88

    Roland GR 88 Commercial User

    Sep 16, 2013
    Ontario Canada
    Retail store manager
    Phantom power won't hurt or affect your microphone in any way. Assuming it's a simple SM58 or similar. It just won't "see' it. The current you felt has nothing to do with it. There were other factors at play. Your Fly Rig however will say in the manual if it's safe (unlikely) and if there's no mention of it assume that it is not. I would use a D.I. with your Fly Rig and not the built-in one to isolate it from potential damage as you're playing different venues and relying on an often unknown board and operators. The pad is only there to cut 10-15db from from an active bass if the signal is overloading the pre-amp.
    .......and welcome to T.B. :) Good luck.
  3. CR1988


    Jun 7, 2019
  4. If your Fly Rig is still working correctly, the phantom power didn’t hurt it. Getting zapped means your stage power and the mixer power are on 2 different circuits and something isn’t wired correctly. I’d start with one of those plug testers with the 3 lights and check all the electrical plugs. Your old DI being phantom powered kept you from getting shocked because it was the same electrical circuit as the mixer (because the power comes from the mixer).