Sienna Rhodes
Phantom power is a way of sending a DC electrical current through a balanced XLR cable to power a microphone and its internal amp. It is most commonly used with condenser microphones, which require external voltage to operate. Dynamic microphones, on the other hand, do not require phantom power. When it comes to sound cards, some computer sound cards with microphone jacks can provide plug-in-power (PiP), a low-voltage supply of 3-5V, which is distinct from phantom power. While sound cards can provide this low-voltage power, they do not typically provide the 48V of phantom power required by condenser microphones. To use a condenser microphone with a computer, a separate audio interface is usually required to provide phantom power.
| Characteristics | Values |
|---|---|
| Phantom power | 48V |
| Purpose | Powering microphones without using bulky external power supplies |
| Use cases | Used with condenser microphones |
| Not suitable for | Dynamic microphones |
| Alternatives | Plug-in-power (PiP), USB audio interface |
| Issues | Can damage microphones if used with cables or adapters that connect one side of the input to ground |
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What You'll Learn
Condenser microphones and sound cards
Condenser microphones are much more sensitive than dynamic microphones and generally provide better sound quality. However, they require an external voltage supply, also known as phantom power, which is traditionally provided through the microphone cable by the mixer or preamp. Dynamic microphones, on the other hand, do not require phantom power and can be plugged directly into the mic input of a PC.
Phantom power is a way of sending a DC electrical current through a balanced XLR cable to power the diaphragm and the mic's internal amp. It is most commonly used as a power source for condenser microphones, which have active electronics. True condenser microphones require a voltage to polarize the microphone's transducer element, and phantom power provides this voltage. Nearly all modern mixing consoles have a switch to turn phantom power on or off, and it can be blocked in any channel with a 1:1 isolation transformer or blocking capacitors.
If you want to use a condenser microphone with a computer, you will need an audio interface, preferably a USB one. This is because the mic input on a computer is designed for headset mics used for applications like Skype, and is not electrically compatible with a recording mic. Some USB interfaces that provide phantom power are relatively inexpensive and can offer better quality than using a separate phantom power source and the built-in audio interface of your computer.
It is important to note that plugging a condenser microphone into a 3.5mm jack on a laptop may not work due to insufficient voltage. A USB sound card adapter can be used to provide more voltage, but it is recommended to use an audio interface with an adjustable preamp for better results. Additionally, it is considered good practice to disable phantom power when not in use, as it can damage equipment if used with cables or adapters that connect one side of the input to ground.
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Plug-in-power and sound cards
Plug-in power, also known as PIP or bias power, is a method of providing power to microphones through the same cables that are used to transmit the audio signal. It is commonly used on consumer equipment such as portable recorders and computer sound cards. Plug-in power operates at a lower voltage than phantom power, usually 5 volts or less, and is typically used to power smaller devices such as lavalier microphones or in-ear monitors.
To use plug-in power, the device must be equipped with a plug-in power input, typically a 3.5mm TRS connector. This is the standard input found on most microphones requiring plug-in power. When plug-in power is applied, the device can draw the necessary power from the cables, eliminating the need for a separate power supply or batteries.
Plug-in power is particularly useful for powering electret microphones, which require power to function. However, it is important to note that plug-in power is only suitable for microphones specifically designed for use with this type of power supply. Using a microphone with the wrong power supply can result in damage to the equipment.
While plug-in power is a convenient way to power microphones, it does have some drawbacks. TRS connectors are not balanced, making them more susceptible to electrical noise or interference. Additionally, some devices, such as smartphones, do not supply any power at all, rendering microphones that solely rely on plug-in power incompatible with those devices.
In summary, plug-in power is a useful feature provided by some sound cards and other consumer equipment, allowing microphones to be powered directly through the audio cable. However, it is important to ensure that the microphone is compatible with plug-in power to avoid potential damage, and users should be aware of the increased susceptibility to electrical noise when using this power supply method.
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Voltage and sound quality
Voltage plays a crucial role in determining sound quality. Audio signals are described using voltage, and the voltage level of a signal depends on factors such as the loudness of the sound source. The relationship between voltage and loudness is not linear; to achieve a doubling of loudness, a 10 dB increase is required, which corresponds to a tenfold increase in power.
The correct voltage is essential for optimal sound quality and to prevent equipment damage. Using a device with the wrong power supply can result in erratic behaviour or a failure to produce clean audio. An underpowered amplifier is more likely to cause speaker damage than an overpowered one. When an amplifier is overdriven, it clips" the waveform, resulting in a distorted wave that is challenging for a speaker to reproduce.
