Sonos Line-in adapter and iOS/macOS

@melvimbe 

No, the Apple adapter is a one way usb c to 3,5mm audio adapter as @newbpd also said. I just wanted to point out that the Sonos adapter doesn’t work bidirectional. 
 

@106rallye

@newbpd

I‘m not sure if there is any communication between the Sonos adapter and Sonos devicees that could be the reason why other adapters don’t work. I supposed so because some people told they tried a different way adapter (microphone to usb c) or a bidirectional adapter that should work both ways and it didn’t work. 
I know most adapters are one way usb c to 3,5mm audio out just to connect headphones to usb c. 
But there are a few others and if they would work the same way like the Sonos one, why  won’t they just work. Strange…

Imo then for example the following two should work…

These are both microphone inputs and not line-in inputs.

As I understand it if you try to use line-in levels with a microphone input you get distortion/clipping.

Another difference is that Microphones are mono and Line-in is stereo.

I’m just speculating here, but maybe Sonos requires a stereo input?

@newbpd

Of course you’re right about the difference between line in and microphone and the effect on using a microphone in. But the signal direction is the same so I thought it could help to figure out if there will come in a signal at all. 
I willl hold on to find that 3rd party usb c line in adapter. 😎