Hi, and thank you very much for your question! When AMP is set to rear, it controls the crossover only for the left and right surround, and deactivates the sub output on the rear AMP, so unfortunately you cannot use the rear AMP with a subwoofer. Also worth noting, the front AMP can only support one subwoofer. In regards to using Fives as rears, you can use the Sonos Fives as rears if our AMP is powering the front B&Ws. However, you can only have one product set up as rears, so you could not have amp as rears and Sonos Fives as rears. It would have to be one or the other.
4 years ago
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Sonos Customer Care