Which streaming services are compatible with the HD6?

The HD6 are capable of  providing audio playback for any and all audio that your source device is capable of playing.  Your source device would be the device your speakers are currently connected to either via the analog inputs, Bluetooth, or the optical cable.  They will play back audio from any streaming service including but not limited to:  

• Tidal
• Spotify
• Pandora
• iTunes/Apple Music
• Amazon Music
• YouTube
• Sirius XM
• Qobuz