Loud and Clear: Audio for Experts
By Noah Bolmer
As virtual appearances, remote depositions, and hybrid hearings become standard practice, an expert witness’s digital presence carries just as much weight as a physical entrance into a courtroom. Visuals are only half the battle, as tinny, echoey, or inconsistent audio distracts from the authority of your testimony. Recent advancements in audio hardware and platform-native artificial intelligence software have raised the baseline expectation for remote proceedings. Equipment that once passed as acceptable home-office sound now risks coming across as unprofessional, but fortunately, modern gear makes achieving broadcast-quality voice isolation simpler than ever.
Microphones
While laptops and webcams usually feature built-in microphones, these tiny capsules are rarely optimized for professional audio. They sit far from your face and easily pick up room echo, computer fans, and desk vibrations, leaving you with a thin or distant sound. Dedicated microphones range from discrete wireless lapels to studio-grade desktop models, offering a solution for any budget or workspace. Selecting the right microphone is the single most effective hardware decision you can make to elevate the clarity of your remote appearance.
Wireless Earbuds and Headsets
A cost-conscious option for experts are wireless earbuds with a built-in microphone—which you may already own. While these are designed with mobile devices in mind, they will pair with most computers via Bluetooth or other wireless protocol. They produce passable audio, but they can pick up a lot of background noise, as they are designed to pick up sound that is not directly aimed at them. As with any rechargeable device, the battery degrades over time, and the capacity may not last through an extended deposition. Moreover, wireless devices are prone to dropouts, driver issues, and interference.
If you choose to use wireless earbuds, make sure they are fully charged before your appearance, that they’re paired (some wireless earbuds will only “remember” one paired device), and that they are selected as the audio source in the software you will be using. Choose a high quality pair by a name brand, ensure that the firmware is up-to-date, and conduct a test call prior to your appearance.
Wireless headsets have the same potential downfalls, but typically have a better microphone, which can be placed directly in front of your mouth. While this provides a better audio experience, they can be large and unwieldy, detracting from your professional appearance. Nevertheless, they have become smaller and less invasive, have larger batteries than earbuds, and they will typically live on your desk where they won’tbecome misplaced.
Compact Wireless Clip-On Systems
A rapidly growing alternative to both earbuds and bulky desktop gear is the ultra-compact wireless clip-on microphone (often called lavalier or “lav” mics). These button-sized transmitters clip directly to a lapel or jacket pocket, pairing wirelessly to a small receiver plugged into your computer. Unlike wireless earbuds which rely on tiny capsules positioned far from your mouth—forcing them to heavily compress sound and pick up room echo, clip-on systems feature dedicated, vocal-tuned capsules placed much closer to the source.
For an even sleeker, less intrusive look, most transmitters allow you to tuck the box into a pocket or behind a lapel and plug in a thin, traditional wired lavalier microphone. This delivers near broadcast audio quality while keeping the microphone subtle on camera, avoiding both the messy look of dangling earbud cables or the intrusive presence of a large desktop boom arm. As a bonus, premium systems feature internal 32-bit float backup recording directly on the transmitter, providing a local audio backup that cannot clip or distort even if your internet connection fails. Always ask your attorney before recording yourself.
Wired Earbuds and Headsets
A lower tech solution can eliminate some of the issues inherent in modern wireless audio devices—wired earbuds and headsets eliminate battery, driver (in the case of analogue), and interference issues. They are an inexpensive option with comparable audio quality. Analogue versions which use audio cables (make sure you have a jack) are more reliable than more modern USB versions. Unfortunately, you will have at least one cable to contend with, which may appear messy on camera or become tangled. If you choose a wired headset or wired earbuds, route the cable such that it doesn’t interfere with your appearance, and don’t forget to remove the device when you stand up or move.
USB Mics
The next step up in audio quality is a standalone USB microphone. These devices are plug-and-play but feature a larger capsule to properly capture your voice, which can give you more presence in remote settings. Both condenser and dynamic mics are available in USB versions, but for untreated workspaces, dynamics are recommended. They have superior off-axis rejection (meaning they are less prone to picking up ambient noise) and are typically less fragile. A decent USB microphone will cost between $50 to $350 dollars, depending on quality and features.
