How to Set Up an Audio Interface on macOS

Before you start

You need an audio interface that is compatible with your Mac and either a USB, Thunderbolt, or similar connection cable that fits both devices. Check whether the interface is class-compliant or requires a driver from its manufacturer. Many modern interfaces work as class-compliant devices and appear in macOS without extra software, while some models need a manufacturer driver or control application. The setup is performed locally on the Mac and does not require an online service.

Step-by-step instructions

1) Connect the audio interface to the Mac with the appropriate cable and turn on the interface if it has a power switch or external power supply.

2) If the manufacturer provides a driver or control utility for your macOS version, install it before making the interface the active input and output device. Restart the Mac after installation when prompted.

3) Open System Settings from the Apple menu and choose Sound. In the Output & Input section, select the audio interface as the output device so playback is routed through it.

4) In the same Sound settings, choose the interface as the input device. If the interface exposes multiple input options, select the input that matches the microphone or instrument connected to it.

5) Set the input level using the Input volume slider in macOS or the gain control on the interface. Speak or play at the expected volume and adjust the gain so the level meter stays strong but does not constantly hit the maximum.

6) Open Audio MIDI Setup from the Utilities folder inside Applications. Select the audio interface and check its format settings, including sample rate and bit depth. Keep the sample rate consistent with the app you plan to use, such as a video call or recording tool.

7) In the app you are using, open its audio preferences and confirm that the audio interface is selected for both microphone and speaker. Some apps have their own device menus that override the system setting.

8) If the interface provides a mute, direct monitoring, or phantom power button, enable only what is needed. Phantom power should be switched on only for microphones that require it.

Check the output

Play audio through the Mac and confirm that sound comes from speakers or headphones connected to the interface. Then make a short test recording or open the input level meter in your recording or call app to verify that the connected microphone or instrument produces a clear signal. The expected result is stable sound without distortion when the level is set correctly. Keep the sample rate the same across macOS and the app to avoid mismatched playback or recording.

Common problems and next steps

If the interface does not appear as an input or output device, check the cable connection and try a different port directly on the Mac. For an interface that needs a driver, confirm that the installed version supports the current macOS version and reconnect the device.

If the recorded level is too low, move the microphone closer and increase the interface gain before raising software volume. If the signal distorts, lower the gain or input level and test again. For a weak or noisy signal, reduce background noise such as fans or appliances and make sure the correct input is selected when the interface has several input channels.

If playback is silent, check that the interface is selected in both the app and macOS as the output device. If audio plays at the wrong speed or pitch, compare the sample rate in Audio MIDI Setup with the rate set in the recording or call app and make them match.

When a video call or recording app cannot use the interface, close the app, change the device selection in macOS, and reopen the app. Some apps read the device list only at launch, so the app may need to be restarted after connecting a new interface.