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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Standards Catalogue

Already Subscribed to this document. Phantom power is sometimes used by workers in avionics to describe the DC bias voltage used to power aviation microphones, which use a lower voltage than professional audio microphones. You may have also heard warnings that phantom power can damage some mics.

What is this phantom power and why is it necessary? One such approach is known as bias power—also called plug-in-power. This standard is also available to be included in Standards Subscriptions.

RDL STMPA48 – Dual Microphone Phantom Adapter – 48 V – Herman ProAV

This document provides support for the currently recommended characteristics of analog multimedia interfaces to achieve compatibility between devices from different manufacturers. 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 an acoustic guitar preamp. However, they can also be powered lec an onboard battery or an exterior power supply like with the Mojave Audio MA However, the difference is usually obvious from the connectors: Phantom powering was used in telephone systems since the introduction of the rotary-dial telephone in before it was applied to condenser microphones.


Although 12 and 48 volt systems are still in use, the standard recommends 24 volt supply for new systems. Bias power uses a two-wire system, unlike the XLR 3-wire system supported by most mixers. Phantom powering can cause equipment malfunction or even damage if used with cables or adapters that connect one side of the input to ground, or if certain equipment other than microphones is connected to it.

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. Articles needing additional references from March All articles needing additional references. A Capacitor is used to block the DC from subsequent audio frequency circuits.

As a result, you may encounter gear that supports any of these voltages.

Adapter barrels, and dedicated power supplies, are made to accommodate T powered microphones. In other projects Wikimedia Commons.

Phantom powering consists of a phantom circuit where direct current is applied equally through the two signal lines of a balanced audio connector in modern equipment, both pins 2 and 3 of an XLR connector. Unsourced material may be challenged and removed.

Phantom power should be assigned to only the channels that need it. Some condenser microphones can be powered with a 1. 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 661938 off, also this can be done in groups in most mid-range boards and some smaller ones.


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For other uses, see Phantom Power disambiguation. Digital interface handbook third edition. Sending Phantom Power to an old prior to design ribbon microphone without an isolating transformer, while using a bad cable, which has the ground pin 1 shorted to pin 2 or pin 3 of the XLR.

In most cases, these different levels irc not cause concern. Phantom power is the right amount of power where needed. You may delete a document from your Alert Profile at any time.

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To use 619388 requiring it with these amplifiers, a separate power supply must be inserted into the line. Although it is safe to plug a dynamic mic into an input that provides phantom power, plugging in other electronic devices—a keyboard or an effects pedal that has an XLR out, for example—is less certain.

A frequent source of confusion for guitarists is that some microphones use different powering schemes. These are readily available commercially, or alternatively are one of the easier projects for iev amateur electronics constructor.

Many older Sennheiser and Schoeps microphones use this powering method, although newer recorders and mixers are phasing out this option. Phantom power involves a clever scheme that leverages isc multiple wires in a typical balanced-XLR cable to provide voltage to mics that need it without affecting those that do not.