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I have a Sonos Amp hooked up to (2) Polk Atrium 8 speakers. They are stereo speakers with 4 input for stereo sound out of each speaker. It’s good for outdoor since they are spaced far apart. They are 8 ohms. 

I am wondering if I can a 3rd speaker on the system. It would techinically be a 3rd speaker OR a 3rd stereo setup. There would be 3 wires on each terminal. 

 

Will the amp be able to handle it?

No, the maximum resistance is 2 8 Ohm speakers per channel or 4 Ohms total (8 Ohms + 8 Ohms = 4 Ohms total) per channel.