If they're the same brand and not too old.... check whether that brand offers the option to connect them both at the same time using their own software or an app (
https://hdmitechnologies.com/how-to-...akers-at-once/). Otherwise, SONOS appears to be very flexible, but not very cheap. I don't have any SONOS stuff myself as my house isn't big enough.
And back on topic....
