Setup

If you have a compatible service subscription and hardware setup, you’ll be able to stream and listen to the playlist in HI-RES (@ up to 24 bits & 192 kHz) from your iPhone, iPad or Mac.

The simplest mobile setup has some digital to analog conversion from the source to a capable in-ear monitor/driver.

Here are a few options I personally vouch for. Everything is available via Amazon (US).

Digital-to-Analog conversion
In-ear monitors (wired)
Powered studio monitors
Adapters

If you prefer a wireless setup for your Apple ecosystem, while they don’t support Hi-Res and/or lossless audio, they sound great with the new Spatial Audio feature from Apple, or have a great third party implementation of 360 natural surround sound.

Apple AirPods 3
Apple beats Fit Pro
Jabra Elite 75t
Technics EAH-AZ60

If you prefer to use streamers, shelf/desk studio monitors, or a hi-fi system, here are some of the best in the industry.