Guides
Every guide here is written against something we could measure or verify. Where the honest answer is “no”, it says no.
Bluetooth Microphone Delay: Real Numbers, Real Fixes
Where the 100–250 ms comes from, which fixes actually move the number, and a browser test for your own speaker.
Read it →Connect iPhone Microphone to a Bluetooth Speaker
iOS Settings does the pairing, not the app. The routing steps, and what to do when the speaker will not show up as an output.
Read it →Bluetooth Microphone App With No Delay? Measured
Several listings promise no lag. Here is what the delay floor actually is, measured, and how close to it you can get.
Read it →iPhone as a Microphone for a JBL Speaker
Which PartyBox, Flip and Charge models take a real microphone, and when a £5 cable beats any app.
Read it →Karaoke Bluetooth Speaker Delay: Measure and Fix It
Singing is the worst case for Bluetooth delay. Measure yours, then decide whether to go wired.
Read it →Microphone Feedback With a Bluetooth Speaker
Why a phone microphone howls near a speaker, the distance and gain rules that stop it, and a live demo of the guard.
Read it →Live Listen to a Bluetooth Speaker: Why It Won't Work
Live Listen only outputs to AirPods and Beats. What it is genuinely good at, and what to use for a speaker.
Read it →Can a Bluetooth Speaker Take a Microphone Input?
Almost no Bluetooth speaker has a microphone input or a preamp. Why, and how the phone becomes the transmitter instead.
Read it →Why Bluetooth Sound Drops When the Mic Turns On
The A2DP to HFP profile switch, what it costs, and the setup that sidesteps it completely.
Read it →Does iPhone Support aptX Low Latency? No - AAC Only
No — the iPhone is AAC only. Which means half the standard latency advice on the internet does nothing for you.
Read it →SBC vs AAC vs aptX Latency: Sourced Numbers
Every published figure, cited to its source instead of averaged into one convenient number.
Read it →How Much Audio Delay Is Noticeable?
The thresholds for lip sync, live monitoring and singing, so you can tell whether your number matters.
Read it →iPhone Bluetooth Mic Apps Compared by Latency
What actually separates the mic apps on the App Store, measured rather than claimed.
Read it →Android Phone as a Microphone for a Bluetooth Speaker
It works, and Android gives you one lever iOS does not: a codec picker in Developer options. What that changes, and what it does not.
Read it →Phone as a Microphone for a Bose Speaker
SoundLink, Portable and the S1 Pro all behave differently. Which one takes a real microphone.
Read it →iPhone as a Microphone for Soundcore Speakers
Motion, Boom and Rave differ on microphone input. What each one will and will not do.
Read it →Phone as a Microphone Through a Car Stereo
Why the car is the one place this almost never works the way people expect.
Read it →AirPlay Microphone: HomePod and Apple TV Latency
AirPlay adds far more delay than Bluetooth. What that means if you were hoping to use a HomePod.
Read it →Voice Amplifier on iPhone: Gain Without Feedback
What a voice amplifier app can and cannot do, and where it stops being enough.
Read it →Two Bluetooth Speakers Out of Sync: Measure the Gap
Why two speakers drift apart, and why the answer is almost never the phone.
Read it →Wired vs Bluetooth Microphone Latency
The measured gap between a cable and a Bluetooth link, and the situations where only the cable will do.
Read it →Test Your Microphone Before the Party: 5 Steps
Ten minutes of checks that stop the microphone failing in front of everyone.
Read it →Phone Microphone for Announcements and Talks
Turning a phone into a small PA for a hall, a classroom or a coach party.
Read it →Free tools that run in this tab
No sign-up, no upload, no app needed to use them. Everything happens on your own device.
Live mic monitor
Hear your own microphone through your speakers or headphones, with the app’s gain range and its eight voice presets.
Open it →Bluetooth latency test
Measures the real round-trip delay of your own speaker by sending a chirp and listening for it coming back.
Open it →Bluetooth mic test
Check the level, the sample rate and the channel count of any microphone — including the moment a Bluetooth headset drops to narrowband.
Open it →Bluetooth speaker test
Left and right channel checks, a 20 Hz–20 kHz sweep and a bass sweep, to find out what a speaker actually reproduces.
Open it →Live voice effects
All eight of the app’s voice presets, live on your own voice, with the frequency-response curve each one applies.
Open it →