I recently purchased a Marantz 7725 2 channel power amp to drive my LR mini towers. To simplify and automate the system for my wife, I intentionally chose an amp that had a 12VDC trigger input. Imagine my surprise when the Port failed to trigger the amp! Grr! I tried Sonos support and the newbie on the line didn’t even know what a trigger was, no less it’s functionality. Double grrr!

I am a retired Cedía guy, so I went to this forum to do some research, and learned that the Port’s trigger can only synch 200ma, which is pretty lame IMO. I could not find a spec on the current draw on the Marantz, but I was pretty sure I knew the solution. I bought a 12VDC SPST relay (ELK 912 that I’d been using for years) that draws 40ma from the coil. The Port triggered it open and closed as expected. I used it to close the circuit of a standard wall wart (500ma) and viola! Problem solved. 
 

Sigh…. My love/hate relationship with Sonos continues. At least I got my Music Library back (finally!!!). I was a dealer almost from inception so it’s clear to me Sonos has been ruined by success, arrogance and private equity investors.