One potential drawback to USB microphones is round-trip system latency. Because your digital voice signal must be processed through your computer’s operating system and telepresence software, there can still be a slight, disorienting lag before you hear yourself through software monitoring. To bypass this issue entirely, select a USB microphone featuring a built-in 3.5mm headphone jack for direct hardware monitoring. This routes your voice directly to your ears with zero delay before it even reaches the computer. USB mics with headphone jacks also tend to feature physical dials for headphone volume, microphone gain, and mute, which are invaluable during an appearance. It is always better to adjust a physical knob than to hunt around an application for the right setting while on camera. As with any audio hardware, always conduct a quick test call prior to your appearance.
As with all USB devices, keep the firmware up-to-date, and test the mic with the software you will be using prior to your appearance with each new version.
XLR Mics, Hybrids and Interfaces
Podcast fans might notice a trend toward studio-style microphones, and it’s for good reason. For the absolute best audio quality, a microphone with an XLR connection paired with a USB audio interface is the top-of-the-line solution. These traditional mics are completely analogue, featuring no built-in digital converter or amplifier like standard USB mics. However, if you want XLR-level quality without immediately buying extra hardware, many modern options are built as hybrid USB/XLR microphones. These models allow you to plug directly into your computer via USB today, while preserving a native XLR port so you can step up to a dedicated audio interface later without replacing your microphone.
Whether you choose a hybrid or a traditional XLR-only mic, this remains an extremely mature technology—some of the most popular models are unchanged from the 1960s—offering countless designs and price points. While top-tier equipment can be an investment, XLR gear is designed to be repaired and maintained for life, and used options are readily available online and in music stores. As with USB options, a dynamic rather than condenser XLR mic is best for untreated or lightly treated rooms.
Audio interfaces allow you to plug in an XLR microphone into your computer via a dedicated hardware box. They feature high quality amplifiers for the microphone and headphones, and tend to have much more robust software than USB microphones. A quality XLR microphone can cost around $100 new, while studio quality microphones start around $450. A good, basic interface runs about $100. If you have a well-treated, quiet space and choose a condenser mic, make sure that your interface supports phantom power.
Placement
For general speaking, a dynamic mic’s optimal placement is about six inches from your mouth, with up to a 45 degree off-axis tilt to allow for off-camera placement. Remember, you want to appear professional, so you are better off increasing the gain to keep your microphone off camera, or barely in the shot.
The “microphone polar pattern” refers to the field around the mic which pics up audio most strongly. Most dynamic mic capsules are tuned to a cardioid (heart-shaped) pattern, and if it is selectable, this is what you should choose. It will allow you to make minor head movements while staying audible and rejecting noise from other directions.
To facilitate placement, consider a desk-mounted mic boom. These allow precise adjustments and far better placement than stands. Even USB mics which have stands attached typically have a boom-mounted option. It is crucial to identify whether your microphone is “top address” where you speak into the tip, or “side address” where you speak into the broad edge. In most cases, dynamic mics are top address while condenser mics are side address, so make sure you set your mic up appropriately, as it is not always immediately apparent.
Headphones
For expert witness appearances, avoid using speakers when possible. They can contribute to an echo effect, where your microphone picks up audio from the speakers, and sends it to all participants. If you are using earbuds or a headset, this is a moot point, but if you’re using a standalone microphone, you’ll want a comfortable pair of headphones or earbuds. These should be wired, so that they can connect to either the USB mic directly, or your audio interface if you use an XLR mic.
Headphones feature open- or closed-back designs, and on- or over-ear designs. Open-back headphones allow you to hear your own voice clearly, which many users prefer. This prevents a closed-in, detached feeling. On the other hand, closed-back headphones better isolate the user from outside noise, giving you a more clear idea of what everyone else is hearing. On-ear headphones are typically smaller and lighter, while over-ear designs usually weigh more, but may be more comfortable, as they do not press down on the ears.
