Backwards compatibility

Backward compatibility is a plus: pairing and system integration with other Sonos gear is straightforward, and some setups allow mixing Roam generations for stereo pairing.

Backwards compatibility is supported by multiple wired options (notably optical) that allow it to work well with older TVs lacking HDMI ARC convenience.

Backward pairing behavior is reported inconsistently: some sources state pairing with Wonderboom 3 is supported, while at least one review claims stereo pairing only works with another Wonderboom 4.

Arc runs on the Sonos S2 platform and may not play nicely with some legacy Sonos hardware or older software setups, which can be a friction point for long-time Sonos households.

Can be grouped with older Sonos speakers, but cannot form a dedicated stereo pair with the original Move.

A recurring complaint is that Gen 2 cannot stereo-pair with the original Flex, which reduces upgrade appeal for existing owners.

Backwards compatibility is a common complaint: multiple reviews stress it will not pair in the usual way with older JBL speakers that rely on PartyBoost, including the Charge 5.