Phantom Power

Discussion in 'Recording Gear and Equipment [BG]' started by davepack, Sep 29, 2004.

  1. davepack

    davepack Supporting Member

    Jun 16, 2004
    Denver, CO
    Some boards only supply phantom power to ALL inputs. My question is, how does this effect mics that are running into the board that don't need phantom power? Do they still operate properly? Will the phantom power harm them?
  2. The only safe way to know is ask the manufacturer of the mic. A lot of amps will not tolerate phantom power to the XLR output. Always a good idea to check out the manual before you fry something.

  3. Aaron Saunders

    Aaron Saunders

    Apr 27, 2002
    Haven't had a problem with SM58, SM57, or Sennheiser flatface guitar mics with phantom power on.
  4. nonsqtr

    nonsqtr The emperor has no clothes!

    Aug 29, 2003
    Burbank CA USA
    Mics will work fine. It's the "other" stuff you have to worry about. Anything that's plugged into the board that's "not" a mic. Like, a drum machine. Or an effects unit. Or even an active DI. As a general rule, anything with a transformer output will work fine with phantom power. But, I'd be careful with anything that has a solid state output (and that would include the "direct" outputs or "line" outputs from most bass amps). Note that the TRS ins usually don't carry phantom power (only the XLR ins usually do), so you might read the manual for your board to determine whether this is the case. You can isolate any input from the board using a 1:1 line transformer (check the schematics and white papers section at for some simple solutions).
  5. wwittman


    Apr 21, 2004
    Westchester, NY
    The problems occur if phantom is not wired correctly or in those situations where there is a mic level patch point; creating the possibility of a patch being inserted half way and shorting phantom...
    In these situations, damage could occur, to ribbon mics in particular.

    But phantom won't hurt any mic as long as the phantom is wired correctly.