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I have a pair of Vienna Acoustic speakers rated at 4-ohms. I'm considering switching to a Sonos Amp, but wondering if that will work given Sonos lists the amp at 8-ohms. Does this just mean it will pull more power to get the same volume or are there any issues risks here?
https://www.stereophile.com/content/sonos-zp80-zp100-wifi-music-system-sonos-bundle-250-april-2010
Yes 4-8ohms. You ca do only one pair. IF ever Neede to add more than the two you would need to get an impedance marching switch between speakers and the amp.