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Best answer by AjTrek1
@buzz solution will work...I think 🤔. However, less hassle for balance (although you’ll have to purchase another Sonos product) you could use a Sonos Port with a RCA to ¼ inch (like this) connected to the Ports RCA out-put.
That doesn’t make sense.🤔 The Port has two types of audio output which are optical and RCA. The other RCA ports are for input from a source typically connected to a AV receiver such as a CD player or Turn Table. You should be using the RCA out to your Yamaha ¼ inch input.
If you are only getting sound to one speaker (as one feeds the other) I suspect the issue lies with the Yamaha crossover.