Morning all,
Found a solution to play sound through multiple devices WITHOUT the scratchy, fuzzy, or clicking sounds.
- Open > Audio MIDI Setup
- Add new device with the "+" in the bottom left corner of the window
- Click "Create Aggregate Device" — Something is wrong with the "Create multi-output device" option, so don't use that.
- Add the two (or more) devices you want to use as part of the new aggregate device. In my case, I'm trying to get audio to play through both the audio jack in my MacBook and wirelessly to a set of Bluetooth speakers. Notice, some of the devices will show up more than once if they have their own built in microphones, one as an "input" device and another as an "output" device. If you're trying to play music to them, add the device with output channels.
- At this point, audio will go to one device (if the devices are stereo), because it is outputting audio to only two channels, instead of the (in my case) four channels: two channels through the audio jack, and two channels through the Bluetooth speaker.
- In the bottom right hand corner, click the "Configure Speakers..." button.
- Click the "Multichannel" button
- In the dropdown menu, select "Quadraphonic"
- Check both devices at the top of the box, and the mac will set you up with four outputs to send audio to all devices.
Honestly, I don't know if all channels are being played. I think what's happening is each device is either right or left audio, and the "3" and "4" channels just aren't being played.... But, it's better than hearing fuzz.
Also, from time to time, there is a little crackle, but very minimal, and only once in a while. Ultimately, Apple needs to fix all this, but a decent fix for now.
Enjoy!