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Can I use my Sonos AMP with two external speakers and use my Roland 700NX keyboard as the music source? I don't want to try until I get a good answer so I don't blow the AMP up. The Roland is very powerful and may need more WATTS in a larger AMP for instance.
Not really. The line-in has a delay of 70 ms that would make it impossible to use for playing a keyboard or other instrument. If you only wanted to use it for playback of MIDI files or recordings, then it would work. You would need a line-level output from the keyboard, not amplified.