Wired earbuds (also known as in-ear monitors, or IEM’s) are another viable option with great sound quality, if you prefer a more subtle look. These may not be as comfortable over long periods of time without expensive custom IEM sleeves made from ear impressions.
Room Treatment
Expert witnesses should choose a space that is as quiet as possible. An interior room or basement without windows is ideal, but choose whichever space has the least ambient and outside noise. It is important to distinguish between soundproofing to block outside noise and acoustic treatment to reduce room echo. True soundproofing requires heavy structural construction, whereas dampening room echo can be done far more affordably.
Before purchasing dedicated audio gear, you can treat room echo simply by adding soft surfaces to your workspace, such as an area rug on hard floors, plush furniture, heavy curtains, or wall-mounted bookshelves. To further dampen reverb, you can use acoustic panels or a specialized microphone isolation shield. However, these tools only absorb high-frequency reflections off walls; they will not block low-frequency ambient noise like passing traffic, thunder, or footsteps from above. For untreated spaces, relying on a dynamic microphone kept close to your mouth, combined with your video software’s built-in background noise suppression where applicable, remains the most cost-effective way to achieve clean, professional audio without expensive renovations.
Audio Settings
To ensure clear transmission, it is important to adjust microphone gain separately from output volume. Gain controls the sensitivity of the microphone capsule to incoming sound, whereas audio volume controls how loud that signal plays back through your headphones or speakers. USB microphones and hardware interfaces typically feature a physical knob for gain adjustment, while basic built-in microphones rely on your computer’s audio panel under settings labeled input volume or recording volume.
To calibrate your audio properly, first listen to standard audio on your computer to set your headphones to a comfortable listening level. Next, unmute your microphone and increase the gain until your voice is crisp and clear, but not so high that it picks up background hum or room echo. Using closed-back headphones during this step is helpful because they isolate what the microphone is capturing from the physical acoustics of the room. Record a quick test clip and listen back in a quiet spot. If you hear anything other than your voice, lower the gain until only your voice remains audible.
If you cannot isolate your voice from ambient noise using gain adjustments alone, you may need to rely on your telepresence software’s built-in audio features. Most video platforms offer background noise suppression ranging from basic ambient filters to AI-assisted voice isolation. These tools can significantly improve audio clarity, but aggressively setting them can consume processing power or create robotic, “underwater” audio artifacts. Test these features on a sample recording prior to your appearance to ensure they do not distort your voice, and confirm with counsel that your software processing will not interfere with the court reporter’s record.
Technique
Exercise good mic technique, regardless of what type of microphone you choose. Try to limit dramatic changes in speaking volume. Moving toward and away from the mic changes not only your audio volume, but the overall timbre. This “proximity effect” can be jarring, so try to remain at a constant distance. Hard plosives—letters like P, T, and K—can create bassy booms and pops. In microphones with lightweight capsules near the tip rather than heavier ones recessed in the body, this is more pronounced. Practice speaking with less emphasis on those letters, or consider a pop screen if your mic is sensitive.
Mic-specific pop screens and wind screens are typically available, so check your microphone manufacturer’s website. Similarly, generic pop filters which can be affixed to a desktop boom arm are another option, although they can be quite large. Stay hydrated to help reduce mouth noises, and mute your mic when you are not in a conversation. Note, this doesn’t mean you should mute every time you stop talking; only when you are not going to be speaking for a while. Control your breathing while speaking to avoid heavy breaths into the mic.
Conclusion
Don’t let poor audio get in the way of a productive remote engagement. Practice speaking and listen to recordings of your voice to make any adjustments prior to your appearance. Keep your drivers and firmware up to date. With a quiet room, quality gear, and proper technique, the content of your expert opinion will come through loud and clear!
For over 30 years, Round Table Group has been connecting litigators with skilled and qualified expert witnesses. If you are interested in being considered for expert witness opportunities, contact us at 202-908-4500 for more information or sign up now!