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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Sound for Film and Television. Please first log in with a verified email before subscribing to alerts. Most modern mixers provide 48 volts, which has become so common that many people assume that phantom power automatically means 48 volts.

ieec It is also defined in IEC When in doubt, consult your instruction manual or get in touch with the manufacturer. 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 page was last edited on 13 Novemberat Phantom power is a method of sending DC voltage 48V from a mixer, through a balanced cable, to a condenser microphone.

Image courtesy of Yamaha. Lifting the ground, which is normally pin 1, breaks this path and disables the phantom power supply.

Church Sound: The Basics Of Phantom Power

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. Many mixers and recorders intended for that market have a T-power option. Norwegian Radio had requested phantom-powered operation.

Adapter barrels, and dedicated power supplies, are made to accommodate T powered microphones. Stay up-to-date, get the latest pro audio news, products and resources each month with Live Sound. If you do need to engage the phantom power, make sure they take their in-ears out because a loud pop can be 6138 in the system.


Imagine it as two-way traffic along the same road. If the document is revised or amended, you will be notified by email. The volt version of phantom powering, proposed quite a few years after the 12 and 48 V versions, was also included in the DIN standard and is in the IEC standard, but it was never widely adopted by equipment manufacturers.

At the very least, plugging in a mic while phantom power is active can cause a loud, audible pop from the speakers if the volume is up. The signal conductors are positive, both fed through resistors of equal value 6.

This standard is not included in any packages. This is in marked contrast to another, slightly earlier method of powering known as “parallel powering” or “T-powering” from the German term Tonaderspeisungin which DC was overlaid directly onto the signal in differential mode.

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Acoustic guitarists often iwc bias-powered mics as part of dual-source pickup systems. If you have an amp or preamp that ied power for a mic, an XLR-mic connector almost certainly indicates real phantom power. Please help improve this article by adding citations to reliable sources. P12, P24 and P These are readily available commercially, or alternatively are one of the easier projects for the amateur electronics constructor. These same cables will also be used to pass the audio back from the microphone.

Many mixer idc 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.

Standards Catalogue

This supply can furnish up to mA to digital microphones. Recommendations for interfaces for devices used in vehicles and for analog video interfaces for radio or similar devices are not provided. Several popular acoustic guitar amps provide 24 volts. However, they can also be powered by an onboard battery or an exterior power supply like with the Mojave Audio MA Phantom power is sometimes used by workers in avionics to describe the DC bias voltage used to ief aviation microphones, which use a lower voltage than professional audio microphones.


Mids and later condenser microphones designed for volt phantom powering often require much more current e. A frequent source of confusion for guitarists is that some microphones use different powering schemes. In addition, two additional variants P12L and SP48 are mentioned for specialized applications. Microphone preamplifiers of the Nagra IV-series tape recorders offered this type of powering as an option for many years and Schoeps continued to support “negative phantom” until the CMT series was discontinued in the mids, but it is obsolete now.

Eic the phantom power on? Although 12 V and 48 V systems are still in use, 24 V systems are preferred for new developments.

Phantom Power | Radio Design Labs

In commercial dual-source systems with onboard electronics, such as the L. Views Read Edit View history. The good news is it will not damage dynamic microphones. One such approach is known as bias power—also called plug-in-power. In these cases, the mic can be powered by wiring it to the ring terminal of a stereo jack in the guitar, and then using a stereo guitar cable to plug into an acoustic guitar preamp that provides the bias power on the ring of the cable.

For unintentional voltages in power distribution systems, see stray voltage. 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.