Choosing a Dynamic Microphone for Broadcasting

A broadcast-style dynamic microphone is a common choice for voice work in rooms without acoustic treatment. Dynamic capsules are generally less sensitive than condensers, so they tend to pick up less of the room and less distant background noise when you speak close to them. This guide covers how to pick one that fits your setup, connect it and confirm that it actually sounds right in your space.

Before you start

Choosing, connecting and testing the microphone happens locally. The mic does not need an online service to work. If you choose a USB model that comes with companion software, check the vendor's documentation to see whether that software needs an account, runs processing on your computer or sends data anywhere. Do not assume either way.

• Know the connection your setup accepts. An XLR microphone needs an audio interface, mixer or recorder with a microphone preamp. A USB microphone connects directly to the computer. Some models offer both outputs.
• Check whether you have enough clean gain. Many broadcast dynamics have low output. Compare the microphone's published sensitivity with the maximum gain listed for your interface or mixer before you buy.
• Plan the mounting. Decide between a boom arm and a desk stand, and confirm that the microphone's mount thread fits it or that an adapter is included.
• Have closed-back headphones ready so you can monitor without the speakers feeding back into the mic.
• Note which app you will broadcast or record in, and whether it lets you choose a specific input device.

Step-by-step instructions

1. Match the pickup pattern to your room

Most broadcast dynamics are cardioid, supercardioid or hypercardioid. All of them reject sound from the sides and rear, but in different ways. Cardioid rejects most strongly directly behind the mic. Supercardioid and hypercardioid are narrower at the front but have a small rear lobe. Look at the polar diagram in the specifications and plan where noise sources such as a computer fan, a window or a door will sit relative to the microphone.

2. Confirm end-address or side-address

An end-address mic is spoken into from the top. A side-address mic is spoken into from the side. Many broadcast dynamics are end-address, but not all, so check the manual. Speaking into the wrong side makes even a good microphone sound thin and distant.

3. Pair the mic with enough preamp gain

If the microphone's output is low and your interface has limited gain, you may have to turn the gain near its maximum, which can add hiss. Common options are an interface with more clean gain or an inline microphone booster. Most inline boosters draw phantom power from the interface, so read the booster's manual and the microphone's manual before you enable phantom power, and turn it on only on the channel that needs it.

4. Review built-in tone switches and accessories

Some models include bass roll-off or presence boost switches, an internal shock mount or a thicker windscreen. Start with all switches in their flat position. Change one setting at a time and record a short test after each change so you can always go back.

5. Select the input and output devices

Connect the mic and choose it, or the interface it is plugged into, as the input device in your operating system's sound settings and again inside your broadcast or call app, since apps can override the system default. Set your headphones as the output device. With an XLR mic the computer sees only the interface, so select the interface rather than looking for the mic by name. If the app cannot see the mic, check your operating system's microphone privacy permissions for that app.

6. Align the sample rate

Use the sample rate your project or platform expects. Many video workflows use 48 kHz. Keep the interface, the operating system and the app on the same rate where you can, because mismatches can cause clicks, pitch problems or devices that refuse to open.

7. Set the input level and mic position

Place the mic close to your mouth at a distance you can hold steadily, and angle it slightly off your mouth to reduce plosives. Speak at your real broadcast volume, including laughter or emphasis, and raise the gain until normal speech reads clearly on the meter while the loudest moments still leave headroom below the top. Moving closer adds bass through the proximity effect, so keep the distance consistent once the sound is right.

Check the output

• Record a short test that includes normal speech, a few loud moments and several seconds of silence, then listen back on headphones.
• In the silent part, listen for steady hiss, which usually points to gain pushed high on a weak preamp, and for room or fan noise, which points to positioning or pickup pattern.
• Listen for popping on P and B sounds, harsh S sounds and excessive bass from sitting too close.
• Confirm the recording came from the intended input device and not from a built-in laptop or webcam microphone.
• Check that the recorded file uses the sample rate your project expects.
• If you broadcast through a call or streaming app, test with its noise suppression and audio processing both on and off where the app allows, because that processing changes the sound your audience hears.

A test recording reflects your own room, preamp and voice. Reviews and demos recorded elsewhere may not match what you hear, so judge the mic by your own recording in your own space.

Common problems and next steps

• Too quiet even at maximum gain: confirm the correct input is selected, move closer to the capsule, and check whether the mic's output is too low for your preamp. An interface with more gain or an inline booster is the usual fix. Boosting a weak signal heavily in software also raises the noise.
• Microphone not detected: an XLR mic is never detected directly by the computer, so check the interface connection and its driver. For USB, try another port and cable, then review the microphone permissions for the app.
• Hearing yourself twice or with delay: direct monitoring on the interface and software monitoring in the app are both active. Turn one off.
• Boomy or muddy voice: back away slightly or try the bass roll-off switch if the mic has one.
• Thin or distant voice: check that you are speaking into the correct end or side and that you are close enough.
• Clicks, crackles or robotic sound: align sample rates across the interface, system and app, and close other apps that use the same audio device.
• Background noise still audible: a dynamic mic reduces room pickup but does not remove it. Turn noise sources toward the mic's rejection zone and speak closer so you can lower the gain. If you add a noise suppression tool, check its documentation to see whether processing happens on your device or on a remote service.