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I’m confused about how the Sonos Amp handles line-in for a 2x Amp setup for 4.1 Surround. I have it plugged in and it works, but I don't see the source level in the new app. Customer support says that both Amps line-in are disabled, but I thought it was just the Amp that is powering the surrounds. Does the source level appear in the old app? It doesn’t appear now.

The Line-In on the Amp connected to the TV and powering the fronts is active.  The Line-In on the Amp powering the surrounds is inactive.  I can’t tell you what is missing from the current app vis Line-In, as I no longer use one.