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I have a Sonos Amp along with a pair of Sonos by Sonance Outdoor speakers and I want to connect-add a passive GLS8 OSD Subwoofer along with a Fosi M03 mono sub amp, is this configuration possible all together in the Sonos Amp??

If the Fosi M03 accepts a line level input (from the Sonos Amp), and can feed it to the GLS8 OSD subwoofer, sure. Note that the Sub output on the Sonos Amp is turned off when the Amp is being used to drive surround speakers. If you’re not driving surround speakers, the Sub output is on, and sending a line level output. 

Thanks for the info

If its the newer generation amp (black) the sub output will work. If it's one of the older gen amps, sonos recently disabled the sub output. 

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