What is Phantom Power & Why Do I Need It?

Phantom power, sounds funny, doesn’t it? If you’re new to home recording, this term can be confusing. Thankfully, we can help…

Shure Beta 181

Phantom Power is a term given to the process of delivering DC (Direct Current) to microphones requiring electric power to drive active circuitry. Condenser microphones such as Shure’s KSM range all have active circuitry and require phantom power.

How Does Phantom Power Work?

The power can be provided by a battery located inside of the mic; an example is the Shure PG81 (now discontinued) that operates from a single AA battery. Alternatively (and most commonly) the DC power is provided by the pre-amp/mixer and delivered to the condenser microphone via the mic cable. This method is referred to as phantom power. The worldwide standard for phantom power is 11 to 52 volts of DC (typical studio mics run on 48v). Your preamp will typically have a button labelled 48v, which allows you to turn this on/off. However, some older mixers and cheaper audio interfaces may not have phantom power. In this case, an external phantom power supply can be added between the condenser mic and the preamp.

Will Phantom Power Damage My Dynamic Mics?

A dynamic microphone, like the SM58, does not require phantom power because it does not have active electronics inside. Nonetheless, applying phantom power will not damage other microphones in the vast majority of cases. The reason is that modern dynamic  microphones are designed to accept phantom power without issues, but we advise checking your manual or consulting with the manufacturer first before connecting; particularly if you have a ribbon microphone.

Additionally, it’s a good idea to turn phantom power off while plugging and unplugging microphones to prevent any potential power surge and general pops and loud noises, which could damage your speakers/headphones over time .

Why Is It Called Phantom Power?

Condenser microphones made in the 1930s, 1940s, and 1950s required a special power supply to operate. This power supply would often be located quite near the microphone and was usually large, heavy, and cumbersome. In the 1960s, work began on a new powering concept that would eliminate the need for a separate power supply.

Schoeps and Neumann (German microphone manufacturers) were leaders in this development. Eventually, a new condenser mic powering standard emerged. The DC power to operate the condenser mic was provided by the mixing board and delivered via the mic cable; eliminating the need for an external power supply. And what does one call a power supply that is working, but invisible? It is a phantom power supply! – Source Shure Inc Applications Engineering 

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Marc Henshall

Marc forms part of our Pro Audio team at Shure UK and specialises in Digital Marketing. He also holds a BSc First Class Hons Degree in Music Technology. When not at work he enjoys playing the guitar, producing music, and dabbling in DIY (preferably with a good craft beer or two).

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  • Bill Brown says:

    Our church uses two AKG Preception 170 at the chanter’s stand. The manual says the mic needs 48±4VDC per DIN STD 45596. Your article says the DIN allows 12-52VDC, but “studio mics run on 48V.” Our BOGEN GS-60 AMP supplies 13.2VDC phantom power. My question is whether this lower voltage has an effect on the sensitivity of the mic. (I realize the 170 is not a Shure; we do use Shure SM58’s too in our PA system.)

  • terence grant says:

    So I don’t need to activate Phantom-power on my mixer if I am using a wireless system which operates on batteries?

    • shureUK says:

      Hi Terence, thanks for your question. You don’t need phantom power with wireless mics. Equally, activating it won’t do any harm to your system. Phantom power is used to send a small amount of power back through the XLR cable to power condenser microphones and other devices that require such power – for example, some active DI’s will accept phantom power. I hope this helps.

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