A:Answer Hi,
Thank you for your question. Based on what you have outlined, both of your Sonos amps are at capacity. I do not recommend attaching any additional speakers to either of them.
I hope you found this information helpful. If you have additional questions, please feel free to call our California-based support team at 949-492-7777 and ask for Tech Support. We are available Monday - Friday, 8 AM to 5 PM PST. We'd love to help you out.
- Sonance Tech Support Team