Devialet recommend to have a Dialog in your Phantom's setup, even for a Solo setup (1 Phantom). For a multiple Phantom setup, Dialog is requiered. It means that as soon as you want to pair together 2 or more Phantom, you absolutely need dialog.
Your domestical wifi is constantly urged by services (TV, streaming, online games, internet browsing, etc...) and used by devices (Tablet, Laptop, Phone etc...). The quality of your bandwidth is therefore reduced because of this.
However the Phantom's system requiered a strong and robust wifi. That's a reason why we recommend our customer to have Dialog within their system, which will stabilize their network and will offer the requiered network to the system.
For some more information on the Dialog, please have a look at the below page:
Dialog is not requiered with Phantom Reactor.