How to Use Your iPhone as a Microphone for a Bluetooth Speaker
Want to speak into your phone and have it come out of a Bluetooth speaker across the room — for an announcement, a toast, a lesson, or karaoke? A phone can do this, but it's not built in: iOS won't route the microphone to a Bluetooth speaker on its own. You need an app that passes your voice through live.
Here's exactly how to set it up, and how to keep the delay as low as Bluetooth allows.
What you need
- An iPhone (or iPad)
- Any Bluetooth speaker, soundbar, headset or car audio system
- A mic-to-speaker app like Bluetooth Mic: Mic to Speaker (free)
Step-by-step setup
Pair the speaker
In Settings → Bluetooth, connect your speaker as usual. Confirm music plays through it first.
Open Bluetooth Mic
Launch the app and allow microphone access when prompted — it needs the mic to pass your voice.
Connect and set gain
Tap connect to route the mic to your speaker, then raise or lower the gain so you're clear without distortion.
Speak and monitor
Talk into the phone; live monitoring lets you hear the level. Move the phone and speaker apart to avoid feedback squeal.
Getting the best sound
- Hold the phone correctly: the mic is usually at the bottom edge — speak toward it, a few inches away.
- Set gain for the room: higher for a big space, lower for a quiet one; too high adds hiss and feedback risk.
- Reduce background noise: the phone mic is omnidirectional, so it picks up the room. Quieter surroundings sound clearer.
- Keep the speaker charged and close-ish: weak Bluetooth signal adds dropouts and delay.
About the delay
Bluetooth introduces a small lag between speaking and hearing yourself — normal for the technology. For announcements and speaking it's rarely a problem. For anything timing-sensitive (singing to a beat), it matters more; our dedicated guide covers how to minimize it.
