A microphone that shows as connected but captures nothing, or almost nothing, is rarely a hardware fault. The usual causes are a denied app permission, the wrong input selected, a physical mute switch, the input level turned down, or noise reduction suppressing quiet speech. All five are quick to check.
Every one of these looks identical from the outside: the microphone appears in every list, the cable or Bluetooth connection is fine, and the app still hears nothing. Work through the checks below in order and you will land on the real cause well before you get to replacing anything.
Has the app actually been given microphone permission?
This is the single most common cause, and the easiest to miss because the microphone still looks selected everywhere else. Open System Settings, then Privacy & Security, then Microphone. Every app that has ever asked to use the microphone is listed there with its own on/off toggle, separate from which device is chosen as the input.
An app can be the selected input device in every other menu and still record silence if its own toggle on this list is switched off. macOS normally asks permission the first time an app tries to use the microphone, but a dialog dismissed too quickly, or a permission changed months ago and forgotten, leaves the app silently blocked with no further prompt. Turn the toggle on, then fully quit and reopen the app, since most apps only check this permission once at launch.
Is the wrong microphone actually selected?
Open System Settings, then Sound, then the Input tab, and check which device has the blue selection ring around it. This sets the system default, but a second, separate check matters just as much: several call apps, including Zoom and Discord, keep their own microphone dropdown inside their own settings, entirely apart from the system default. Changing one does not change the other.
Watch the input level meter in that Sound settings pane while you talk. A meter that stays flat despite the correct device being selected is a strong sign the problem is downstream of device selection, in permission, mute state, or input level, rather than device choice itself.
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Plenty of headsets and standalone microphones carry a physical mute button or switch, often on the cable, the earcup, or the base of the mic itself. Muting this way happens in the device's own hardware or firmware, not in macOS, so the microphone still shows up as connected and even stays selected as the input while producing no signal at all. There is no on-screen warning for this, because macOS has no way to see it.
Most of these switches show a small light or coloured ring when muted, but it is easy to miss on a desk, in a bag, or under a jacket. If the level meter in Sound settings stays completely flat rather than merely quiet while you speak, check the microphone itself for a mute control before checking anything in software.
The input volume slider might be turned down separately
The same Sound, then Input pane in System Settings has its own input volume slider beneath the device list, entirely separate from the output volume most people adjust day to day. It is easy to drag this down by accident, and some third-party audio hardware ships with it set low by default. A microphone with the input slider near zero will register on the level meter, just barely, which is a useful way to tell this apart from a permission or mute problem: those produce a completely flat meter, this produces a very faint one.
Could noise reduction be suppressing your voice, not just the background?
On some Macs and microphones, the Sound, then Input pane also includes an Ambient Noise Reduction toggle, or an equivalent noise-suppression option supplied by the microphone's own driver. These work by cutting audio below a certain threshold, and a quiet voice, a quiet room, or a microphone positioned further from your mouth than usual can fall under that threshold along with the background noise it was built to remove. The result sounds like a broken microphone rather than an aggressive filter. Turn the setting off and speak at a normal level to test whether the drop in loudness was macOS trying to help rather than the input itself.
A quick checklist if the microphone still seems silent
- Recheck the permission toggle after any macOS update. Major updates occasionally reset app permissions back to their default state.
- Test in Voice Memos or QuickTime first. Both use the plain system input with no app-level microphone picker of their own, which rules out app-specific settings.
- Restart the app after changing any setting. Several apps read the microphone once at launch and will not notice a change made while they are already open.
- Try a different USB port or re-pair Bluetooth devices. A flaky physical connection can look identical to a software problem from the level meter alone.
Where Chorus fits, and where it does not
Chorus does not touch microphone permissions, and it cannot grant or fix one that macOS has denied. That setting lives entirely in System Settings, and nothing outside it can override the choice an app or the operating system has made. If a microphone is silent because of a permission, a mute switch, or a settings level, the checks above are the fix, not Chorus.
Where Chorus is genuinely useful is the step after that: once you have more than one working microphone, say a built-in mic and a headset mic, Chorus lists every input in its own menu-bar panel and lets you switch the active one with a click or a keyboard shortcut. That replaces reopening System Settings and checking Sound, then Input, every time you want to confirm or change which microphone is live.
For the full detail on Voice Isolation and Wide Spectrum, see Apple's own guide to Mic Modes.
Frequently asked questions
Why does my microphone show as connected but not pick up any sound?
The most common cause is a denied microphone permission for that specific app. macOS lists every app that has asked to use the microphone in System Settings, under Privacy & Security and then Microphone, and each one has its own on/off toggle. An app can be selected as the input device and still capture nothing if its own toggle there is switched off.
How do I check microphone permissions on a Mac?
Open System Settings, then Privacy & Security, then Microphone. Every app that has ever requested microphone access is listed there with its own toggle. Turn the toggle on for the app that needs it, then quit and reopen that app, since most apps only check the permission once at launch.
Why does my headset microphone stay silent even though it's selected?
Check for a physical mute switch or button on the headset itself. Many headsets mute the microphone in hardware or firmware, which macOS cannot see or override, so the device still shows as connected and selected while producing no signal at all.
Can turning off Ambient Noise Reduction fix a quiet microphone?
It can. Ambient Noise Reduction and similar noise-suppression settings, found in System Settings under Sound and then Input for some Macs and microphones, can suppress quiet speech along with background noise. Turning it off is a quick way to test whether it is the cause before assuming the microphone itself is faulty.
Does Chorus fix microphone permission problems?
No. Microphone permissions are controlled by macOS in System Settings, and Chorus cannot grant or change them. Chorus becomes useful once a microphone is already working, letting you switch between multiple working microphones from the menu bar instead of reopening System Settings each time.
