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Phantom Power

Discussion in 'Sound, Music, and Intercom' started by Eboy87, Jun 20, 2004.

  1. Eboy87

    Eboy87 Well-Known Member

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    I've been using 12V phantom mics plugged into a mixer with phantom power on(duh). However, I also am using a dynamic mic to mic a guitar. Is it a good idea to plug it into the same mixer as the phantom mics?
     
  2. mbenonis

    mbenonis Wireless Guy Administrator Premium Member

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    It shouldn't make a difference. I use SM58's with phantom power all the time.
     
  3. Eboy87

    Eboy87 Well-Known Member

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    That's what I thought. I'd been using this arrangement for some time, but one day the dynamic mic wouldn't work and I tried everything I knew to fix it, but to no avail. I thought that phantom power was the culprit.
     
  4. PATech

    PATech Member

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    I'm assuming that your mixer has one global phantom power switch. I've heard some argument over whether phanton power effects the sound quality of dynamic mics, but I haven't noticed any difference. A dynamic mic should work 100 percent with phantom power running on its line. There shouldn't be any issue. I hope that helps.
     
  5. DMXtools

    DMXtools Active Member

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    Under normal circumstances, phantom power won't hurt a dynamic mic. 12 volt phantom power is unusual in pro boards, by the way; 48 volts is standard. I've been using an assortment of dynamic mics on a 48-volt phantom-power board, some of them for over 10 years, with no problems. 12 volts should be less likely to cause problems. The only phantom power problem I've had was when I had to use a 12-volt board - some of my condensers absolutely need 48 volts and won't work on 12.

    John
     
  6. Eboy87

    Eboy87 Well-Known Member

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    The mixer I'm using is a Carvin studio mixer (I know, it does suck). I'm prettey sure it is 12v. The phantom mics are made by either crown or sure. I don't remember off the top of my head. I'll find out.
     
  7. The_Guest

    The_Guest Senior Team Emeritus Premium Member

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    Larger mixers did not have global phantom power its selectable for each channel. Some DI's and special mics can get damaged from phantom power. I believe one the SWR bass head's DI can fry out when phantom power is active on that channel.
     
  8. MikeJM

    MikeJM Member

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    Phanton Power

    It is nice to have phantom power selectable on every channel rather than a global phantom power switch on a console. Even if I know that the extra power wont damage the perticular mics I am using, it is always nice to have that control. On smaller consoles it is more rare to see this option, but I do know, that the new Mackie Onyx has this feature, when the previous smaller mackies don't. You can also sometimes buy battery packs to use instead of using phantom power. I know the Audio Technica At853a and the Shure Beta91 can both be purchased with battery packs, and use just a simple 9V battery. I used the battery packs with the Shure Beta91's in 6th grade in additon to phantom power, that was because I had no idea what phantom power was, it just sounded good.

    Cheers,
    Mike M
     
  9. The_Guest

    The_Guest Senior Team Emeritus Premium Member

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    Or you could just buy a phantom power supply, why spend the money on all the batteries.
     
  10. dvsDave

    dvsDave Benevolent Dictator Administrator Senior Team CB Mods Fight Leukemia

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    Our church just got a brand new Allen & Heath PA28... it's gorgeous... It's the first time we've had phantom power per channel, instead of global. I was up on stage playing bass and they couldn't get a signal from my Behringer DI100 (which is an active DI box powered by phantom power)

    So, after the song ended, they asked me if I was correctly plugged in. Realizing the issue, I asked them if my channel had phantom power on, they then hit the phantom power button without muting the channel and all the sudden my bass could have been heard in the next county. So, lesson to take away: if you have per channel phantom power, mute or fade the channel down before switching it on or off.
     
  11. DMXtools

    DMXtools Active Member

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    And, unfortunately, my "live sound" mixer only has global phantom power. However, it has both XLR and TRS inputs on each channel, with phantom power only on the XLRs. I carry a handful of XLR/TRS adapters for this and similar situations.

    John
     
  12. foreverlearning

    foreverlearning Member

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    I'm new here and don't know how long anyone monitors this, but I was wondering if phantom power can effect the integrity of cables
     
  13. mbenonis

    mbenonis Wireless Guy Administrator Premium Member

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    Phantom Power should have absolutely no effect on the integrity of any cables whatsoever.
     
  14. avkid

    avkid Not a New User Fight Leukemia

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    unless of course you use cables with loose or frayed wires(obviously)
     
  15. mbenonis

    mbenonis Wireless Guy Administrator Premium Member

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    That would be a sign you need new XLR...desperately!
     
  16. The_Guest

    The_Guest Senior Team Emeritus Premium Member

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    Where do you get this all from?
     
  17. spiwak2005

    spiwak2005 Member

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    Some CAN be damaged

    Yeah it's best to go with the TRS Insert if it's available to you on the dynamics. Electrovoice swears their RE20's can't be damaged by phantom power, but if you listen closely there seems to be a little added noise when run through the powered XLR connect. Then again, it all depends on the board. Just be cautious when you're using the really expensive mics!
     
  18. avkid

    avkid Not a New User Fight Leukemia

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    the theory that all power, be it 110 or 12v will shock you if bad wires are used.
     
  19. tjbaudio

    tjbaudio Member

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    Phantom power is basicly a + DC voltage present on both pins 2 and 3 with the negative on pin 1. Balanced mice lines are signal on 2 and 3 with ground on pin 1. The equal voltage on 2 and 3 cancel each other out when a balanced dynamic mic is pluged in. There are some old mics and some new really cheep ones around that are unbalaced dynamic and the phantom will fry them (think speaker with DC on it, same thing in the mic but smaller.) The other thing that can be damaged by phantom power is an active out put with a blocking cap with too low of rating. There are some shure WLS units out there with only 30V caps in them that will be damaged by 48V phantom. I suspect some keyboards and bass amps are the same way.
    TJB
     
  20. jonhirsh

    jonhirsh Active Member

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    your only phantom power issue is . if you use a ribbon mic generaly used for recording but i know people who use them as overheads for drums insted of cardiods, you will give it far to much power it will completly destroy the mic and ribbon mics are in the $1500.00 and up range so you dont want to pooch one of those. but other wise there is absolutely nothing that phantom power can harm it doesnt matter what you have pluged in aslong as its not a ribbon mic. but if you are a school or a church witha a low budget why would you use extra power when its not necesary leave it off untill you are needing it.

    Jon Hirsh
    Black Horse Productions
    [email protected]
     

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