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  • Phantom power

    My drummer runs both dynamic and condenser mics. The board he's using has phantom power but no on/off for each individual channel. I looked on the Shure website and it stated:

    "A balanced dynamic microphone is not affected by phantom power. However, an unbalanced dynamic microphone will be affected. Although the microphone will probably not be damaged, it will not work properly."

    Does this mean if it's low impedence XLR that it won't be affected? Are there any other guidelines to prevent any problems/damage to equipment?

  • #2
    Yes, low impedance dynamic mics are not hurt by phantom power.

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    • #3
      Phantom should be over the XLR inputs only, so if you use the TRS inputs (if app), there *shouldnt* be +48v. But check the manual.

      Another tip is to A) not gender bend into the XLR input unless you are sure its done properly or B) the equipment can handle +48v

      Also make sure the outputs are turned down when plugging into/out of the jacks with phantom power on

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      • #4
        If it's all microphones or DI boxes with XLR cables, no problem.

        If you have a special cable to plug in your iPod (or whatever) to XLR inputs then you might have a problem.
        "I would kill the children of a thousand planets, just to see you smile"

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        • #5
          When using phantom power on all inputs make sure there are no 1/4 (other stuff output) to XLR (board side) cables. Common things would be keyboards, wireless mic recievers (1/4 outputs, many newer XLR outputs can handle +48v), effects processors etc.
          www.rock-bot.com
          Live-Band-Karaoke

          bassist and sound reinforcement

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          • #6
            In particular the XLR line outs from certain bass amps are known to respond to phantom power by blowing out. When I use a line out from a keyboard or bass amp I always use an XLR to TRS cable at the mixer to use the mixer's line inputs. I've never seen a mixer that had phantom power on its line inputs.

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            • #7
              In particular the XLR line outs from certain bass amps are known to respond to phantom power by blowing out.


              Not our amps, they are all fully phantom power protected.
              -------------------------------------------------------------------------------------------------------------------------------------------------------------------
              Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

              Currently product development engineer: Mesa Boogie

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              • #8
                Not our amps, they are all fully phantom power protected.


                yeah but see what happends when you push 48 volts of direct current into a powered speaker

                generally as long as you dont have anything adapted to go into the xlr connectors you should be fine...IE a cd player with RCA-XLR adapters on it.

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                • #9
                  yeah but see what happends when you push 48 volts of direct current into a powered speaker

                  If it is phantom power, it would be sourced by the receiving device which would be the powered speaker itself. Some have phantom power available on their INPUTS when the mic switch is selected. In this case, the device DRIVING the powered speaker needs to be phantom power protected.

                  You need to learn about how these devices work if you are going to make such comments.
                  -------------------------------------------------------------------------------------------------------------------------------------------------------------------
                  Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

                  Currently product development engineer: Mesa Boogie

                  Comment


                  • #10
                    yeah but see what happends when you push 48 volts of direct current into a powered speaker

                    generally as long as you dont have anything adapted to go into the xlr connectors you should be fine...IE a cd player with RCA-XLR adapters on it.


                    phantom power applied to a speaker would hardly do anything due to current limiting. wouldnt even move the VC i bet.
                    band status - "its complicated"

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                    • #11
                      phantom power applied to a speaker would hardly do anything due to current limiting. wouldnt even move the VC i bet.


                      He mentioned powered speaker, the trick is to route phantom power from an input to an input!!!
                      -------------------------------------------------------------------------------------------------------------------------------------------------------------------
                      Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

                      Currently product development engineer: Mesa Boogie

                      Comment


                      • #12
                        No, i know how these devices work
                        I was setting up a gig where we used a mackie 24:4 connected to EON15s
                        well we had the phantom power on for the mics we were using, and by a problem with the console we found it also sending the 48 in the outputs
                        I was making a joke, this obviously wouldn't happen normally. im

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                        • #13
                          doesnt the inputs on powered speakers (assume balanced) have a transformer and would negate phantom?
                          band status - "its complicated"

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                          • #14
                            No, i know how these devices work
                            I was setting up a gig where we used a mackie 24:4 connected to EON15s
                            well we had the phantom power on for the mics we were using, and by a problem with the console we found it also sending the 48 in the outputs.


                            ****************ing impossible.
                            -------------------------------------------------------------------------------------------------------------------------------------------------------------------
                            Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

                            Currently product development engineer: Mesa Boogie

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