Features
One Mac, many headphones
Pick any two outputs and Tandem plays the same audio to both, kept in step. No cables, no splitter, no second device.
Most people pair two, but you can add more when the moment calls for it.
Honest note: Two of the same headphones stay tightest in sync. Two very different Bluetooth models can sit slightly apart due to their own built-in delay.
Tandem
Your headphones
Partner's headphones