Mini M1 give out sound on 2/4 speakers via external headphone jack.

[Tharayman]

All my other devices give out sound on all 4 speakers connected to the car stereo that the jack cable goes into. What could causing the mini to muffle half of the speaker setup?

 

[Cory Cooper]

Hello and welcome.

Haven't heard of many folks using a Mac mini in a vehicle.

Are you using the same 1/8" stereo adapter/cable with the mini as other devices that work properly?
What kind of connection does the car audio have?

C