My apologies if this has already been answered (couldn’t see anything when searching though). What is the output impedance of the Port’s line output? I’d like to drive a fairly long cable (5m), so low impedance would be good..!
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It’s not declared anywhere in the spec, and I very much doubt you’d get the information from Sonos Support. The output impedance is likely to be small, especially in comparison to the input impedance of the downstream device.
A cable of 5m is not that long anyhow, but make sure it has a decent cross-sectional area and is adequately screened. I’d be more concerned about noise than any tiny voltage loss.
Ok thanks ratty 
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