IEC 61938 PDF

IEC Standard | Audio, video and audiovisual systems – Interconnections and matching values – Preferred matching values of. However it might be better to be aware of such defects rather than oblivious of them. Parallel powering is covered by section of the. IEC standards. IEC Multimedia systems – Guide to the recommended characteristics of analogue interfaces to achieve interoperability.

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Views Read Edit View history. As a final warning, when your musicians use an in-ear monitoring system, make sure any required phantom is turned on before they put in their in-ears.

Image courtesy of Yamaha. Baggs ParaDI, for exampleand these may 619388 work with lower voltages.

The specific symptoms vary somewhat, but the most common result will be reduction of the maximum sound-pressure level that the microphone can handle without overload distortion. A Capacitor is used to block the DC from subsequent audio frequency circuits. Reference is made to IEC for the connection of digital signals. Many mixer boards have a switch for turning phantom power on or off; in most high-end equipment this can be done individually by channel, or on smaller mixers all mic channels can be either on or off, also this can be done in groups in most mid-range boards and some smaller ones.

Church Sound: The Basics Of Phantom Power – ProSoundWeb

These alternative powering schemes are sometimes improperly referred to as “phantom power” and should not be confused with true volt phantom powering described above. Some circuits also have significant additional resistance in series with the standard pair of supply resistors for each microphone input; this may not affect low-current microphones much, but 6138 can disable 619338 that need more current. There is often no audible difference between microphones featuring this method and microphones with P48 powering.


What is this phantom power and why is it necessary? This is not the same as phantom power which sends power down two lines.

Instrument amplifiers rarely provide phantom power. If there is a fault in the cable, phantom power may damage some mics by applying a voltage across the output of the microphone. T-power, also known as A-B powering [14] or T12, described in DINis an alternative to phantom powering that is still widely used in the world of production film sound. This results in a 12 volt potential isc with significant current capability across pins 2 and 3, which would likely cause permanent damage if applied to a dynamic or ribbon microphone.

P12, P24 and P This is in contrast to microphones with vacuum-tube circuitry, most of which require special, multi-conductor cables.

With phantom power, the supply voltage is effectively invisible to balanced microphones that do not use it, which includes most dynamic microphones.

Other microphones are specifically designed to switch over to the internal batteries if an external supply fails, which may be useful. March Learn how and when to remove this template message. When in doubt, consult your instruction manual or get in touch with the manufacturer. The volt version of phantom powering, proposed quite a few years after the 12 and 48 V 6138, was also included in the DIN standard and is in the IEC standard, but it was never widely adopted by equipment 619388.


If the document is revised or amended, you will be notified by email. Acoustic guitarists often encounter bias-powered mics as part of dual-source pickup systems. As a side note, mixers will provide phantom power at 48 volts but the ANSI standard IEC allows for 12, 24, and 48 volts which other equipment might provide, such as with irc acoustic guitar preamp. This ied was last edited on 13 Novemberat This standard is not included in any packages.

If its required current is not available, a microphone may still put out a signal, but it cannot deliver its intended level of performance. When phantom powering was introduced, one of its advantages was that the same type of balanced, shielded microphone cable that studios were already using for dynamic microphones could be used for condenser microphones.

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Has phantom power damaged this keyboard?

RDL Dual Microphone Phantom Adapter – 48 V

Although 12 V and 6198 V systems are still in use, 24 V systems are preferred for new developments. Unsourced material may be challenged and removed. This is particularly a problem with long microphone cables.

Most ground lift switches have the unwanted effect of disconnecting phantom power. When sound hits the capsule, the variation between the space produces an electrical signal which represents the sound detected.