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Audio For Motion picture 101: A Guide to Powering Your Video Mic

Every condenser microphone needs power to operate. Obviously and simple. How much power, and where that ability comes from, depends on what kind of mic you are using. When it comes to using a video mic, there are three primary power sources that will provide the juice it needs: your photographic camera (called 'plug-in power'), batteries, or what is known as 'phantom power'. The blazon of power your mic uses will depend on its size, features, and capabilities. Let's accept a look at the differences betwixt the three.

Why Practise VideoMics Need Power?

First of all, it's helpful to understand why your mic needs power to operate. All of our VideoMics and shotguns are condenser microphones, and virtually condenser mics need to be powered by an external source. Dynamic mics such as the RØDE M1, generate all the electric free energy they demand to operate internally, which is part of the reason they are ideal for alive performance – they don't require external power. Condensers, on the other paw, crave a voltage across the capacitor housed inside its capsule to operate, and this voltage needs to come from an external source. Such as…

Plug-In Power (Also Known as Bias Power)

Plug-in power is exactly what it sounds similar: ability is supplied to the mic straight from your DLSR photographic camera via the three.5mm TRS minijack used to connect the two. It can likewise be supplied by smartphones, computers, or a transmitter device if you're using a wireless mic system. You won't need to movie any switches to get information technology flowing – just plug your mic in and you're practiced to get. Mics that use plug-in power commonly only require a small amount of voltage to operate, around 3-5V.

A few of the mics in our VideoMic range use plug-in power to operate, including the VideoMicro, VideoMic GO and VideoMic GO II. Information technology should exist noted though that some cameras and recording devices do not provide plug-in power (though most modernistic devices should). If your camera doesn't, you'll need to become a battery-powered mic like the VideoMic Pro.

Check out a listing of cameras and their power-giving capabilities here.

If you are using your VideoMic with a MacBook Pro (by plugging straight into your figurer's headphone port using an SC4 adapter cable), keep in mind that some models only work with mics that utilise plug-in power – i.e. the VideoMic Go, VideoMic Get Two and VideoMicro – as these have components that your Mac volition detect, identifying information technology as a uniform microphone. Battery-powered mics don't have this component, making them invisible to your computer. This same upshot tin can occur with some models of PC depending on the motherboard and onboard soundcard that is used. You tin read more than about this here.

Battery Ability

That brings us to battery-powered mics. Most video mics that run on batteries take more features than those that employ plug-in power, equally the bombardment tin can power more functions. Accept our VideoMic Pro+ for example. It packs in a agglomeration of useful features for recording on-camera audio, such as a 2-stage high pass filter, iii-stage gain control, and loftier-frequency heave, and tin run from two AA batteries.

If you lot do ain a VideoMic Pro+ and detest having to constantly buy new packs of AAs, check out our LB-1 lithium-ion bombardment. This handy lilliputian pack is fully rechargeable, and when used in the VMP+, can even exist charged when it is in use. But plug information technology into a portable ability source using the included microUSB cable for not-terminate recording.

Some shotgun mics run on batteries besides, and this is perfect for situations where phantom power is non available. The RØDE NTG2 can run on a single AA bombardment, and the NTG4+ has a built-in rechargeable lithium-ion battery – in fact, it was the outset mic e'er to do so! – that provides 150-plus hours of performance with the convenience of portable USB charging.

Phantom Power

Some professional-grade shotgun microphones (such as the RØDE NTG3) and VideoMics (like the Stereo VideoMic X) run on phantom power, though the term is more mutual in the realm of studio microphones. Phantom power is usually supplied by a mixer or recording interface, however, some loftier-end video cameras, such as the Blackmagic Pocket Cinema Camera 4K can supply it as well. It is ever delivered via the same XLR cable used to connect the microphone to the photographic camera or mixer. Phantom power is usually 48V, although some (ordinarily older) equipment may supply less than this, so cheque in accelerate to ensure your mic is compatible with your equipment before heading out on a shoot.

A Notation on XLR Inputs

If you have a VideoMic with a three.5mm output and desire to plug information technology into a camera with an XLR input or an external recorder, you can do and then using a VXLR adapter. This volition work perfectly with a microphone that runs on batteries (i.e. does not need plug-in power to operate). If your mic does run on plug-in power (such as the VideoMic GO), you can use a VLXR+, which will take the 48V phantom power supplied by the recorder and convert it to three-5V plug-in ability. (Note the VXLR+ works fine with bombardment-powered VideoMics too). Plugging directly into a phantom power source without a step-down adapter similar this could harm your mic, then ever use the proper XLR adapter from RØDE, rather than a jury-rigged cablevision.

Check out our VideoMic range here and discover out more nigh the basics of recording audio for film hither. If you have any questions well-nigh your powering your RØDE mic, have a expect at its specifications or get in touch on with our back up team.

Source: https://rode.com/en/about/news-info/audio-for-film-101-a-guide-to-powering-your-video-mic

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