Interpretation headsets or phones: how should your audience hear the translation?
There are two ways to get a translation into someone's ear at a live event. Receivers and headsets, handed out at the door, carry an interpreter's voice over radio or infrared. Phones, which the audience already owns, carry it over the internet after a QR code scan. Receivers work without a network and suit a room with human interpreters and an equipment budget. Phones need nothing handed out, reach people outside the room as well, and are how AI translation is delivered. Plenty of events use both.
The two, side by side
| What | Receivers and headsets | Listeners' own phones |
|---|---|---|
| How the audio travels | Radio (FM or digital) or infrared, from a transmitter in the room. | The internet, over the venue Wi-Fi or mobile data, to the phone's browser or an app. |
| Who translates | Human interpreters, one per channel and language, usually two taking turns. | Human interpreters, AI, or both. AI needs no booth and covers many languages at once. |
| What you hand out | A receiver and headset per listener, collected, cleaned and charged afterwards. | A QR code on the screen or the programme. Spare earbuds help. |
| How the cost grows | With the number of listeners (receivers) and of languages (interpreters and channels). | Depends on the service: some charge per listener, others, like Koine, per language-hour only. |
| Outside the room | Only within range of the transmitter. | Anywhere: overflow rooms, at home, on the train. |
| What goes wrong | Flat batteries, receivers that walk out the door, a queue at the desk, the wrong channel. | Weak Wi-Fi, flat phones, forgotten earbuds, and people who cannot or will not use a phone. |
When receivers and headsets are right
When the event already has human interpreters in a booth, which is the way most diplomatic, legal and large international conferences are run. The booth standard, ISO 4043, assumes two interpreters per language who take turns, and an infrared or radio system is the established way to carry them to the seats. Receivers also work where there is no reliable network, in a basement hall or a rural venue, and for audiences who do not carry smartphones. Interpretation equipment is rented with a technician, and rental firms quote per day on the number of receivers and channels.
When phones are right
When there is nothing to rent and nobody to hand out receivers, which describes most churches, schools, council meetings and smaller conferences. People already carry a phone and earbuds; a QR code at the door replaces the desk, the queue and the charging case. Phones are also how AI translation is delivered, which matters when the room needs five or ten languages and there is no budget for ten interpreters. And the same link works for the overflow room and for people following from home.
With Koine, one feed from the soundboard becomes translated voice and captions in 132 languages, in the browser, with no app or account. Each language is translated once and shared, so the bill is USD 10 per language-hour however many people listen. An interpreter you bring can also voice a language through Koine from their own phone, with the AI as backup. It is machine translation, and a qualified interpreter is still the right choice for medical, legal or contractual conversations.
Using both
Mixed events are common: interpreters for the main languages, carried on receivers or phones, and AI on phones for the languages nobody budgeted for. Some services carry human and AI channels side by side; Koine vs LiveVoice and Koine vs Interprefy cover two that put interpreters on phones.
Before the event, whichever you choose
- Feed it from the desk. Interpreters and AI both need clean speech from the soundboard, not a microphone picking up the room. How to send it.
- Test the network in the full room. For phones, try the venue Wi-Fi with people in it, not the empty hall the day before.
- Announce it. Say from the stage how to get the translation, in the languages it is for.
- Keep a fallback. A few spare earbuds, a charger, and someone who knows who to call.
Common questions.
Can attendees use their own phones instead of interpretation headsets?
Yes. Services such as Koine send the translation to each attendee's phone after a QR code scan, in the browser, so there is nothing to rent or hand out. Attendees bring their own earbuds; keep a few spares at the door.
Do phone-based systems need Wi-Fi?
They need an internet connection: venue Wi-Fi or mobile data. Translated audio uses little data, but a crowded network can struggle, so test it with the room full. Receiver systems work without any network.
Can human interpreters work through phones?
Yes. Several services carry interpreters to phones. With Koine, an interpreter you bring voices a language from their own phone, with the AI as backup.
Which is cheaper, receivers or phones?
Receivers and interpreters cost more as the audience and the number of languages grow. Phone-based AI translation usually costs far less; Koine charges USD 10 per language-hour and nothing per listener. The cost guide works through examples.