今天苹果正式发布和推送了iOS 11.4正式版系统更新，本次更新包括了“隔空播放 2”多房间音频，支持 HomePod 立体声组合以及 iCloud 云端“信息”。还包括错误修复和改进。
iOS 11.4正式版推送之后，苹果在HomeKit 网站更新了AirPlay 2 第三方音箱名单。名单如下：
·Beoplay A6
·Beoplay A9 mk2
·Beoplay M3
·BeoSound 1
·BeoSound 2
·BeoSound 35
·BeoSound Core
·BeoSound Essence mk2
·BeoVision Eclipse (audio only)
·Denon AVR-X3500H
·Denon AVR-X4500H
·Denon AVR-X6500H
·Libratone Zipp
·Libratone Zipp Mini
·Marantz AV7705
·Marantz NA6006
·Marantz NR1509
·Marantz NR1609
·Marantz SR5013
·Marantz SR6013
·Marantz SR7013
·Naim Mu-so
·Naim Mu-so QB
·Naim ND 555
·Naim ND5 XS 2
·Naim NDX 2
·Naim Uniti Nova
·Naim Uniti Atom
·Naim Uniti Star
·Sonos One
·Sonos Play:5
·Sonos Playbase
