No, Sonos does not allow two Subs to be connected to a single ‘room’. 

Hi @ndis1977.

Welcome to the Sonos community and thanks for reaching out to us. I understand that you wanted to use 2 Sonos Sub with your Sonos Arc home theater system. Let me help out with that.

Currently, Sonos only supports adding 1 Sonos Sub to any home theater set up. Adding more than 1 Sonos Sub is not yet a supported setup. However, what I can do is send this up to our engineering team as a feature request as you may not be the only one having the preferre4d set up for their home theater. I would advise subscribing to this thread and to our announcement topic.

Please let us know or create a topic if you still have further questions or concerns. We are always here to help.

Thanks,