You can use Audio MIDI Setup to configure audio input and output devices that you use with your iMac, such as microphones and multichannel audio interfaces. Audio MIDI Setup works with many types of audio and MIDI interface devices, including your computer’s built-in audio and digital multichannel audio devices. It works with devices connected to your iMac using FireWire, USB, Bluetooth, PCMCIA, and PCI.
Now click on the option saying, “App volume and device preferences” as highlighted in the image shown above. In the “App volume and device preferences” window, you can set the per app sound output by choosing an appropriate output from the Output dropdown list corresponding to every individual app as highlighted in the image shown above. May 10, 2019 It’s possible that if you’ve installed an app like that, its driver could be interfering with your Mac’s sound output. Go to System Preferences and choose Sound. Click on the Output tab. If there’s an output option that looks like a software app and it’s selected, that may be why the sound is not working on your Mac. On your Mac, choose Apple menu System Preferences, click Sound, then click Output. Select the device you want to use in the list of sound output devices. All sound output devices available to your Mac are listed, including the computer’s internal speakers, devices plugged into your computer’s sound port , USB speakers, and AirPlay devices.
The settings you can change in Audio MIDI Setup depend on the audio device you’re using. For example, if the device supports volume control, you can adjust the volume for each channel your audio output device has available by following these steps:
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Change Audio Output Mac
- Connect your audio devices to your iMac. If necessary, install any software included with the devices. See the documentation that came with your audio devices.
- Open Audio MIDI Setup (you can find it in Utilities, inside your computer's Applications folder).
- Choose an audio device from the list on the left side of the Audio Devices window.
- To use the device for sound input, choose 'Use this device for sound input' from the Action pop-up menu.
- To use the device for sound output, choose 'Use this device for sound output' from the Action pop-up menu. If you also want to use the device to play system sounds, choose 'Play alerts and sound effects through this device' from the Action pop-up menu.
- On the right side of the Audio Devices window, choose the options available for the device you're setting up:
- In most cases, leave the 'Clock source' pop-up menu on the default setting.
- To set up surround (multichannel) speaker configurations, click Configure Speakers. Then, choose the type of configuration you want to use. See Set up external speakers for stereo or surround sound for more information.
- You can set the sample rate and bit depth in the Format pop-up menus. Make sure they match the appropriate settings for your audio device and that the input and output sample rates are set to the same value. For example, the built-in speakers of an iMac computer may appear like this:
Additional settings
- If your iMac supports the hardware sample rate converter, the Hardware Rate Converter pop-up menu is available in the Input menu. When you choose Automatic from the pop-up menu, the hardware sample rate converter is turned on if the audio samples coming in are PCM and formatted according to the international standard IEC 60958-3. The hardware sample rate converter is turned off if the input stream is encoded. You can also choose Enable or Disable from the menu to keep the hardware sample rate converter turned on or off.
If you choose Enable from the menu, you may not be able to stream non-LPCM or encoded audio because the audio may not be recognized. - If software volume control is available for your device, the Volume sliders are blue to indicate they are active. Drag the sliders to set the volume for each channel.