Harman Kardon's new Citation 500 is a multi-room capable smart speaker - HardwareZone.com.sg
Harman Kardon Onyx Studio 8 | Portable stereo Bluetooth speaker
Harman shows off multi-room speakers and gesture-controlled headphones | TechHive
Review: Harman Kardon Citation - Son-Vidéo.com: blog
Product review: Harman Kardon Citation 500 Bluetooth speaker - Richer Sounds Blog | Richer Sounds Blog
Harman Kardon Omni+ Expands Wireless Hi-Res Audio for Whole Home Applications | audioXpress
Buy Harman Kardon Citation Tower Multi-room speaker Bluetooth, Wi-Fi Built-in Google Assistant, Wi-Fi Black | Conrad Electronic
Harman Kardon Citation - Multiroom Playback #5 | Citation brings multi-room sound experience in your home by adding more powerful speakers. Play the same music or different music in different rooms for...
Harman Kardon Citation One MKII | All-in-one smart speaker with room-filling sound
Harman Kardon OMNI+ Brings Wireless, Multi-Room True HD Audio to the Home | HARMAN