No, the Acton Multi-Room speaker needs to be connected to a power supply in order to function.
Yes, as long as the Turntable offers an output that corresponds to one of the speaker's inputs. Note that a pre-amp will be required. Due to the built-in audio delay (across all inputs), these speakers aren't suitable if your Turntable has its own speakers.
Yes, this speaker can be used with the Marshall Multi-Room and Google Home apps.
The Marshall Multi-Room app will support a max of 5 speakers in a group; the Google Home app has yet to set a limit for the number of speakers in their Multi-Groups.
The Marshall Multi-Room speakers can be combined with the Marshall GVA speakers in the Google Home app, but they can’t be combined with Marshall Voice with Amazon Alexa speakers.
No, the Acton Multi-Room doesn't have the aptX or AAC codecs.