What is spatial audio?

What is spatial audio supposed to sound like, and what is it compatible with?

Apple exec Eddy Cue says 99/100 won’t tell the difference with Apple Music HiFi

As the excitement about high fidelity music grows with Apple Music launching it free for all users, Eddy Cue says he doesn’t think it’s very important. Apple recently revealed that they’d be bringing lossless, high…