Richard it could also be because the bluetooth amp that drives four channels does not expose/declare a control that lets you adjust front/rear?
So the smaller speakers fail to match the rear if they are different?
Just a thought.
If we can find the unit, the name and model then there is a chance that there is an App that will allow detailed setup that may assist?
Are you able to find the device type?
Exactly that yes, and doubt there are any configurables given what has been gleaned from the factory.
