GUIDE · AUDIO

Audio setup for live church translation: from the sound booth to the laptop

Translation quality starts in the sound booth. This guide is for the tech team: how to get a clean feed of the spoken word from your mixer into the ChurchTranslate broadcast page, how to set levels, and how to test before the doors open.

Updated November 5, 2026

Why the input matters so much

The AI hears exactly what you send it. If the pastor's voice arrives clean and present, it recognizes the words and translates them well. If it arrives buried in room echo, the bass guitar and a baby crying in row twelve, it has to guess, and guesses turn into odd sentences in Spanish or Korean. Ten minutes spent on the feed will do more for translation quality than anything else on this page.

The goal is simple: speech only, at a steady level, with as little room sound as possible.

Option 1: a dedicated send from the mixer (best)

Most church sound boards, analog or digital, have spare outputs you can use for translation. You want a mix that contains the spoken microphones (the pastor's headset or lavalier, the pulpit mic, the announcement mic, the reading mic) and little or nothing else.

Choosing the output

An aux send. Set up a free aux bus as the translation mix. Make it post-fader for the speech mics, so when the engineer pulls down the pastor's mic after the sermon, the translation feed follows. Keep band and choir channels at zero or very low.
A matrix output. On digital consoles the matrix is often the cleanest option: feed it from the bus that already carries your spoken mics, and it follows your main mix decisions without touching the front-of-house sound.
The livestream mix. If your church already sends a separate broadcast mix to the stream, you can split that output. It will include the music, which is fine for most services, but a speech-only send usually translates better.
USB from the console. Some digital mixers can send audio to a computer over USB directly. Check your console's manual; if it works, you may not need a separate interface.

Getting the signal into the laptop

Laptop headphone or microphone jacks are not built for a line-level signal from a mixer, so use a USB audio interface. A simple two-input interface is enough. Run a balanced cable (XLR or TRS, depending on your console) from the aux or matrix output into the interface's line input, connect the interface to the laptop by USB, and select it as the input in the broadcast page.

Set the gain on the interface so the meter moves well during normal speech, then leave it alone. If you hear a hum, it is often a ground loop between the laptop charger and the sound system; a passive DI box or a line isolator between mixer and interface usually solves it.

Where the laptop lives

In most churches, the broadcast laptop sits in the sound booth next to the board, plugged into power, with the interface beside it. The tech who runs sound can glance at the input meter, and someone can switch the speaker language or press pause without leaving the booth. If your booth is short on space, a small shelf or the corner of the lighting desk works. Keep the laptop's lid open and its sleep settings off.

Option 2: a microphone straight into the laptop

No board, or a portable setup in a school gym or a fellowship hall? Plug a USB microphone into the laptop and place it close to the speaker, ideally on the pulpit or a short stand pointed at the preacher's mouth. A headset or lavalier with a USB adapter is even better. Avoid the laptop's built-in microphone if you can; it picks up the whole room.

Option 3: a phone as the broadcast device (fallback)

The broadcast page also runs in a phone's browser. For a small group, a youth event or a backup when the laptop fails, put the phone near the speaker or right in front of a monitor speaker, plug it into a charger and keep the screen awake. It works, but a feed from the board through an interface will almost always sound better.

Setting levels in the broadcast page

01
Choose the right input
Select the USB interface or microphone from the input list. If it does not appear, unplug and reconnect it, reload the page and allow microphone access in the browser.
02
Have someone talk normally
Ask the pastor or a volunteer to read a passage from the platform at normal preaching volume, not louder or softer than usual.
03
Watch the meter
The input meter should move clearly with every sentence and stay well below the top. If it barely moves, raise the send level on the board or the gain on the interface, or use the boost in the broadcast page.
04
Check the quiet parts
Pastoral prayers and communion words are often spoken softly. Make sure the meter still shows a clear signal then.
05
Listen like a visitor
Scan the QR code yourself, choose a language and listen with earbuds for a minute. You hear exactly what your listeners will hear.

Music, echo and room noise

Keep the band out of the translation mix where you can. Sung lyrics over a full band are hard to recognize and rarely worth translating. Many churches put lyrics on screen and let the translation focus on speech.
Mind open mics on the platform. A worship leader's mic left up during the sermon adds breathing, page turns and side comments.
Avoid feeding the house mix after heavy processing if a cleaner pre-processing option exists on your console. Clear, natural speech translates best.
Use the pause button for long stretches you do not want translated, such as an instrumental or a video with its own subtitles, and resume when speaking starts again.

Network and power

The broadcast laptop needs a stable internet connection for the whole service. If there is an Ethernet jack in the booth, use it with a USB Ethernet adapter. On Wi-Fi, make sure the booth has a strong signal and that the laptop is not on the same crowded guest network as two hundred phones, if you have a separate staff network. Plug the laptop into power, turn off sleep and automatic updates, and close video calls, cloud sync and other heavy apps.

Listeners use the church Wi-Fi or their own mobile data. Audio uses some mobile data but not much, so most people can listen on their phone plan. If your guest Wi-Fi has a password, put it next to the QR code.

Testing before the service

Test once during the week with the free trial service or a short broadcast: one person talks from the platform, another listens on a phone in the lobby or the back row. Try the quiet prayer, the loud announcement and the moment the band kicks in. Repeat a short check on Sunday morning before people arrive. The full timeline is in the first-service checklist.

For the bigger picture, go back to how to translate a church service. For budget questions, see costs or the pricing page.

Frequently asked questions

Should the translation feed include the worship music?

Ideally not. A speech-only aux or matrix send gives the best results. If you can only use the livestream mix with music, it still works for the spoken parts; the songs are simply hard to translate.

Do we need a special USB audio interface?

No. Any basic USB interface with a line input that your laptop recognizes will do. Some digital consoles can send audio over USB directly, which saves you the interface.

Pre-fader or post-fader aux?

Post-fader for the speech mics is usually best, so the translation feed follows the engineer's moves. With pre-fader, a mic that is muted in the house can still reach the translation.

Can we use a phone instead of a laptop?

Yes. The broadcast page runs in a phone's browser. Put it close to the speaker, keep it on a charger and keep the screen on. A laptop with a feed from the board usually sounds better.

What if the internet drops during the service?

Translation needs a live connection, so listeners lose the translation until it is back. Use Ethernet in the booth if you can, and test your Wi-Fi coverage during the week.