In the context of microphones, condenser microphones require external power (phantom power) to function optimally. Phantom power refers to a 48V supply that provides power to microphones. Plug-in-power (PiP) is another form of power supply, typically 3-5V, used for powering electret microphones. Using the correct voltage is crucial, as connecting a microphone to the wrong power supply can result in no sound or distorted output.
Additionally, the sensitivity of a microphone can be affected by voltage. Ground lift switches, for example, can disconnect phantom power and lead to lower sensitivity in microphones.
The choice of amplifier also influences sound quality. Factors such as speaker type, room size, music type, and listening volume should be considered when selecting an amplifier. For instance, an individual with a large room who listens to pipe organ music at high volumes will require a significantly more powerful amplifier than someone in a smaller room listening to chamber music at low volumes.
Furthermore, the impedance of signals and inputs must match to avoid sound degradation and potential damage to equipment. Mismatching signals and inputs can result in a loss of high-end frequency content and volume, as well as distorted sound.
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Compatibility with other equipment
Not all sound cards are compatible with phantom power, and it is more common to find this feature in mixing consoles, microphone preamplifiers, and similar equipment. Most consumer-level audio cards do not have phantom power functionality. However, there are some sound cards available that do support it, such as the ST Audio DSP24 MEDIA 7.1, which includes a microphone preamp with 48V switchable phantom power.
When considering compatibility, it is important to note that phantom power typically operates at specific voltages, with the IEC 61938 Standard defining 48-volt, 24-volt, and 12-volt phantom powering. The specific voltage required will depend on the equipment being used. Additionally, some sound cards may require certain processors or drivers to be compatible with phantom power. For example, PCIe sound cards have been discussed as a solution for AMD processors, which may have limited options for audio interfaces with low latency.
It is also worth mentioning that while phantom power is commonly used with condenser microphones, it is not compatible with all types of microphones. Dynamic and ribbon microphones, for instance, should not be connected to a phantom-powered input as it may damage them under certain conditions. Therefore, it is crucial to ensure that the equipment being used is compatible with phantom power to avoid any potential issues.
To ensure compatibility, it is recommended to refer to the specifications of the sound card and other equipment involved. Additionally, considering the use of audio interfaces or USB adapters can provide more options for powering microphones and recording audio, as they often support phantom power and offer versatility in connecting with other equipment.
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Dynamic vs condenser microphones
Dynamic and condenser microphones differ in terms of technology but share the aim of trying to capture sound as authentically as possible. All microphones operate in the same way, converting sound waves into voltage, which is then sent to a preamp. However, the way in which this energy is converted differs. Dynamic microphones use electromagnetism, while condenser microphones use variable capacitance.
Dynamic microphones turn sound waves into voltage with the use of a magnet. They work like speakers but in reverse. In a speaker, electricity vibrates the diaphragm, creating sound waves. Dynamic microphones, on the other hand, use sound waves to vibrate the diaphragm and create electricity. This electricity is then increased with the use of a transformer and sent to the microphone's output, creating sound. Dynamic microphones are less sensitive, more robust, and do not require external power. They can take a lot of signal without being damaged due to their low sensitivity and higher gain threshold. They are often used in live situations and are easy to set up.
Condenser microphones work on the principle of variable capacitance. They are very accurate, fragile, and require external power to boost the signal. They are more sensitive to high frequencies than dynamic microphones and usually have a larger diaphragm to maximise the range of frequencies they can handle. The technology inside is complex and delicate, so condenser microphones should be handled with care. They are typically used in studios when working on an album to give a broader sound.
Phantom power is a term used to describe the DC power supplied to active direct boxes, mixing consoles, and microphones, typically at 48 volts. Nearly all modern mixing consoles have a switch for turning phantom power on or off. Plug-in-power (PiP) is a similar concept but differs in that it is a low-voltage supply (3-5 V) provided at the microphone jack of some consumer equipment, such as portable recorders and computer sound cards. It is important to note that damage may occur if a microphone requiring true 48 V phantom power is connected to a sound card providing PiP.
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Frequently asked questions
Phantom power is a way of sending DC electrical current through a balanced XLR cable to power the diaphragm and the internal amp of a microphone. It is most commonly used for condenser microphones.
Sound cards can have phantom power, but it is typically a low-current 3-5V supply. This is unlike the true phantom power which is 48V.
Plug-and-play microphones do not require additional hardware such as phantom power. Dynamic microphones also do not require phantom power and can be plugged directly into the mic input of a PC.
Phantom power can damage microphones and preamps if used with the wrong cables or adapters, or if connected to equipment other than microphones.
