Apple Music Hi-Res Lossless vs. Lossless

Apple Lossless is CD quality: 16 bit at 44.1 kHz (kilohertz), and goes up to 24 bit at 48 kHz

Apple Hi-Res Lossless: 24 bit at 192 kHz

When playing a Lossless or Hi-res Lossless via Apple Music on a Mac, you need a DAC connected via USB that supports the lossless sample rates. Some speakers have built in DAC. I have Audioengine A2+ speakers which support up to 24 bit at 48 kHz.

If you don't have decent speakers and equipment, don't worry about lossless. You will likely not hear a difference.

This article goes into much more detail: https://www.apple.com/newsroom/2021/05/apple-music-announces-spatial-audio-and-lossless-audio/.

BTW, Apple TV 4K (2 Gen) does not support Hi-Res Lossless. My Living room audio equipment can support it -- only if AT4K could.

The "lossless" tracks have a sample rate of 44.1kHz or 48kHz. They may become available in hires later, which means that they will still be lossless but with a sample rate >48kHz.