IEC 61938 PDF

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 Edition INTERNATIONAL. STANDARD. NORME. INTERNATIONALE. Multimedia systems – Guide to the recommended characteristics. IEC Multimedia systems – Guide to the recommended characteristics of analogue interfaces to achieve interoperability.

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

There must always be a DC current path between pin 1 of the microphone and the negative side of the 48 volt supply, if power is to reach the microphone’s electronics. Has phantom power damaged this keyboard? The following table provides a basic starting point for several instruments. One popular acoustic preamp even provides just 619938 volts.

The first known commercially available phantom-powered microphone was the Schoeps model CMT 20, which came out inbuilt to the specifications of French radio with 9—12 volt DC phantom power; the positive pole of this powering was grounded. Use only one microphone to pick up a single sound source. As a guitarist, you may also encounter some less common scenarios related to phantom power. The IEC Standard defines volt, volt, and volt phantom powering.

A keyed variation of the usual XLR connectorthe XLD connectormay be used to prevent accidental interchange of analog and digital devices.

PG Alta Microphones

A good guitar tech can clear up any confusion and help you set up such a system correctly. 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.

If there is a fault in the cable, phantom power may damage some mics by applying a voltage across the output of the microphone. Norwegian Radio had requested phantom-powered operation. Drums feet m Place in front of the drum kit to capture more of the kick 61983, or as an overhead above the kit, 6198 down to capture more cymbals.


Most mics require only a few milliamps of current, which any modern mixer should easily support, but some mics—as well as phantom powered preamps—may have higher current demands. It is often used for powering electret microphoneswhich will not function without power. Most mics work fine over the voltage range of volts, although many mic manufacturers specify 48 volts for best performance, and some mics may be more problematic than others when encountering lower levels of phantom power—you may notice some loss of output or sensitivity with lower voltages.

Place near the sound hole for a full sound, or near the 12th fret for a balanced, natural sound.

The mics are similar—a mic with an XLR connector expects phantom power, a mic with two wires, or a simple non-XLR connector, probably expects bias power. In most cases, these different levels should not cause concern.

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.

Suitable for live and studio applications, PG Alta microphones are built to last, and meet the same rigorous quality testing standards that 61983 all Shure products trustworthy and reliable. However, the difference is usually obvious from the connectors: Phantom power is provided by the mixer or audio interface that the microphone is connected to, and requires the use of a balanced microphone cable: Add a windscreen when using the 619388 outdoors.

Set up the microphones with the capsules close together, but not touching.

Phantom power involves a clever scheme that leverages the multiple wires in a typical balanced-XLR cable to provide voltage to mics that need it without affecting those that do not.


One complication with phantom power is that there are multiple standards for voltage ifc.

Learn more about the cookies we use and how to change your settings. Auxiliary percussion congas, tambourine, etc. It is suitable only for powering microphones specifically designed for use with this type irc power supply. For other uses, see Phantom Power disambiguation. Check your instruction manual to be sure that the device is safe for phantom power, and assume that it is not safe if the manual is silent about the issue.

Both plug-in-power and soundcard power are defined in the second edition of IEC 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. Shure offers additional educational publications on microphone placement and recording techniques.

Search all products by. Experiment with angles between 90 and degrees to capture the full width of the source. This article needs additional citations for verification.

Directional microphones progressively boost bass frequencies as the microphone is placed in closer 61398 to the source. Sound for Film and Television. The X-Y technique provides excellent phase coherency because sound arrives simultaneously at both microphones. Views Read Edit View history. Guide to the recommended characteristics of analogue interfaces to achieve interoperability GMT.

Most modern mixers provide 48 volts, which has become so common that many people assume that phantom power automatically means 48 volts. Adapter barrels, and dedicated power supplies, are made to accommodate T powered microphones.