When you say WiFi, are you referring to the pipe into the home or the distribution of the signal wirelessly around the home? For the pipe, the only solution is to get a bigger pipe - more bandwidth - from your service provider. If it is internal around the home, wire at least one Sonos unit to the router; if that is inconvenient, buy a Boost or a Bridge and wire that to the router. Either approach will invoke the use of Sonosnet inside the house and address the issue of WiFi speed inside the home.

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